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Fencer Vulns
medium 6.5

CVE-2023-23009 json

Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and daemon restart) via crafted TS payload with an incor…

published 2023-02-21 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-27109

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and daemon restart) via crafted TS payload with an incorrect selector length.

Patch / fix

  • libreswan Debian 13, Debian 12 4.9-2

debian advisories DEBIAN-CVE-2023-23009

  • libreswan openshift 4.17, openshift 4.16, openshift 4.15 +1 more 4.6-3.el9_0.3
  • libreswan RHEL 8 4.9-2.el8_8.2
  • libreswan RHEL 9 4.9-2.el9_2

red hat advisories RHBA-2024:11565RHBA-2024:11505RHBA-2024:11525RHSA-2024:10594RHSA-2023:3095RHSA-2023:2633

  • libreswan AlmaLinux 8 4.9-2.el8_8.2
  • libreswan AlmaLinux 9 4.9-2.el9_2

almalinux advisories ALSA-2023:3095ALSA-2023:2633

  • libreswan Alpine 3.17 4.9-r1

alpine advisories ALPINE-CVE-2023-23009

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-2023-23009 updated cvss 6.5

libreswan: remote DoS via crafted TS payload with an incorrect selector length

  • Red Hat Enterprise Linux AppStream (v. 8) libreswan 4.9-2.el8_8.2
    fixed: vendor fix RHSA-2023:3095
  • Red Hat Enterprise Linux AppStream (v. 9) libreswan 4.9-2.el9_2
    fixed: vendor fix RHSA-2023:2633
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) libreswan 4.6-3.el9_0.3
    fixed: vendor fix RHSA-2024:10594
  • 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 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
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

1.61% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/libreswan/libreswan/issues/954 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 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
  • CWE-400 Uncontrolled Resource Consumption

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.