CVE-2016-9015

low-risk
Published 2017-01-11

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.

Do I need to act?

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0.06% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.7/10 Low
NETWORK / HIGH complexity

Affected Products (2)

Urllib3
Urllib3

Affected Vendors

Python

References (4)

Mailing List http://www.openwall.com/lists/oss-security/2016/10/27/6
Third Party Advisory http://www.securityfocus.com/bid/93941
Mailing List http://www.openwall.com/lists/oss-security/2016/10/27/6
Third Party Advisory http://www.securityfocus.com/bid/93941
20
/ 100
low-risk
Severity 13/34 · Low
Exploitability 0/34 · Minimal
Exposure 7/34 · Low