Vulnerability in Python Urllib3
CVE-2016-9015
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.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.008 (53.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: -0.000
Affected products
- Python Urllib3 — versions 1.17, 1.18
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/93941 (VDB Entry, Third Party Advisory, vdb-entry)
- www.openwall.com/lists/oss-security/2016/10/27/6 (mailing-list, Mailing List, Mitigation)
Frequently asked questions
- What is CVE-2016-9015?
- CVE-2016-9015 is a low-severity vulnerability in Python Urllib3, classified under Improper Certificate Validation. CVSS score: 3.7/10. Published 2017-01-11.
- How severe is CVE-2016-9015?
- Low severity. CVSS v3 base score is 3.7 out of 10.
- Is CVE-2016-9015 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.