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Vulnerability record · CVE-2019-12312 · published 24 May 2019

CVE-2019-12312: Libreswan null pointer dereference vulnerability

Libreswan · Libreswan

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.

7.5 CVSS 3.0 High EPSS 2.7% · top 14.4% CWE-476 · NULL pointer dereferenceCWE-617 · CWE-617
7.5CVSS 3.0 base score, v2 5.0
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.iwantacve.cn/index.php/archives/218/ ExploitThird Party Advisory
https://github.com/libreswan/libreswan/compare/9b1394e...3897683 PatchThird Party Advisory
https://github.com/libreswan/libreswan/issues/246 Third 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/ ExploitThird Party Advisory
https://github.com/libreswan/libreswan/compare/9b1394e...3897683 PatchThird Party Advisory
https://github.com/libreswan/libreswan/issues/246 Third 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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-12312), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.