{"id":"CVE-2011-0633","aliases":["DEBIAN-CVE-2011-0633","EUVD-2011-0651","GHSA-3fhh-g5rg-6jpm"],"status":"published","title":"The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent...","description":"The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent, and other products, when running in environments that do not set the If-SSL-Cert-Subject header, does not enable full validation of SSL certificates by default, which allows remote attackers to spoof servers via man-in-the-middle (MITM) attacks involving hostnames that are not properly validated.  NOTE: it could be argued that this is a design limitation of the Net::HTTPS API, and separate implementations should be independently assigned CVE identifiers for not working around this limitation. However, because this API was modified within LWP, a single CVE identifier has been assigned.","severity":{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.04246,"percentile":0.91102,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2011-05-13T22:00:00Z","modified":"2026-10-23T17:47:27Z","fixes":[{"ecosystem":"Debian:12","package":"libwww-perl","fixed_in":["6.01-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"libwww-perl","fixed_in":["6.01-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"libwww-perl","fixed_in":["6.01-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"libwww-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.01-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"libwww-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.01-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"libwww-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.01-1"}]}]}],"products":[{"vendor":"gisle_aas","product":"libwww-perl"},{"vendor":"search.cpan","product":"libwww-perl"}],"references":[{"url":"http://vttynotes.blogspot.com/2010/12/man-in-middle-fun-with-perl-lwp.html","tags":["x_refsource_MISC","x_transferred","article"]},{"url":"http://cpansearch.perl.org/src/GAAS/libwww-perl-6.02/Changes","tags":["x_refsource_MISC","x_transferred","web"]},{"url":"http://vttynotes.blogspot.com/2011/03/quick-note-on-lwp-and-perl-security-cve.html","tags":["x_refsource_MISC","x_transferred","article"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-0633"},{"url":"https://github.com/advisories/GHSA-3fhh-g5rg-6jpm"},{"url":"https://security-tracker.debian.org/tracker/CVE-2011-0633","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2011-0633","description":"The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent, and other products, when running in environments that do not set the If-SSL-Cert-Subject header, does not enable full validation of SSL certificates by default, which allows remote attackers to spoof servers via man-in-the-middle (MITM) attacks involving hostnames that are not properly validated.  NOTE: it could be argued that this is a design limitation of the Net::HTTPS API, and separate implementations should be independently assigned CVE identifiers for not working around this limitation. However, because this API was modified within LWP, a single CVE identifier has been assigned.","status":"published","published":"2011-05-13T22:00:00Z","modified":"2024-09-16T17:53:46.874Z","updated_at":"2026-11-02T14:35:38.711857Z"}],"euvd":[{"id":"EUVD-2011-0651","description":"The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent, and other products, when running in environments that do not set the If-SSL-Cert-Subject header, does not enable full validation of SSL certificates by default, which allows remote attackers to spoof servers via man-in-the-middle (MITM) attacks involving hostnames that are not properly validated.  NOTE: it could be argued that this is a design limitation of the Net::HTTPS API, and separate implementations should be independently assigned CVE identifiers for not working around this limitation. However, because this API was modified within LWP, a single CVE identifier has been assigned.","status":"published","published":"2011-05-13T22:00:00Z","modified":"2024-09-16T17:53:46Z","updated_at":"2026-11-03T00:55:37.743963Z"}],"ghsa":[{"id":"GHSA-3fhh-g5rg-6jpm","title":"The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent...","description":"The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent, and other products, when running in environments that do not set the If-SSL-Cert-Subject header, does not enable full validation of SSL certificates by default, which allows remote attackers to spoof servers via man-in-the-middle (MITM) attacks involving hostnames that are not properly validated.  NOTE: it could be argued that this is a design limitation of the Net::HTTPS API, and separate implementations should be independently assigned CVE identifiers for not working around this limitation. However, because this API was modified within LWP, a single CVE identifier has been assigned.","status":"published","published":"2022-05-14T02:14:23Z","modified":"2023-02-02T05:05:45Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:52:10.243145Z"}],"nvd":[{"id":"CVE-2011-0633","description":"The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent, and other products, when running in environments that do not set the If-SSL-Cert-Subject header, does not enable full validation of SSL certificates by default, which allows remote attackers to spoof servers via man-in-the-middle (MITM) attacks involving hostnames that are not properly validated.  NOTE: it could be argued that this is a design limitation of the Net::HTTPS API, and separate implementations should be independently assigned CVE identifiers for not working around this limitation. However, because this API was modified within LWP, a single CVE identifier has been assigned.","status":"published","published":"2011-05-13T22:55:01.61Z","modified":"2026-06-16T23:27:46.963Z","cvss":[{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:02:08.47516Z"}],"osv":[{"id":"CVE-2011-0633","description":"The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent, and other products, when running in environments that do not set the If-SSL-Cert-Subject header, does not enable full validation of SSL certificates by default, which allows remote attackers to spoof servers via man-in-the-middle (MITM) attacks involving hostnames that are not properly validated.  NOTE: it could be argued that this is a design limitation of the Net::HTTPS API, and separate implementations should be independently assigned CVE identifiers for not working around this limitation. However, because this API was modified within LWP, a single CVE identifier has been assigned.","status":"published","published":"2011-05-13T22:55:01Z","modified":"2026-04-10T03:41:37.896081Z","updated_at":"2026-11-02T15:43:57.991581Z"},{"id":"DEBIAN-CVE-2011-0633","description":"The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent, and other products, when running in environments that do not set the If-SSL-Cert-Subject header, does not enable full validation of SSL certificates by default, which allows remote attackers to spoof servers via man-in-the-middle (MITM) attacks involving hostnames that are not properly validated.  NOTE: it could be argued that this is a design limitation of the Net::HTTPS API, and separate implementations should be independently assigned CVE identifiers for not working around this limitation. However, because this API was modified within LWP, a single CVE identifier has been assigned.","status":"published","published":"2011-05-13T22:55:01.61Z","modified":"2026-10-23T17:47:27.281430314Z","updated_at":"2026-11-02T15:45:24.316685Z"}]}}