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Vulnerability record · CVE-2023-2295 · published 17 May 2023

CVE-2023-2295: Libreswan uncontrolled resource consumption vulnerability

Libreswan · Libreswan

A vulnerability was found in the libreswan library. This security issue occurs when an IKEv1 Aggressive Mode packet is received with only unacceptable crypto algorithms, and the response packet is not sent with a zero responder SPI. When a subsequent packet is received where the sender reuses the libreswan responder SPI as its own initiator SPI, the pluto daemon state machine crashes. No remote code execution is possible. This CVE exists because of a CVE-2023-30570 security regression for libreswan package in Red Hat Enterprise Linux 8.8 and Red Hat Enterprise Linux 9.2.

7.5 CVSS 3.1 High EPSS 1.6% · top 25.5% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

A vulnerability was found in the libreswan library. This security issue occurs when an IKEv1 Aggressive Mode packet is received with only unacceptable crypto algorithms, and the response packet is not sent with a zero responder SPI. When a subsequent packet is received where the sender reuses the libreswan responder SPI as its own initiator SPI, the pluto daemon state machine crashes. No remote code execution is possible. This CVE exists because of a CVE-2023-30570 security regression for libreswan package in Red Hat Enterprise Linux 8.8 and Red Hat Enterprise Linux 9.2.

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

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2023:3107 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:3148 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-2295 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2189777 Issue Tracking
https://access.redhat.com/errata/RHSA-2023:3107 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:3148 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-2295 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2189777 Issue Tracking

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Source: NIST National Vulnerability Database (record CVE-2023-2295), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.