CVE-2013-4314
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
02 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
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 1.19% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 68.0% of scored records. A rank, not a probability.
- NVD base score
- The NVD has published no score for this record
- NVD CVSS vector
- No NVD score to derive
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-16.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2013-09-30 21:00Z13 YR AGO
- Last updated
- 2024-08-06 16:38Z2 YR AGO
- Reserved
- 2013-06-12
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-20Improper Input ValidationClass
- Data version
- 5.1
- Document digest
- 942b6e66bf190359684d27804f6ba7136c18ce66f59f38aa62a6bdd3925dee0b
05 Affected products
06 References
- www.debian.orgDSA-2763http://www.debian.org/security/2013/dsa-2763
- mail.python.org[pyOpenSSL-Users] 20130904 pyOpenSSL 0.13.1https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1005325
- lists.opensuse.orgopenSUSE-SU-2013:1648http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html
- www.openwall.com[oss-security] 20130906 Re: CVE request: pyOpenSSL hostname check bypassing vulnerabilityhttp://www.openwall.com/lists/oss-security/2013/09/06/2
- www.ubuntu.comUSN-1965-1http://www.ubuntu.com/usn/USN-1965-1
07 Fixed in
Debian 12
- pyopenssl Fixed in 0.13-2.1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- pyopenssl Fixed in 0.13-2.1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- pyopenssl Fixed in 0.13-2.1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.