Libreswan 4.9 allows remote attackers to cause a denial of service (assert failure and…
Priority MEDIUM 62CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-400.
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01606 76th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 3 advisories
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libreswan:libreswan:4.9:*:*:*:*:*:*:* | 4.9 | Vulnerable | The Libreswan Project |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:a:libreswan:libreswan:4.9:*:*:*:*:*:*:* Versions 4.9 Vulnerable ·The Libreswan Project
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
Red Hat 3 advisories
- RHSA-2024:10594 Released 2024-12-02 · Red Hat rating Moderatelibreswan security update
- Red Hat Enterprise Linux AppStream E4S (v.9.0) libreswan-4.6-3.el9_0.3
- RHSA-2023:3095 Released 2023-05-16 · Red Hat rating Moderatelibreswan security and bug fix update
- Red Hat Enterprise Linux AppStream (v. 8) libreswan-4.9-2.el8_8.2
- RHSA-2023:2633 Released 2023-05-09 · Red Hat rating Moderatelibreswan security update
- Red Hat Enterprise Linux AppStream (v. 9) libreswan-4.9-2.el9_2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2023:3095 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2023:2633 |
| Red Hat Enterprise Linux AppStream E4S (v.9.0) | Fixed | RHSA-2024:10594 |
| Red Hat OpenShift Container Platform 4.15 | Fixed | — |
| Red Hat OpenShift Container Platform 4.16 | Fixed | — |
| Red Hat OpenShift Container Platform 4.17 | Fixed | — |
Not affected: 2 products
- Red Hat Enterprise Linux 7
- Red Hat OpenShift Container Platform 4.17
Timeline
- 2026-10-02 Threatist record created from CVE-2023-23009
- 2026-10-03 Alias added: GHSA-3gxg-hfhr-6g9x
References
Sources
- CVE-2023-23009 · CVE Program
- CVE-2023-23009 · NVD
- FIRST EPSS
- GHSA-3gxg-hfhr-6g9x · GitHub Advisory Database · CC BY 4.0
- CVE-2023-23009 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences