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Fencer Vulns
high 7.5

CVE-2019-12312 json

In Libreswan 3.27 an assertion failure can lead to a pluto IKE daemon restart.

published 2019-05-24 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3949

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

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.

Patch / fix

  • libreswan libreswan 3.28
  • libreswan Debian 13, Debian 12 3.27-5

debian advisories DEBIAN-CVE-2019-12312

  • libreswan RHEL 8 3.29-6.el8

red hat advisories RHSA-2019:3391

  • libreswan Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 3.28-r0

alpine advisories ALPINE-CVE-2019-12312

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-12312 updated cvss 4.3

libreswan: null-pointer dereference by sending two IKEv2 packets

  • Red Hat Enterprise Linux AppStream (v. 8) libreswan 3.29-6.el8
    fixed: vendor fix RHSA-2019:3391
  • Red Hat Enterprise Linux 5 openswan Red Hat Enterprise Linux 6 openswan, libreswan Red Hat Enterprise Linux 7 libreswan
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.75% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • iwantacve.cn http://www.iwantacve.cn/index.php/archives/218/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.