{"cve":"CVE-2013-4314","nvd":{"published":"2013-09-30T21:55:09.583","modified":"2026-06-16T23:57:00.677","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"references":["http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html","http://www.debian.org/security/2013/dsa-2763","http://www.openwall.com/lists/oss-security/2013/09/06/2","http://www.ubuntu.com/usn/USN-1965-1","https://bugzilla.redhat.com/show_bug.cgi?id=1005325"],"products":["canonical:ubuntu_linux","jean-paul_calderone:pyopenssl"],"source":"nvd","synced_at":"2026-10-19T20:30:15.895642412+00:00"},"epss":{"cve":"CVE-2013-4314","score":0.01197,"percentile":0.68115,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-6748-36qp-fx6r","url":"https://osv.dev/vulnerability/GHSA-6748-36qp-fx6r","summary":"PyOpenSSL Mishandles NUL Byte In Certificate Subject Alternative Name","modified":"2024-10-24T22:06:51.043867Z","packages":[{"ecosystem":"PyPI","name":"pyopenssl","purl":"pkg:pypi/pyopenssl","ranges":["<0.13.1"],"fixed":["0.13.1"]}]},{"id":"PYSEC-2013-31","url":"https://osv.dev/vulnerability/PYSEC-2013-31","summary":"","modified":"2026-06-10T17:01:45.680612135Z","packages":[{"ecosystem":"PyPI","name":"pyopenssl","purl":"pkg:pypi/pyopenssl","ranges":["<0.13.1"],"fixed":["0.13.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}