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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.
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Compare it with CVE-2021-41615, CVE-2021-42342 and CVE-2019-5096 for nearby disclosures in the same product family.