CVE-2021-45890

Name: CVE-2021-45890
Creator: NVD / NIST
Published: 2021-12-27T20:15:07.48+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.75%

Last modified Jun 17, 2026

CVE-2021-45890 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. basic/BasicAuthProvider.java in AuthGuard before 0.9.0 allows authentication via an inactive identifier.. EPSS estimates a 1.75% chance of exploitation in the next 30 days.

Description

basic/BasicAuthProvider.java in AuthGuard before 0.9.0 allows authentication via an inactive identifier.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.75%

74.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Authguard Project	Authguard	< 0.9.0

References

https://github.com/AuthGuard/AuthGuard/commit/9783b1143da6576028de23e15a1f198b1f937b82Patch, Third Party Advisory
https://github.com/AuthGuard/AuthGuard/compare/v0.8.0...v0.9.0Release Notes, Third Party Advisory
https://github.com/AuthGuard/AuthGuard/issues/166Issue Tracking, Third Party Advisory
https://github.com/AuthGuard/AuthGuard/pull/181Patch, Third Party Advisory
https://github.com/AuthGuard/AuthGuard/commit/9783b1143da6576028de23e15a1f198b1f937b82Patch, Third Party Advisory
https://github.com/AuthGuard/AuthGuard/compare/v0.8.0...v0.9.0Release Notes, Third Party Advisory
https://github.com/AuthGuard/AuthGuard/issues/166Issue Tracking, Third Party Advisory
https://github.com/AuthGuard/AuthGuard/pull/181Patch, Third Party Advisory

Timeline

Published: Dec 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-45890?

basic/BasicAuthProvider.java in AuthGuard before 0.9.0 allows authentication via an inactive identifier.

How severe is CVE-2021-45890?

CVE-2021-45890 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.75% probability of exploitation in the next 30 days.

How do I fix CVE-2021-45890?

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-2021-45890?

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

Scan your code now

Source: NVD / NIST