What’s Vulnerable › Vulnerabilities
CVE-2021-43298
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2022-01-25 · updated 2026-06-17
- Weakness: CWE-208
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.
Affected products
- EmbedThis GoAhead: before 5.1.4 — fixed in 5.1.4
How to fix
Upgrade to a fixed version: EmbedThis GoAhead 5.1.4. Check the vendor advisory for mitigations.
References
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