CVE-2013-4314
pyopenssl - hostname check bypassing
7.5
HIGH
CVSS 3.1
EPSS 0.25%
Description
The X509Extension in pyOpenSSL before 0.13.1 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority.
How to fix CVE-2013-4314
To remediate CVE-2013-4314, upgrade the affected package to a fixed version below.
- —upgrade to 0.13-2.1 or later
- —upgrade to 0.10-1+squeeze1 or later
- —upgrade to 0.13.1 or later
- —upgrade to 0.13.1 or later
Is CVE-2013-4314 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 0.13-2.1
- from 0, < 0.10-1+squeeze1
- from 0, < 0.13.1
- from 0, < 0.13.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |