3.7

CVE-2016-9015: python urllib3 Improper Certificate Validation

Modified
AliasesSUSE-RU-2019:2627-1SUSE-SU-2019:0139-1GHSA-v4w5-p2hg-8fh6
Published 11-01-2017Last modified 06-08-2024

Vulnerability summary

CVE-2016-9015 is a low (CVSS 3.7) Improper Certificate Validation vulnerability in python urllib3. EPSS estimates a 0.75% chance of exploitation in the next 30 days, higher than 55.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.7, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
3.7/10
010
Low · v3.0 (NVD)
EPSS score
0.75%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 4
OPENSUSE-SU-2024:11277-1OPENSUSE-SU-2024:14055-1OPENSUSE-SU-2026:12044-1OPENSUSE-SU-2026:12045-1

Timeline

  1. 11-01-2017
    PublishedVulnerability first disclosed.
  2. 06-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 2 sources · 3 versions

EPSS trend

Probability

0.75%

Chance of exploitation in the next 30 days

Percentile

55%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.75% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse30 products
  • python-cliff&distro=SUSE Linux Enterprise Module for Public Cloud 12< 1.14.0-11.3.2
  • python-mock&distro=SUSE Linux Enterprise Module for Public Cloud 12< 2.0.0-3.7.25
  • python-oauthlib&distro=HPE Helion OpenStack 8< 0.7.2-3.9.20
  • python-oauthlib&distro=SUSE Linux Enterprise Module for Public Cloud 12< 0.7.2-3.9.20
  • python-oauthlib&distro=SUSE Manager Server 3.2< 0.7.2-3.9.20
Opensuse1 product
  • python3-urllib3&distro=openSUSE Tumbleweed< 1.18.1-1.2
PyPI1 product
  • urllib3≥ 1.17, < 1.18.1
Python1 product

4 vendors · 33 products

References

18 links
Show all 18 references