🛡️ UBUNTU-CVE-2021-3733
⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2021-09-02
Updated 2026-06-15
Modified 2026-04-22
Fix URL N/A

Affected Packages

Software From version Fixed in
python3.4 — 3.4.3-1ubuntu1~14.04.7+esm11
python3.5 — 3.5.2-2ubuntu0~16.04.13+esm1
python3.6 — 3.6.9-1~18.04ubuntu1.6
python3.7 — 3.7.5-2ubuntu1~18.04.2
python3.8 — 3.8.10-0ubuntu1~20.04
python3.9 — 3.9.5-3~20.04.1

References

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