{"id":"CVE-2015-1793","url":"https://www.cyber-defence.io/tools/cve/CVE-2015-1793","generatedAt":"2026-11-05T06:13:09.940Z","title":"The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to…","description":"The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate.","published":"2015-07-09T19:17:00.000Z","lastModified":"2026-06-17T00:23:01.000Z","status":"Modified","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.0","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"cwe":["CWE-254"],"affected":["oracle/supply chain products suite","oracle/jd edwards enterpriseone tools","openssl/openssl","oracle/opus 10g ethernet switch family"],"epss":{"score":0.58213,"percentile":0.99095,"date":"2026-11-04","history":[{"date":"2026-09-21","score":0.7115,"percentile":0.99396},{"date":"2026-09-22","score":0.62394,"percentile":0.99147},{"date":"2026-10-03","score":0.58447,"percentile":0.99076}]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2015-11-05","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":38640,"kind":"exploit","title":"OpenSSL - Alternative Chains Certificate Forgery","url":"https://www.exploit-db.com/exploits/38640","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/webapps/38640.rb","file":"exploits/multiple/webapps/38640.rb","published":"2015-11-05","added":"2015-11-05","updated":"2015-11-05","author":"Ramon de C Valle","type":"webapps","platform":"multiple","port":null,"verified":false,"codes":["CVE-2015-1793","OSVDB-124300"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 58.2%, higher than 99% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-21T00:00:00.000Z","detail":{"to":0.7115,"from":0.62394,"percentile":0.99396},"summary":"EPSS moved from 62.4% to 71.2% probability of exploitation in the next thirty days."}],"references":[{"url":"http://fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery","source":"secalert@redhat.com"},{"url":"http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2015-008.txt.asc","source":"secalert@redhat.com"},{"url":"http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10694","source":"secalert@redhat.com"},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161747.html","source":"secalert@redhat.com"},{"url":"http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161782.html","source":"secalert@redhat.com"},{"url":"http://marc.info/?l=bugtraq&m=143880121627664&w=2","source":"secalert@redhat.com"},{"url":"http://marc.info/?l=bugtraq&m=144370846326989&w=2","source":"secalert@redhat.com"},{"url":"http://openssl.org/news/secadv_20150709.txt","tags":["Vendor 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BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}