CVE-2024-3652: IKEv1 default AH/ESP responder can cause libreswan to abort and restart
Vulnerability summary
CVE-2024-3652 is a medium (CVSS 6.5) Improper Resource Shutdown or Release vulnerability in libreswan. EPSS estimates a 0.80% chance of exploitation in the next 30 days, higher than 56.6% of scored vulnerabilities.
Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 3Timeline
- 11-04-2024PublishedVulnerability first disclosed.
- 27-02-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
6 scores · 6 sources · 1 version- OSV · Red hatEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · AlpineEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.80%
Chance of exploitation in the next 30 days
Percentile
57%
Versus all other CVEs
30-day change
Increase +0.01 pp
From 0.79% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat3 products
- libreswan< 0:4.12-2.el9_4.1 | < 0:4.9-3.el8_8.2 | < 0:4.12-2.el8_10.4 | < 0:4.6-3.el9_0.2 | < 0:4.5-1.el8_6.3 | < 0:4.9-5.el9_2.2
- libreswan-debuginfo< 0:4.12-2.el9_4.1 | < 0:4.9-3.el8_8.2 | < 0:4.12-2.el8_10.4 | < 0:4.6-3.el9_0.2 | < 0:4.5-1.el8_6.3 | < 0:4.9-5.el9_2.2
- libreswan-debugsource< 0:4.12-2.el9_4.1 | < 0:4.9-3.el8_8.2 | < 0:4.12-2.el8_10.4 | < 0:4.6-3.el9_0.2 | < 0:4.5-1.el8_6.3 | < 0:4.9-5.el9_2.2
Alpine1 product
- libreswan≥ 3.22, < 4.15-r0
Debian1 product
- libreswanAll versions (No fix recorded) | < 4.15-1
Libreswan1 product
- libreswan≥ 3.22, < 4.15
Mageia1 product
- libreswan< 4.15-1.mga9
The libreswan project (www.libreswan.org)1 product
- libreswan≥ 3.22, ≤ 4.14
Ubuntu1 product
- libreswanAll versions (No fix recorded)
7 vendors · 9 products
References
24 links- www.openwall.com/lists/oss-security/2024/04/18/2Mailing List
