CVEvulnerability

CVE-2021-3116

7.5 HIGH Published 2021-01-11 Modified 2026-06-17 Official page ↗

Status: Modified
Published: 2021-01-11
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0 ([email protected]): 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:P/A:N
Weaknesses: CWE-697

Description

before_upstream_connection in AuthPlugin in http/proxy/auth.py in proxy.py before 2.3.1 accepts incorrect Proxy-Authorization header data because of a boolean confusion (and versus or).

Affected configurations

• proxy.py project proxy.py (< 2.3.1)

Weakness · CWE (1)

CWE-697 Incorrect Comparison weakness

Referenced by CWE · observed example (4)

CWE-1390 Weak Authentication weakness
CWE-287 Improper Authentication weakness
CWE-480 Use of Incorrect Operator weakness
CWE-697 Incorrect Comparison weakness

References

https://cardaci.xyz/advisories/2021/01/10/proxy.py-2.3.0-broken-basic-authentication/ Exploit, Third Party Advisory
https://github.com/abhinavsingh/proxy.py/pull/482/commits/9b00093288237f5073c403f2c4f62acfdfa8ed46 Patch
https://pypi.org/project/proxy.py/2.3.1/#history Product
https://cardaci.xyz/advisories/2021/01/10/proxy.py-2.3.0-broken-basic-authentication/ Exploit, Third Party Advisory
https://github.com/abhinavsingh/proxy.py/pull/482/commits/9b00093288237f5073c403f2c4f62acfdfa8ed46 Patch
https://pypi.org/project/proxy.py/2.3.1/#history Product