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Fencer Intel
low 3.1

CVE-2019-10155 json

The Libreswan Project has found a vulnerability in the processing of IKEv1 informational exchange packets which are encrypted and integrity…

published 2019-06-12 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-2191

cvss
3.1
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

The Libreswan Project has found a vulnerability in the processing of IKEv1 informational exchange packets which are encrypted and integrity protected using the established IKE SA encryption and integrity keys, but as a receiver, the integrity check value was not verified. This issue affects versions before 3.29.

Patch / fix

  • libreswan libreswan 3.29
  • strongswan strongswan 5.0.0
  • libreswan Debian 13, Debian 12 3.27-6
  • strongswan Debian 14, Debian 13, Debian 12 5.1.0-1

debian advisories DEBIAN-CVE-2019-10155

  • 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 3.29-r0

alpine advisories ALPINE-CVE-2019-10155

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-2019-10155 updated cvss 3.1

libreswan: vulnerability in the processing of IKEv1 informational packets due to missing integrity check

  • Red Hat Enterprise Linux 5 openswan Red Hat Enterprise Linux 6 openswan, libreswan Red Hat Enterprise Linux 7 libreswan
    affected: workaround, no fix planned “If all IKE peers support IKEv2, it is possible to reconfigure IKEv1 connections to use IKEv2 via the "ikev2=insist" keyword.”
  • Red Hat Enterprise Linux AppStream (v. 8) libreswan 3.29-6.el8
    fixed: vendor fix “If all IKE peers support IKEv2, it is possible to reconfigure IKEv1 connections to use IKEv2 via the "ikev2=insist" keyword.” RHSA-2019:3391

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

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 3.1 CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:N/A:P

Affected products

  • the libreswan Project libreswan

Classification

Weakness
  • CWE-354 Improper Validation of Integrity Check Value

References

Sources

Fencer Intel 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.