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5 vulnerabilities
CVE-2026-50721 (GCVE-0-2026-50721)
Vulnerability from cvelistv5 – Published: 2026-07-02 21:44 – Updated: 2026-07-02 21:44
VLAI?
Title
IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload
Summary
Libreswan, via the function RSA_authenticate_hash_signature_raw_rsa(), did not correctly verify the length of the authentication hash when the SIG payload of an IKEv1 packet was encoded using PKCS #1 RSA Encryption as per RFC 2313. A remote attacker can use a variation on the Bleichenbacher attack to forge the SIG payload when small public exponents are being used (e.g., e=3), which could lead to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the SIG payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of remote IKE peers are not affected.
Severity ?
7.5 (High)
8.1 (High)
Assigner
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
0 , ≤ 5.3
(semver)
Unaffected: 5.3.1 (semver) |
Credits
Yeonghyeon Choi
Duyeong Kim
Andrew Cagney (The Libreswan Team)
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CVE-2026-50722 (GCVE-0-2026-50722)
Vulnerability from cvelistv5 – Published: 2026-07-02 21:34 – Updated: 2026-07-02 21:34
VLAI?
Title
IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload
Summary
Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected.
Severity ?
7.5 (High)
8.1 (High)
Assigner
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
0 , ≤ 5.3
(semver)
Unaffected: 5.3.1 (semver) |
Credits
Yeonghyeon Choi
Duyeong Kim
Andrew Cagney (The Libreswan Team)
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CVE-2026-12413 (GCVE-0-2026-12413)
Vulnerability from cvelistv5 – Published: 2026-07-02 21:19 – Updated: 2026-07-02 21:19
VLAI?
Title
IKEv2 Denial of Service via malformed fragmentation
Summary
An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. Continued exploitation would cause a denial of service. The function reassemble_v2_incoming_fragments() would ignore unknown outer payloads but still store these in a fixed size array msg_digest.digest[PAYLIMIT]. An off-by-one error in the assertion PASSERT(logger, md->digest_roof < elemsof(md->digest)) causes the daemon to abort. No remote code execution is possible. Any configuration that allows IKEv2 connections that do not set fragmentation=no are vulnerable. IKEv1 is not affected.
Severity ?
7.5 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
4.6 , ≤ 5.3
(semver)
Unaffected: 5.3.1 (semver) |
Credits
Hu Xinyao
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CVE-2024-3652 (GCVE-0-2024-3652)
Vulnerability from cvelistv5 – Published: 2024-04-11 01:32 – Updated: 2026-02-27 15:19
VLAI?
Title
IKEv1 default AH/ESP responder can cause libreswan to abort and restart
Summary
The Libreswan Project was notified of an issue causing libreswan to restart when using IKEv1 without specifying an esp= line. When the peer requests AES-GMAC, libreswan's default proposal handler causes an assertion failure and crashes and restarts. IKEv2 connections are not affected.
Severity ?
6.5 (Medium)
CWE
- IKEv1 with default AH/ESP configuration can cause libreswan to abort and restart
Assigner
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| The Libreswan Project (www.libreswan.org) | libreswan |
Affected:
3.22 , ≤ 4.14
(semver)
Unaffected: 5.0 |
Credits
github user X1AOxiang
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CVE-2024-2357 (GCVE-0-2024-2357)
Vulnerability from cvelistv5 – Published: 2024-03-11 19:39 – Updated: 2025-02-13 17:39
VLAI?
Title
IKEv2 misconfiguration can cause libreswan to abort and restart
Summary
The Libreswan Project was notified of an issue causing libreswan to restart under some IKEv2 retransmit scenarios when a connection is configured to use PreSharedKeys (authby=secret) and the connection cannot find a matching configured secret. When such a connection is automatically added on startup using the auto= keyword, it can cause repeated crashes leading to a Denial of Service.
Severity ?
6.5 (Medium)
CWE
- IKEv2 misconfiguration can cause libreswan to abort and restart
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| The Libreswan Project (www.libreswan.org) | libreswan |
Unaffected:
3.0 , ≤ 4.1
(semver)
Affected: 4.2 , ≤ 4.12 (semver) Unaffected: 5.0 |
Credits
Andrew Vaughn
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