01 Record

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.

MediumPUBLISHEDCNA: mitre

CNA base score6.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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02 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.

03 Exploitation and scoring

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.60% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 75.3% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2023-02-21 00:00Z3 YR AGO

Last updated

2025-03-17 17:02Z1 YR AGO

Reserved

2023-01-11

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 6.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-400Uncontrolled Resource ConsumptionClass
CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

d5f9c3260d74640b305e2e0b8133395b58b126beaccaec51ba4cc69ef86c13b8

05 Affected products

VendorProductVersionsPlatforms

debiandebian_linuxNot specified—

libreswanlibreswanNot specified—

redhatenterprise_linuxNot specified—

redhatopenshiftNot specified—

redhatrhel_e4sNot specified—

06 References

github.comhttps://github.com/libreswan/libreswan/issues/954
www.debian.orgDSA-5368https://www.debian.org/security/2023/dsa-5368vendor-advisory
lists.fedoraproject.orgFEDORA-2023-a2348480cbhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2MFOIQX2LRL43P3GJT33DE7G7COHNXDN/vendor-advisory
lists.fedoraproject.orgFEDORA-2023-42ec148952https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CSMYJH7MC2FZGCY5NH5AXULO3ISXIHOF/vendor-advisory

07 Fixed in

AlmaLinux 8

libreswan
Fixed in 4.9-2.el8_8.2

AlmaLinux 9

libreswan
Fixed in 4.9-2.el9_2

CloudLinux 8

libreswan
Fixed in 4.9-2.el8_8.2

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

CloudLinux 9

libreswan
Fixed in 4.9-2.el9_2

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Debian 12

libreswan
Fixed in 4.9-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

libreswan
Fixed in 4.9-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

libreswan
Fixed in 4.9-2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.