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Vulnerability record · CVE-2023-1667 · published 26 May 2023

CVE-2023-1667: Libssh null pointer dereference vulnerability

Libssh · Libssh

A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may allow an authenticated client to cause a denial of service.

6.5 CVSS 3.1 Medium EPSS 1.3% · top 30.4% CWE-476 · NULL pointer dereference
6.5CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may allow an authenticated client to cause a denial of service.

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

Affected products

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

References

LinkTags
http://www.libssh.org/security/advisories/CVE-2023-1667.txt Vendor Advisory
https://access.redhat.com/security/cve/CVE-2023-1667 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2182199 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/05/msg00029.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27PD44ALQTZXX7K6JAM3BXB
https://security.gentoo.org/glsa/202312-05
http://www.libssh.org/security/advisories/CVE-2023-1667.txt Vendor Advisory
https://access.redhat.com/security/cve/CVE-2023-1667 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2182199 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/05/msg00029.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27PD44ALQTZXX7K6JAM3BXB
https://security.gentoo.org/glsa/202312-05

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Source: NIST National Vulnerability Database (record CVE-2023-1667), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.