CVE-2019-12312

In Libreswan 3.27 an assertion failure can lead to a pluto IKE daemon restart. An attacker can trigger a NULL pointer dereference by initiating an IKEv2 IKE_SA_INIT exchange, followed by a bogus INFORMATIONAL exchange instead of the normallly expected IKE_AUTH exchange. This affects send_v2N_spi_response_from_state() in programs/pluto/ikev2_send.c that will then trigger a NULL pointer dereference leading to a restart of libreswan.

• CWE-476
• CWE-617

• http://www.iwantacve.cn/index.php/archives/218/Exploit, Third Party Advisory
• https://github.com/libreswan/libreswan/compare/9b1394e...3897683Patch, Third Party Advisory
• https://github.com/libreswan/libreswan/issues/246Third Party Advisory
• https://libreswan.org/security/CVE-2019-12312/CVE-2019-12312.txt
• https://libreswan.org/security/CVE-2019-12312/libreswan-3.27-CVE-2019-12312.patch
• http://www.iwantacve.cn/index.php/archives/218/Exploit, Third Party Advisory
• https://github.com/libreswan/libreswan/compare/9b1394e...3897683Patch, Third Party Advisory
• https://github.com/libreswan/libreswan/issues/246Third Party Advisory
• https://libreswan.org/security/CVE-2019-12312/CVE-2019-12312.txt
• https://libreswan.org/security/CVE-2019-12312/libreswan-3.27-CVE-2019-12312.patch

Published

May 24, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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