DEBIAN-CVE-2021-3733

Advisory lineage Upstream: 1 Downstream: 4
Upstream
CVE-2021-3733
Published: 10 Mar 2022, 17:42
Last modified:28 Apr 2026, 20:22

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
6.5 MEDIUM
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

10 Mar 2022, 17:42
Published
Vulnerability first disclosed
28 Apr 2026, 20:22
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Systems

  • debian•pypy3

    < 7.3.5+dfsg-2 | < 7.3.5+dfsg-2 | < 7.3.5+dfsg-2 | < 7.3.5+dfsg-2

  • debian•python2.7

    all

  • debian•python3.9

    < 3.9.2-1+deb11u2

References (1)