CVE-2023-1667
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.
02 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.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 1.31% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 70.2% 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
- 2023-05-26 00:00Z3 YR AGO
- Last updated
- 2024-08-02 05:57Z2 YR AGO
- Reserved
- 2023-03-27
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-476NULL Pointer DereferenceBase
- Data version
- 5.1
- Document digest
- 4c9304ba346170b18dbe03ce277c7bb316364a4b9d7df4dd648c9ac562b6deb3
05 Affected products
06 References
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2023-1667
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2182199
- www.libssh.orghttp://www.libssh.org/security/advisories/CVE-2023-1667.txt
- lists.fedoraproject.orgFEDORA-2023-5fa5ca2043https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27PD44ALQTZXX7K6JAM3BXBUHYA6DFFN/
- lists.debian.org[debian-lts-announce] 20230529 [SECURITY] [DLA 3437-1] libssh security updatehttps://lists.debian.org/debian-lts-announce/2023/05/msg00029.html
- security.gentoo.orgGLSA-202312-05https://security.gentoo.org/glsa/202312-05
07 Fixed in
AlmaLinux 8
- libssh Fixed in 0.9.6-10.el8_8
- libssh-config Fixed in 0.9.6-10.el8_8
- libssh-devel Fixed in 0.9.6-10.el8_8
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- libssh Fixed in 0.10.4-11.el9
- libssh-config Fixed in 0.10.4-11.el9
- libssh-devel Fixed in 0.10.4-11.el9
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- libssh Fixed in 0.9.6-10.el8_8
- libssh-config Fixed in 0.9.6-10.el8_8
- libssh-devel Fixed in 0.9.6-10.el8_8
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- libssh Fixed in 0.10.4-11.el9
- libssh-config Fixed in 0.10.4-11.el9
- libssh-devel Fixed in 0.10.4-11.el9
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- libssh Fixed in 0.10.5-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- libssh Fixed in 0.10.5-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- libssh Fixed in 0.10.5-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- libssh Fixed in 0.9.3-2ubuntu2.3
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- libssh Fixed in 0.9.6-2ubuntu0.22.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- libssh No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- libssh No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.