🛡️ CVE-2016-9015 — urllib3

⚪ Unknown ✅ No Known Exploit CWE-295 OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Urllib3 Incorrect Certificate Validation

Versions 1.17 and 1.18 of the Python urllib3 library suffer from a vulnerability that can cause them, in certain configurations, to not correctly validate TLS certificates. This places users of the library with those configurations at risk of man-in-the-middle and information leakage attacks. This vulnerability affects users using versions 1.17 and 1.18 of the urllib3 library, who are using the optional PyOpenSSL support for TLS instead of the regular standard library TLS backend, and who are using OpenSSL 1.1.0 via PyOpenSSL. This is an extremely uncommon configuration, so the security impact of this vulnerability is low.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2016-9015 is classified as CWE-295: Improper Certificate Validation. A TLS certificate is accepted without proper verification, so a man-in-the-middle can present their own.

Affected software

CVE-2016-9015 is recorded against 1 package.

  • urllib3 (from 1.17 up to 1.18.1)

Timeline and source

Published on 17 May 2022 and last revised on 18 November 2024. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
web.archive.org (Web)
www.openwall.com (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE CWE-295
Public Exploit ✅ No
Source OSV
Published 2022-05-17
Updated 2026-08-12
Modified 2024-11-18
Fix URL N/A

Affected Packages

Software From version Fixed in
urllib3 1.17 1.18.1

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