CVE-2010-1192: libESMTP, probably 1.0.4 and earlier, does not properly handle a '\0' character in a domain name in the sub...

Security readout for executives and security teams

This flaw lets an attacker in a network man-in-the-middle position trick software using libESMTP into accepting the wrong SSL server certificate. The issue is tied to null-byte handling in certificate Common Name fields. Business urgency depends on whether legacy libESMTP is still present in mail-sending systems. Exposure is most likely in legacy Linux or Unix applications that still link against libESMTP for SMTP over SSL/TLS. The source bundle does not identify specific downstream products beyond libESMTP, and the affected version range is stated as probable, not definitive. Treat this as a targeted legacy exposure issue. It is not listed as actively exploited in the provided sources, but affected mail paths could lose TLS server identity assurance if old libESMTP remains in use. Mitigation focus: Inventory systems and applications that use libESMTP.; Check installed libESMTP versions against vendor or distribution advisories.; Prioritize replacing or updating libESMTP 1.0.4 and earlier where found..

Prepared

Jun 28, 2026, 02:49 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.