ALPINE-CVE-2021-28363

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2021-28363
Published: 15 Mar 2021, 18:15
Last modified:03 Dec 2025, 22:49

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
6.5 MEDIUM
3.1 (osv_alpine)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

15 Mar 2021, 18:15
Published
Vulnerability first disclosed
03 Dec 2025, 22:49
Last Modified
Vulnerability information updated

Description

The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies. The initial connection to the HTTPS proxy (if an SSLContext isn't given via proxy_config) doesn't verify the hostname of the certificate. This means certificates for different servers that still validate properly with the default urllib3 SSLContext will be silently accepted.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected Systems

  • alpine•py3-urllib3

    < 1.26.4-r0 | < 1.26.4-r0 | < 1.26.4-r0 | < 1.26.4-r0 | < 1.26.4-r0 | < 1.26.4-r0 | < 1.26.4-r0 | < 1.26.4-r0 | < 1.26.4-r0 | < 1.26.4-r0

References (1)