CVE-2023-38711

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 before 4.12. When an IKEv1 Quick Mode connection configured with ID_IPV4_ADDR or ID_IPV6_ADDR receives an IDcr payload with ID_FQDN, a NULL pointer dereference causes a crash and restart of the pluto daemon. NOTE: the earliest affected version is 4.6.

Affected products

The Libreswan Project libreswan: from 4.6 before 4.12 — fixed in 4.12

How to fix

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

References

https://github.com/libreswan/libreswan/tags
https://libreswan.org/security/CVE-2023-38711/
https://github.com/libreswan/libreswan/tags
https://libreswan.org/security/CVE-2023-38711/

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