{"cve":"CVE-2014-3556","nvd":{"published":"2014-12-29T20:59:03.943","modified":"2026-06-17T00:08:28.650","status":"Modified","description":"The STARTTLS implementation in mail/ngx_mail_smtp_handler.c in the SMTP proxy in nginx 1.5.x and 1.6.x before 1.6.1 and 1.7.x before 1.7.4 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a \"plaintext command injection\" attack, a similar issue to CVE-2011-0411.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-77"],"references":["http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.html","http://marc.info/?l=bugtraq&m=142103967620673&w=2","http://nginx.org/download/patch.2014.starttls.txt","https://bugzilla.redhat.com/show_bug.cgi?id=1126891","http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.html"],"products":["f5:nginx"],"source":"nvd","synced_at":"2026-10-19T20:34:45.729216538+00:00"},"epss":{"cve":"CVE-2014-3556","score":0.07832,"percentile":0.94677,"date":"2026-10-31"},"kev":null,"osv":[],"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."]}