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Vulnerability record · CVE-2021-43298 · published 25 January 2022

CVE-2021-43298: Embedthis goahead improper restriction of authentication attempts vulnerability

Embedthis · Goahead

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.

9.8 CVSS 3.1 Critical EPSS 2.3% · top 17.7% CWE-208 · CWE-208CWE-307 · Improper restriction of authentication attempts
9.8CVSS 3.1 base score, v2 5.0
2.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/embedthis/goahead/issues/304 Third Party Advisory
https://github.com/embedthis/goahead/issues/304 Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-43298), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.