Is CVE-2023-6004 in the CISA KEV catalog?

No. CVE-2023-6004 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-6004?

CVE-2023-6004 has a CVSS v3 base score of 4.8 (MEDIUM).

What is the EPSS score for CVE-2023-6004?

CVE-2023-6004 has an EPSS score of 0.45% (36th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-6004?

Upgrade libssh on debian 11 to 0.9.8-0+deb11u1 or later. Fixes are available for 14 affected products.

CVE & CISA-KEV Catalog

CVE-2023-6004

MEDIUM

4.8

CVSS v3

NVD

Description

A flaw was found in libssh. By utilizing the ProxyCommand or ProxyJump feature, users can exploit unchecked hostname syntax on the client. This issue may allow an attacker to inject malicious code into the command of the features mentioned through the hostname parameter.

CWE-74Injection

How to fix

Remediation Available

libsshDebian

Fixed in:0.9.8-0+deb11u1CVE-2023-6004

Fixed in:0.10.6-0+deb12u1CVE-2023-6004

Fixed in:0.10.6-1CVE-2023-6004

libsshRocky

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libsshRed Hat / RHEL

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-configRocky

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-configRed Hat / RHEL

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-debuginfoRocky

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-debuginfoRed Hat / RHEL

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-debugsourceRed Hat / RHEL

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-debugsourceRocky

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-develRed Hat / RHEL

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libssh-develRocky

Fixed in:0:0.9.6-14.el8RHSA-2024:3233

Fixed in:0:0.10.4-13.el9RHSA-2024:2504

libsshUbuntu

Fixed in:0.6.3-4.3ubuntu0.6+esm1USN-6592-2

Fixed in:0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3USN-6592-2

Fixed in:0.9.3-2ubuntu2.5USN-6592-1

Fixed in:0.9.6-2ubuntu0.22.04.3USN-6592-1

Fixed in:0.10.4-2ubuntu0.3USN-6592-1

Fixed in:0.10.5-3ubuntu1.2USN-6592-1

libssh-4Ubuntu

Fixed in:0.6.3-4.3ubuntu0.6+esm1USN-6592-2

Fixed in:0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3USN-6592-2

Fixed in:0.9.3-2ubuntu2.5USN-6592-1

Fixed in:0.9.6-2ubuntu0.22.04.3USN-6592-1

Fixed in:0.10.4-2ubuntu0.3USN-6592-1

Fixed in:0.10.5-3ubuntu1.2USN-6592-1

libssh-gcrypt-4Ubuntu

Fixed in:0.6.3-4.3ubuntu0.6+esm1USN-6592-2

Fixed in:0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3USN-6592-2

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

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

Exploit Intelligence

0.45%probability of exploitation in 30 days

36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Vendor Advisory1

access.redhat.com

Issue Tracking1

bugzilla.redhat.com

Mailing List1

libssh.org

Other references5

Related Vulnerabilities

Other CWE-74 (Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2013-2251	Critical	9.8	100%	KEV	Fix
CVE-2023-22527	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-2725	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2022-35914	Critical	9.8	100%	KEV	-
CVE-2019-17558	High	7.5	99%	KEV	Fix

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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 2025-11-04.