CVE-2016-6309

openssl: Use After Free for large message sizes

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Severity

Critical

Red Hat Product Security

9.8

CVSS 3.0

Review impact separately from score.

Published · September 26, 2016

Updated · August 5, 2026

Description

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.

Statement

This issue did not affect any Red Hat product as they do not yet include OpenSSL 1.1.0.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 2.0 · 9.3
AV:N/AC:M/Au:N/C:C/I:C/A:C

CWE-416 · Use After Free