{"id":"CVE-2009-0127","aliases":["DEBIAN-CVE-2009-0127","EUVD-2009-0136","GHSA-933f-4fwg-646j"],"status":"disputed","title":"** DISPUTED ** M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal...","description":"M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.  NOTE: a Linux vendor disputes the relevance of this report to the M2Crypto product because \"these functions are not used anywhere in m2crypto.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.01379,"percentile":0.7226,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2009-01-15T17:00:00Z","modified":"2026-10-23T17:47:38Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"m2crypto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.38.0-4","0.38.0-4.1","0.40.1-1","0.40.1-2","0.40.1-3","0.40.1-4","0.41.0+ds-1","0.41.0+ds-2","0.41.0+ds-3","0.41.0-1","0.42.0-1","0.42.0-2","0.42.0-2.1","0.42.0-3","0.46.2-1","0.46.2-2","0.46.2-3"]},{"source":"osv","ecosystem":"Debian:13","package":"m2crypto","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.42.0-3","0.46.2-1","0.46.2-2","0.46.2-3"]}],"products":[{"vendor":"heikkitoivonen","product":"m2crypto"}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=479676","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","evidence","report"]},{"url":"http://openwall.com/lists/oss-security/2009/01/12/4","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","article"]},{"url":"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=511515","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-0127"},{"url":"https://github.com/advisories/GHSA-933f-4fwg-646j"},{"url":"https://security-tracker.debian.org/tracker/CVE-2009-0127","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2009-0127","description":"M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.  NOTE: a Linux vendor disputes the relevance of this report to the M2Crypto product because \"these functions are not used anywhere in m2crypto.","status":"disputed","published":"2009-01-15T17:00:00Z","modified":"2024-09-16T21:03:01.336Z","updated_at":"2026-11-02T14:33:25.896677Z"}],"euvd":[{"id":"EUVD-2009-0136","description":"M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.  NOTE: a Linux vendor disputes the relevance of this report to the M2Crypto product because \"these functions are not used anywhere in m2crypto.","status":"published","published":"2009-01-15T17:00:00Z","modified":"2024-09-16T21:03:01Z","updated_at":"2026-11-03T00:55:08.578591Z"}],"ghsa":[{"id":"GHSA-933f-4fwg-646j","title":"** DISPUTED ** M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal...","description":"** DISPUTED ** M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.  NOTE: a Linux vendor disputes the relevance of this report to the M2Crypto product because \"these functions are not used anywhere in m2crypto.\"","status":"published","published":"2022-05-02T03:12:57Z","modified":"2023-01-31T05:07:01Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:49:08.279119Z"}],"nvd":[{"id":"CVE-2009-0127","description":"M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.  NOTE: a Linux vendor disputes the relevance of this report to the M2Crypto product because \"these functions are not used anywhere in m2crypto.","status":"disputed","published":"2009-01-15T17:30:00.577Z","modified":"2026-06-16T23:04:18.62Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:01:33.417327Z"}],"osv":[{"id":"CVE-2009-0127","description":"M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.  NOTE: a Linux vendor disputes the relevance of this report to the M2Crypto product because \"these functions are not used anywhere in m2crypto.","status":"published","published":"2009-01-15T17:30:00Z","modified":"2026-04-10T03:40:32.686305Z","updated_at":"2026-11-02T15:43:57.452479Z"},{"id":"DEBIAN-CVE-2009-0127","description":"M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077.  NOTE: a Linux vendor disputes the relevance of this report to the M2Crypto product because \"these functions are not used anywhere in m2crypto.","status":"published","published":"2009-01-15T17:30:00.577Z","modified":"2026-10-23T17:47:38.18430833Z","updated_at":"2026-11-02T15:45:23.742363Z"}]}}