CVE-2021-43298

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

The code that performs password matching when using 'Basic' HTTP authentication does not use a constant-time memcmp and has no rate-limiting. This means that an unauthenticated network attacker can brute-force the HTTP basic password, byte-by-byte, by recording the webserver's response time until the unauthorized (401) response.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-208CWE-307

Affected software

No affected versions have been published.

Timeline

Published
Jan 25, 2022
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-43298: Critical severity, CVSS 9.8 | Vulnix