NULL Pointer Dereference Affecting libreswan package, versions <3.28-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ALPINE324-LIBRESWAN-17300934
- published11 Jun 2026
- disclosed24 May 2019
Introduced: 24 May 2019
CVE-2019-12312 (opens in a new tab)How to fix?
Upgrade Alpine:3.24 libreswan to version 3.28-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libreswan package and not the libreswan package as distributed by Alpine.
See How to fix? for Alpine:3.24 relevant fixed versions and status.
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.
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12312
- 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
- https://security-tracker.debian.org/tracker/CVE-2019-12312
- https://github.com/libreswan/libreswan/compare/9b1394e...3897683
- https://github.com/libreswan/libreswan/issues/246
- http://www.iwantacve.cn/index.php/archives/218/