CVE-2016-6309: OpenSSL

Critical severity, CVSS 9.8. EPSS: 70.2% chance of exploitation in the next 30 days.

statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote attackers to cause a denial of service (use-after-free) or possibly execute arbitrary code via a crafted TLS session.

Affected products

• OpenSSL OpenSSL: version 1.1.0a only

Published 2016-09-26. Last modified 2026-06-17.