CVE-2025-55299

Name: CVE-2025-55299
Creator: NVD / NIST
Published: 2025-08-18T18:15:40.023+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.4/10EPSS 0.22%

Last modified Jun 17, 2026

CVE-2025-55299 is a critical-severity vulnerability rated 9.4/10 on the CVSS scale. VaulTLS is a modern solution for managing mTLS (mutual TLS) certificates. Prior to 0.9.1, user accounts created through the User web UI have an empty but not NULL password set, attackers can use this to login with an empty password. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

Description

VaulTLS is a modern solution for managing mTLS (mutual TLS) certificates. Prior to 0.9.1, user accounts created through the User web UI have an empty but not NULL password set, attackers can use this to login with an empty password. This is combined with that fact, that previously disabling the password based login only effected the frontend, but still allowed login via the API. This vulnerability is fixed in 0.9.1.

Metrics

CVSS 3.1

9.4/10

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

EPSS Probability

0.22%

11.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-521

References

Timeline

Published: Aug 18, 2025
Last Modified: Jun 17, 2026
Status: Deferred

Frequently Asked Questions

What is CVE-2025-55299?

How severe is CVE-2025-55299?

CVE-2025-55299 has a CVSS score of 9.4/10 (CRITICAL severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.

How do I fix CVE-2025-55299?

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-2025-55299?

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

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Source: NVD / NIST