CVE-2015-7687: Fedoraproject Fedora

Critical severity, CVSS 9.8. EPSS: 4% chance of exploitation in the next 30 days.

Use-after-free vulnerability in OpenSMTPD before 5.7.2 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via vectors involving req_ca_vrfy_smtp and req_ca_vrfy_mta.

Affected products

• Fedoraproject Fedora: version 22 only; version 23 only
• OpenBSD OpenSMTPD: up to and including 5.7.1

Published 2017-10-16. Last modified 2026-06-17.