CVE-2023-25566

Name: CVE-2023-25566
Creator: NVD / NIST
Published: 2023-02-14T18:15:13.38+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.10%

Last modified Jun 17, 2026

CVE-2023-25566 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, a memory leak can be triggered when parsing usernames which can trigger a denial-of-service. EPSS estimates a 1.10% chance of exploitation in the next 30 days.

Description

GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, a memory leak can be triggered when parsing usernames which can trigger a denial-of-service. The domain portion of a username may be overridden causing an allocated memory area the size of the domain name to be leaked. An attacker can leak memory via the main `gss_accept_sec_context` entry point, potentially causing a denial-of-service. This issue is fixed in version 1.2.0.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.10%

61.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Gss-Ntlmssp Project	Gss-Ntlmssp	< 1.2.0

References

https://github.com/gssapi/gss-ntlmssp/commit/8660fb16474054e692a596e9c79670cd4d3954f4Patch, Third Party Advisory
https://github.com/gssapi/gss-ntlmssp/releases/tag/v1.2.0Third Party Advisory
https://github.com/gssapi/gss-ntlmssp/security/advisories/GHSA-mfm4-6g58-jw74Third Party Advisory
https://github.com/gssapi/gss-ntlmssp/commit/8660fb16474054e692a596e9c79670cd4d3954f4Patch, Third Party Advisory
https://github.com/gssapi/gss-ntlmssp/releases/tag/v1.2.0Third Party Advisory
https://github.com/gssapi/gss-ntlmssp/security/advisories/GHSA-mfm4-6g58-jw74Third Party Advisory

Timeline

Published: Feb 14, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-25566?

How severe is CVE-2023-25566?

CVE-2023-25566 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.10% probability of exploitation in the next 30 days.

How do I fix CVE-2023-25566?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-25566?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST