Is CVE-2023-1667 in the CISA KEV catalog?

No. CVE-2023-1667 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-1667?

CVE-2023-1667 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2023-1667?

CVE-2023-1667 has an EPSS score of 1.31% (67th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-1667?

Upgrade libssh on debian 11 to 0.9.7-0+deb11u1 or later. Fixes are available for 13 affected products.

CVE & CISA-KEV Catalog

CVE-2023-1667

MEDIUM

6.5

CVSS v3

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.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

libsshDebian

Fixed in:0.9.7-0+deb11u1CVE-2023-1667

Fixed in:0.10.5-1CVE-2023-1667

libsshRocky

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.10.4-11.el9RHSA-2023:6643

libsshRed Hat / RHEL

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.10.4-11.el9RHSA-2023:6643

libssh-configRocky

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.10.4-11.el9RHSA-2023:6643

libssh-configRed Hat / RHEL

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.10.4-11.el9RHSA-2023:6643

libssh-debuginfoRocky

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.10.4-11.el9RHSA-2023:6643

libssh-debuginfoRed Hat / RHEL

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.10.4-11.el9RHSA-2023:6643

libssh-debugsourceRocky

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.10.4-11.el9RHSA-2023:6643

libssh-debugsourceRed Hat / RHEL

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.10.4-11.el9RHSA-2023:6643

libssh-develRed Hat / RHEL

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.10.4-11.el9RHSA-2023:6643

libssh-develRocky

Fixed in:0:0.9.6-4.el8_6RHSA-2024:0538

Fixed in:0:0.9.6-10.el8_8RHSA-2023:3839

Fixed in:0:0.10.4-11.el9RHSA-2023:6643

libsshUbuntu

Fixed in:0.9.3-2ubuntu2.3USN-6138-1

Fixed in:0.9.6-2ubuntu0.22.04.1USN-6138-1

Fixed in:0.9.6-2ubuntu0.22.10.1USN-6138-1

Fixed in:0.10.4-2ubuntu0.1USN-6138-1

libssh-4Ubuntu

Fixed in:0.9.3-2ubuntu2.3USN-6138-1

Fixed in:0.9.6-2ubuntu0.22.04.1USN-6138-1

Fixed in:0.9.6-2ubuntu0.22.10.1USN-6138-1

Fixed in:0.10.4-2ubuntu0.1USN-6138-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.31%probability of exploitation in 30 days

67thpercentile

Moderate risk: more likely to be exploited than 67% of all known CVEs.

References

Vendor Advisory1

libssh.org

Third-Party Advisory3

Other references2

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

Embed a live status badge for CVE-2023-1667

Markdown

[![CVE-2023-1667](https://tridentstack.com/cve/badge/CVE-2023-1667.svg)](https://tridentstack.com/cve/CVE-2023-1667)

HTML

<a href="https://tridentstack.com/cve/CVE-2023-1667"><img src="https://tridentstack.com/cve/badge/CVE-2023-1667.svg" alt="CVE-2023-1667"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.