CVE-2024-3652: The Libreswan Project was notified of an issue causing libreswan to restart when using IKEv1 without specifyin

Routine

MEDIUM 6.5UPGRADE

CVE-2024-3652 is a medium-severity flaw (CVSS 6.5) affecting libreswan. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-404
Published	2024-04-11
Last modified	2026-06-17

Publisher (CNA): Libreswan Project · Vendor: libreswan

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-04-11 02:15 UTCPublished CVE record published
2026-06-17 07:44 UTCUpdated Record last modified

libreswan libreswan UPGRADE

Affected: >= 3.22 and < 4.15

Fixed in: 4.15

Safe to downgrade to: a release before 3.22

1. Check installed version

apt-cache policy libreswan || rpm -q libreswan || libreswan --version

2. UPGRADE to 4.15 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libreswan

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libreswan

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.22 (Debian / Ubuntu)

apt-cache madison libreswan sudo apt install libreswan=<VERSION_BEFORE_3.22> sudo apt-mark hold libreswan

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libreswan sudo dnf downgrade libreswan-<VERSION_BEFORE_3.22> sudo dnf versionlock add libreswan

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-3652?

libreswan: upgrade to 4.15. Exact commands for each OS are on this page.

Is CVE-2024-3652 being exploited?

CVE-2024-3652 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-3652 affect?

CVE-2024-3652 affects libreswan. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2024-3652?

Priority 37/100. No elevated risk signals yet.

Related CVEs

CVE-2026-12413 HIGH 7.5 UPGRADE An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart
CVE-2026-50721 HIGH 8.1 UPGRADE Libreswan, via the function RSA_authenticate_hash_signature_raw_rsa(), did not correctly verify the length of
CVE-2026-50722 HIGH 8.1 UPGRADE Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER
CVE-2023-38712 MEDIUM 6.5 UPGRADE An issue was discovered in Libreswan 3.x and 4.x before 4.12
CVE-2023-38711 MEDIUM 6.5 UPGRADE An issue was discovered in Libreswan before 4.12

References

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