Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2021-3733

There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 62.1%
CVSS Severity
CVSS v3 Score 6.5
CVSS v2 Score 4.0
References
Products affected by CVE-2021-3733


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