VYPR
Medium severity6.5NVD Advisory· Published Mar 10, 2022· Updated Jun 17, 2026

CVE-2021-3733

CVE-2021-3733

Description

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.

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Affected products

258

Patches

Vulnerability mechanics

References

9

News mentions

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