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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-38712
• https://github.com/libreswan/libreswan/tags
• https://libreswan.org/security/CVE-2023-38712/