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Fencer Vulns
medium 6.5

CVE-2023-38711 json

An issue was discovered in Libreswan before 4.12.

published 2023-08-25 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-42486

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

An issue was discovered in Libreswan before 4.12. When an IKEv1 Quick Mode connection configured with ID_IPV4_ADDR or ID_IPV6_ADDR receives an IDcr payload with ID_FQDN, a NULL pointer dereference causes a crash and restart of the pluto daemon. NOTE: the earliest affected version is 4.6.

Patch / fix

  • libreswan libreswan 4.12
  • libreswan Debian 13 4.12-1

debian advisories DEBIAN-CVE-2023-38711

  • libreswan openshift 4.17, openshift 4.16, openshift 4.15 +1 more 4.6-3.el9_0.3
  • libreswan RHEL 8 4.12-2.el8
  • libreswan RHEL 9 4.12-1.el9
  • libreswan RHEL 9.2 EUS 4.9-5.el9_2.4

red hat advisories RHSA-2025:0309RHBA-2024:11565RHBA-2024:11505RHBA-2024:11525RHSA-2024:10594RHSA-2023:7052

  • libreswan AlmaLinux 8 4.12-2.el8
  • libreswan AlmaLinux 9 4.12-1.el9

almalinux advisories ALSA-2023:7052ALSA-2023:6549

  • libreswan Rocky Linux 8 4.12-2.el8_10.3

rocky linux advisories RLSA-2023:7052

  • libreswan Alpine 3.24, Alpine 3.23, Alpine 3.22 +3 more 4.12-r0

alpine advisories ALPINE-CVE-2023-38711

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

  • libreswan CBL-Mariner 2.0 4.7-5
  • libreswan Azure Linux 3.0 4.7-6

azure linux advisories AZL-28065AZL-34936

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2023-38711 updated cvss 6.5

libreswan: Invalid IKEv1 Quick Mode ID causes restart

  • Red Hat Enterprise Linux AppStream (v. 8) libreswan 4.12-2.el8
    fixed: vendor fix RHSA-2023:7052
  • Red Hat Enterprise Linux AppStream (v. 9) libreswan 4.12-1.el9
    fixed: vendor fix RHSA-2023:6549
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) libreswan 4.6-3.el9_0.3
    fixed: vendor fix RHSA-2024:10594
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) libreswan 4.9-5.el9_2.4
    fixed: vendor fix RHSA-2025:0309
  • Red Hat OpenShift Container Platform 4.15 libreswan 4.6-3.el9_0.3
    fixed: vendor fix RHBA-2024:11565
  • Red Hat OpenShift Container Platform 4.16 libreswan 4.6-3.el9_0.3
    fixed: vendor fix RHBA-2024:11505
  • Red Hat OpenShift Container Platform 4.17 libreswan 4.6-3.el9_0.3
    fixed: vendor fix RHBA-2024:11525
  • Red Hat Enterprise Linux 6 libreswan Red Hat Enterprise Linux 7 libreswan Red Hat OpenShift Container Platform 4.17 openshift 4.17.0-202412172334.p0.gf868289.assembly.stream.el8, openshift 4.17.0-202412172334.p0.gf868289.assembly.stream.el9, openshift-kubelet 4.17.0-202412172334.p0.gf868289.assembly.stream.el8, openshift-kubelet 4.17.0-202412172334.p0.gf868289.assembly.stream.el9, openshift-hyperkube 4.17.0-202412172334.p0.gf868289.assembly.stream.el8, openshift-hyperkube 4.17.0-202412172334.p0.gf868289.assembly.stream.el9, +6 more
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.81% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.