CVE-2026-20182 (GCVE-0-2026-20182)
Vulnerability from cvelistv5 – Published: 2026-05-14 16:08 – Updated: 2026-06-16 17:57
VLAI?
Title
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Summary
May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks.
A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.
This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to the affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.
Severity ?
10 (Critical)
CWE
- CWE-287 - Improper Authentication
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Catalyst SD-WAN Controller |
Affected:
20.6.4
Affected: 20.9.2 Affected: 20.3.6 Affected: 20.7.2 Affected: 20.7.1 Affected: 20.5.1 Affected: 20.6.2 Affected: 19.3.0 Affected: 20.6.1 Affected: 17.2.4 Affected: 18.2.0 Affected: 18.4.6 Affected: 19.1.0 Affected: 19.2.4 Affected: 19.2.929 Affected: 18.3.8 Affected: 18.4.303 Affected: 18.3.7 Affected: 18.4.1 Affected: 19.2.097 Affected: 19.2.0 Affected: 19.2.099 Affected: 18.3.6 Affected: 20.4.2 Affected: 19.0.0 Affected: 20.9.1 Affected: 20.3.5 Affected: 20.3.1 Affected: 18.3.5 Affected: 20.6.3 Affected: 18.4.3 Affected: 18.4.4 Affected: 18.3.3 Affected: 17.2.8 Affected: 20.8.1 Affected: 19.2.32 Affected: 19.2.2 Affected: 17.2.5 Affected: 18.4.0 Affected: 20.4.1.1 Affected: 20.1.3 Affected: 20.1.2 Affected: 17.2.10 Affected: 19.2.098 Affected: 20.1.1 Affected: 17.2.6 Affected: 19.2.1 Affected: 18.3.4 Affected: 20.4.1 Affected: 17.2.9 Affected: 19.2.31 Affected: 19.0.1a Affected: 18.3.0 Affected: 17.2.7 Affected: 18.4.5 Affected: 20.3.4 Affected: 20.3.3 Affected: 20.4.1.2 Affected: 20.3.2 Affected: 18.3.1 Affected: 20.1.12 Affected: 19.2.3 Affected: 20.10.1 Affected: 20.6.5 Affected: 20.3.7 Affected: 20.9.3 Affected: 20.11.1 Affected: 20.6.3.2 Affected: 20.4.2.3 Affected: 20.3.5.1 Affected: 20.3.4.3 Affected: 20.9.3.1 Affected: 20.6.4.1 Affected: 20.3.3.2 Affected: 20.6.5.2 Affected: 20.3.7.1 Affected: 20.11.1.1 Affected: 20.10.1.1 Affected: 20.6.1.2 Affected: 20.1.3.1 Affected: 20.9.2.2 Affected: 20.6.5.3 Affected: 20.6.3.3 Affected: 20.3.7.2 Affected: 20.6.5.4 Affected: 20.9.2.3 Affected: 20.9.4 Affected: 20.12.1 Affected: 20.3.8 Affected: 20.6.6 Affected: 20.12.2 Affected: 20.13.1 Affected: 20.9.5 Affected: 20.12.3 Affected: 20.6.7 Affected: 20.9.5.1 Affected: 20.14.1 Affected: 20.12.3.1 Affected: 20.12.4 Affected: 20.15.1 Affected: 20.9.6 Affected: 20.6.8 Affected: 20.16.1 Affected: 20.9.5.3 Affected: 20.12.4.1 Affected: 20.15.2 Affected: 20.12.5 Affected: 20.9.7 Affected: 20.15.3 Affected: 20.12.5.1 Affected: 20.12.5.2 Affected: 20.15.4 Affected: 20.9.7.1 Affected: 20.12.6 Affected: 20.9.8 Affected: 20.15.4.1 Affected: 20.15.4.2 Affected: 20.12.5.3 Affected: 20.12.6.1 Affected: 20.9.8.2 Affected: 20.15.5 Affected: 20.12.7 Affected: 20.9.9 Affected: 20.15.5.1 Affected: 20.15.4.3 Affected: 20.15.4.5 Affected: 20.15.5.3 Affected: 20.12.7.2 Affected: 20.9.9.2 |
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"notes": "CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW ; https://nvd.nist.gov/vuln/detail/CVE-2026-20182",
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"shortDescription": "Cisco Catalyst SD-WAN Controller \u0026 Manager contain an authentication bypass vulnerability that allows an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.",
"vendorProject": "Cisco",
"vulnerabilityName": "Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20182\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-14T17:08:17.868537Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2026-05-14\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182\"}}}], \"references\": [{\"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20182\", \"tags\": [\"government-resource\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-14T17:41:18.017Z\"}, \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-05-14T00:00:00.000Z\", \"value\": \"CVE-2026-20182 added to CISA KEV\"}]}], \"cna\": {\"title\": \"Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability\", \"source\": {\"defects\": [\"CSCwt50498\"], \"advisory\": \"cisco-sa-sdwan-rpa2-v69WY2SW\", \"discovery\": \"EXTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 10, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco Catalyst SD-WAN Controller\", \"versions\": [{\"status\": \"affected\", \"version\": \"20.6.4\"}, {\"status\": \"affected\", \"version\": \"20.9.2\"}, {\"status\": \"affected\", \"version\": \"20.3.6\"}, {\"status\": \"affected\", \"version\": \"20.7.2\"}, {\"status\": \"affected\", \"version\": \"20.7.1\"}, {\"status\": \"affected\", \"version\": \"20.5.1\"}, {\"status\": \"affected\", \"version\": \"20.6.2\"}, {\"status\": \"affected\", \"version\": \"19.3.0\"}, {\"status\": \"affected\", \"version\": \"20.6.1\"}, {\"status\": \"affected\", \"version\": \"17.2.4\"}, {\"status\": \"affected\", \"version\": \"18.2.0\"}, {\"status\": \"affected\", \"version\": \"18.4.6\"}, {\"status\": \"affected\", \"version\": \"19.1.0\"}, {\"status\": \"affected\", \"version\": \"19.2.4\"}, {\"status\": \"affected\", \"version\": \"19.2.929\"}, {\"status\": \"affected\", \"version\": \"18.3.8\"}, {\"status\": \"affected\", \"version\": \"18.4.303\"}, {\"status\": \"affected\", \"version\": \"18.3.7\"}, {\"status\": \"affected\", \"version\": \"18.4.1\"}, {\"status\": \"affected\", \"version\": \"19.2.097\"}, {\"status\": \"affected\", \"version\": \"19.2.0\"}, {\"status\": \"affected\", \"version\": \"19.2.099\"}, {\"status\": \"affected\", \"version\": \"18.3.6\"}, {\"status\": \"affected\", \"version\": \"20.4.2\"}, {\"status\": \"affected\", \"version\": \"19.0.0\"}, {\"status\": \"affected\", \"version\": \"20.9.1\"}, {\"status\": \"affected\", \"version\": \"20.3.5\"}, {\"status\": \"affected\", \"version\": \"20.3.1\"}, {\"status\": \"affected\", \"version\": \"18.3.5\"}, {\"status\": \"affected\", \"version\": \"20.6.3\"}, {\"status\": \"affected\", \"version\": \"18.4.3\"}, {\"status\": \"affected\", \"version\": \"18.4.4\"}, {\"status\": \"affected\", \"version\": \"18.3.3\"}, {\"status\": \"affected\", \"version\": \"17.2.8\"}, {\"status\": \"affected\", \"version\": \"20.8.1\"}, {\"status\": \"affected\", \"version\": \"19.2.32\"}, {\"status\": \"affected\", \"version\": \"19.2.2\"}, {\"status\": \"affected\", \"version\": \"17.2.5\"}, {\"status\": \"affected\", \"version\": \"18.4.0\"}, {\"status\": \"affected\", \"version\": \"20.4.1.1\"}, {\"status\": \"affected\", \"version\": \"20.1.3\"}, {\"status\": \"affected\", \"version\": \"20.1.2\"}, {\"status\": \"affected\", \"version\": \"17.2.10\"}, {\"status\": \"affected\", \"version\": \"19.2.098\"}, {\"status\": \"affected\", \"version\": \"20.1.1\"}, {\"status\": \"affected\", \"version\": \"17.2.6\"}, {\"status\": \"affected\", \"version\": \"19.2.1\"}, {\"status\": \"affected\", \"version\": \"18.3.4\"}, {\"status\": \"affected\", \"version\": \"20.4.1\"}, {\"status\": \"affected\", \"version\": \"17.2.9\"}, {\"status\": \"affected\", \"version\": \"19.2.31\"}, {\"status\": \"affected\", \"version\": \"19.0.1a\"}, {\"status\": \"affected\", \"version\": \"18.3.0\"}, {\"status\": \"affected\", \"version\": \"17.2.7\"}, {\"status\": \"affected\", \"version\": \"18.4.5\"}, {\"status\": \"affected\", \"version\": \"20.3.4\"}, {\"status\": \"affected\", \"version\": \"20.3.3\"}, {\"status\": \"affected\", \"version\": \"20.4.1.2\"}, {\"status\": \"affected\", \"version\": \"20.3.2\"}, {\"status\": \"affected\", \"version\": \"18.3.1\"}, {\"status\": \"affected\", \"version\": \"20.1.12\"}, {\"status\": \"affected\", \"version\": \"19.2.3\"}, {\"status\": \"affected\", \"version\": \"20.10.1\"}, {\"status\": \"affected\", \"version\": \"20.6.5\"}, {\"status\": \"affected\", \"version\": \"20.3.7\"}, {\"status\": \"affected\", \"version\": \"20.9.3\"}, {\"status\": \"affected\", \"version\": \"20.11.1\"}, {\"status\": \"affected\", \"version\": \"20.6.3.2\"}, {\"status\": \"affected\", \"version\": \"20.4.2.3\"}, {\"status\": \"affected\", \"version\": \"20.3.5.1\"}, {\"status\": \"affected\", \"version\": \"20.3.4.3\"}, {\"status\": \"affected\", \"version\": \"20.9.3.1\"}, {\"status\": \"affected\", \"version\": \"20.6.4.1\"}, {\"status\": \"affected\", \"version\": \"20.3.3.2\"}, {\"status\": \"affected\", \"version\": \"20.6.5.2\"}, {\"status\": \"affected\", \"version\": \"20.3.7.1\"}, {\"status\": \"affected\", \"version\": \"20.11.1.1\"}, {\"status\": \"affected\", \"version\": \"20.10.1.1\"}, {\"status\": \"affected\", \"version\": \"20.6.1.2\"}, {\"status\": \"affected\", \"version\": \"20.1.3.1\"}, {\"status\": \"affected\", \"version\": \"20.9.2.2\"}, {\"status\": \"affected\", \"version\": \"20.6.5.3\"}, {\"status\": \"affected\", \"version\": \"20.6.3.3\"}, {\"status\": \"affected\", \"version\": \"20.3.7.2\"}, {\"status\": \"affected\", \"version\": \"20.6.5.4\"}, {\"status\": \"affected\", \"version\": \"20.9.2.3\"}, {\"status\": \"affected\", \"version\": \"20.9.4\"}, {\"status\": \"affected\", \"version\": \"20.12.1\"}, {\"status\": \"affected\", \"version\": \"20.3.8\"}, {\"status\": \"affected\", \"version\": \"20.6.6\"}, {\"status\": \"affected\", \"version\": \"20.12.2\"}, {\"status\": \"affected\", \"version\": \"20.13.1\"}, {\"status\": \"affected\", \"version\": \"20.9.5\"}, {\"status\": \"affected\", \"version\": \"20.12.3\"}, {\"status\": \"affected\", \"version\": \"20.6.7\"}, {\"status\": \"affected\", \"version\": \"20.9.5.1\"}, {\"status\": \"affected\", \"version\": \"20.14.1\"}, {\"status\": \"affected\", \"version\": \"20.12.3.1\"}, {\"status\": \"affected\", \"version\": \"20.12.4\"}, {\"status\": \"affected\", \"version\": \"20.15.1\"}, {\"status\": \"affected\", \"version\": \"20.9.6\"}, {\"status\": \"affected\", \"version\": \"20.6.8\"}, {\"status\": \"affected\", \"version\": \"20.16.1\"}, {\"status\": \"affected\", \"version\": \"20.9.5.3\"}, {\"status\": \"affected\", \"version\": \"20.12.4.1\"}, {\"status\": \"affected\", \"version\": \"20.15.2\"}, {\"status\": \"affected\", \"version\": \"20.12.5\"}, {\"status\": \"affected\", \"version\": \"20.9.7\"}, {\"status\": \"affected\", \"version\": \"20.15.3\"}, {\"status\": \"affected\", \"version\": \"20.12.5.1\"}, {\"status\": \"affected\", \"version\": \"20.12.5.2\"}, {\"status\": \"affected\", \"version\": \"20.15.4\"}, {\"status\": \"affected\", \"version\": \"20.9.7.1\"}, {\"status\": \"affected\", \"version\": \"20.12.6\"}, {\"status\": \"affected\", \"version\": \"20.9.8\"}, {\"status\": \"affected\", \"version\": \"20.15.4.1\"}, {\"status\": \"affected\", \"version\": \"20.15.4.2\"}, {\"status\": \"affected\", \"version\": \"20.12.5.3\"}, {\"status\": \"affected\", \"version\": \"20.12.6.1\"}, {\"status\": \"affected\", \"version\": \"20.9.8.2\"}, {\"status\": \"affected\", \"version\": \"20.15.5\"}, {\"status\": \"affected\", \"version\": \"20.12.7\"}, {\"status\": \"affected\", \"version\": \"20.9.9\"}, {\"status\": \"affected\", \"version\": \"20.15.5.1\"}, {\"status\": \"affected\", \"version\": \"20.15.4.3\"}, {\"status\": \"affected\", \"version\": \"20.15.4.5\"}, {\"status\": \"affected\", \"version\": \"20.15.5.3\"}, {\"status\": \"affected\", \"version\": \"20.12.7.2\"}, {\"status\": \"affected\", \"version\": \"20.9.9.2\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Cisco\", \"product\": \"Cisco Catalyst SD-WAN Manager\", \"versions\": [{\"status\": \"affected\", \"version\": \"20.1.12\"}, {\"status\": \"affected\", \"version\": \"19.2.1\"}, {\"status\": \"affected\", \"version\": \"18.4.4\"}, {\"status\": \"affected\", \"version\": \"18.4.5\"}, {\"status\": \"affected\", \"version\": \"20.1.1.1\"}, {\"status\": \"affected\", \"version\": \"20.1.1\"}, {\"status\": \"affected\", \"version\": \"19.2.099\"}, {\"status\": \"affected\", \"version\": \"18.3.6\"}, {\"status\": \"affected\", \"version\": \"18.3.7\"}, {\"status\": \"affected\", \"version\": \"19.2.0\"}, {\"status\": \"affected\", \"version\": \"19.1.0\"}, {\"status\": \"affected\", \"version\": \"18.4.303\"}, {\"status\": \"affected\", \"version\": \"19.2.098\"}, {\"status\": \"affected\", \"version\": \"18.3.6.1\"}, {\"status\": \"affected\", \"version\": \"18.2.0\"}, {\"status\": \"affected\", \"version\": \"17.2.8\"}, {\"status\": \"affected\", \"version\": \"18.3.3.1\"}, {\"status\": \"affected\", \"version\": \"18.4.0\"}, {\"status\": \"affected\", \"version\": \"18.3.1\"}, {\"status\": \"affected\", \"version\": \"17.2.6\"}, {\"status\": \"affected\", \"version\": \"17.2.9\"}, {\"status\": \"affected\", \"version\": \"17.2.5\"}, {\"status\": \"affected\", \"version\": \"18.4.0.1\"}, {\"status\": \"affected\", \"version\": \"18.3.3\"}, {\"status\": \"affected\", \"version\": \"18.3.0\"}, {\"status\": \"affected\", \"version\": \"19.2.3\"}, {\"status\": \"affected\", \"version\": \"18.4.501_ES\"}, {\"status\": \"affected\", \"version\": \"20.1.2\"}, {\"status\": \"affected\", \"version\": \"19.2.929\"}, {\"status\": \"affected\", \"version\": \"19.2.31\"}, {\"status\": \"affected\", \"version\": \"20.3.2\"}, {\"status\": \"affected\", \"version\": \"19.2.4\"}, {\"status\": \"affected\", \"version\": \"19.2.4.0.9\"}, {\"status\": \"affected\", \"version\": \"20.1.3.1\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"In May 2026, the Cisco Product Security Incident Response Team (PSIRT) became aware of limited exploitation of this vulnerability. Cisco strongly recommends that customers upgrade to a fixed software release to remediate this vulnerability.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa2-v69WY2SW\", \"name\": \"cisco-sa-sdwan-rpa2-v69WY2SW\"}, {\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk\", \"name\": \"Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability\u003c/a\u003e was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The \u003ca href=\\\"#IOC\\\"\u003eIndicators of Compromise\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and fixed after the was disclosed in February 2026. This new advisory is for a new vulnerability in the control connection handshaking. The section of this advisory includes Show Control Connections guidance to help with system checks.\u0026nbsp;\\r\\n\\r\\nA vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.\\r\\nThis vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to the affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-287\", \"description\": \"Improper Authentication\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-06-16T17:57:59.048Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20182\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-16T17:57:59.048Z\", \"dateReserved\": \"2025-10-08T11:59:15.393Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-05-14T16:08:25.566Z\", \"assignerShortName\": \"cisco\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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