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Vulnerabilities

Vulnerability · CVE-2025-5372

A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation.

Published Jul 4, 2025 · catalog updated Sep 1, 2026 · Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Check this week

CVE-2025-5372 is not in CISA KEV. FIRST estimates a 50.00% chance of exploitation in the next 30 days. Check whether you run Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
50.00%
Remediation
Advisory link
Affected products
vendor Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On patch: 0:0.9.6-4.el8_6.2

A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographic key buffers being used in subsequent communication, potentially compromising SSH sessions' confidentiality, integrity, and availability.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On patch: 0:0.9.6-4.el8_6.2patch: 0:0.9.6-4.el8_6.2

How to fix CVE-2025-5372

  • Recommended remediation

    A patch or advisory reference is linked. Open the original publisher for availability by product version.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-5372 is not in CISA KEV. FIRST estimates a 50.00% chance of exploitation in the next 30 days. Check whether you run Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.

Which versions are affected?

Compare what you have installed with Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On patch: 0:0.9.6-4.el8_6.2 patch: 0:0.9.6-4.el8_6.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 50.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 4, 2025 · EUVD

    Detected

    A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographi

  2. Sep 1, 2026 · EUVD

    Updated

    A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the function may mistakenly return a success status even when key derivation fails. This results in uninitialized cryptographi

Sources

  • EUVDVulnerability recordEUVD-2025-19931

    A flaw was found in libssh versions built with OpenSSL versions older than 3.0, specifically in the ssh_kdf() function responsible for key derivation. Due to inconsistent interpretation of return values where OpenSSL uses 0 to indicate failure and libssh uses 0 for success—the fu

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Sep 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.