CVE-2016-4556
squid: SIGSEGV in ESIContext response handling
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Severity
ModerateRed Hat Product Security
CVSS 2.0
Review impact separately from score.
Published · May 6, 2016
Updated · November 21, 2025
Description
An incorrect reference counting flaw was found in the way Squid processes ESI responses. If Squid is configured as reverse-proxy, for TLS/HTTPS interception, an attacker controlling a server accessed by Squid, could crash the squid worker, causing a Denial of Service attack.
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 2.0 · 4.3AV:N/AC:M/Au:N/C:N/I:N/A:P
CWE-20 · Improper Input Validation