CVE-2023-38712

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-25 · updated 2026-06-17
Weakness: CWE-476

Description

An issue was discovered in Libreswan 3.x and 4.x before 4.12. When an IKEv1 ISAKMP SA Informational Exchange packet contains a Delete/Notify payload followed by further Notifies that act on the ISAKMP SA, such as a duplicated Delete/Notify message, a NULL pointer dereference on the deleted state causes the pluto daemon to crash and restart.

Affected products

The Libreswan Project libreswan: from 3.0 before 4.0; from 4.0 before 4.12 — fixed in 4.0, 4.12

How to fix

Upgrade to a fixed version: The Libreswan Project libreswan 4.0, 4.12. Check the vendor advisory for mitigations.

References

https://github.com/libreswan/libreswan/tags
https://libreswan.org/security/CVE-2023-38712/
https://github.com/libreswan/libreswan/tags
https://libreswan.org/security/CVE-2023-38712/

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