Skip to main content
MEDIUM

CVE-2023-23009

CVSS v3

6.5

MEDIUM

EPSS Score

1.6 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for libreswan.

Set up CVE WatchFree account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libreswanAlmaLinux:9all versions · fixed in 4.9-2.el9_2
  • libreswanAlmaLinux:8all versions · fixed in 4.9-2.el8_8.2

Vendor advisories

  • CVE-2023-23009 Red Hat Product Security78 products fixed

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

  • RHBA-2024:11525 Red Hat Product Security13 products fixed

    Red Hat Bug Fix Advisory: OpenShift Container Platform 4.17.10 packages and security update

  • RHBA-2024:11505 Red Hat Product Security13 products fixed

    Red Hat Bug Fix Advisory: OpenShift Container Platform 4.16.28 packages and security update

  • RHBA-2024:11565 Red Hat Product Security13 products fixed

    Red Hat Bug Fix Advisory: OpenShift Container Platform 4.15.42 packages update

  • RHSA-2024:10594 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: libreswan security update

  • RHSA-2023:3095 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: libreswan security and bug fix update

1 more advisory

Full record on NVD

Description

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.

Technical details

Published
2023-02-21

Frequently asked questions

What is CVE-2023-23009?

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.

Is CVE-2023-23009 actively exploited?

Active exploitation of CVE-2023-23009 has not been confirmed. Its EPSS score was 1.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-23009?

CVE-2023-23009 has a CVSS v3 base score of 6.5 (MEDIUM severity).

Running libreswan? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this productCISA KEV additions, October 2026Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database