CVE-2016-6295

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2016-07-25 · updated 2026-06-17
Weakness: CWE-416

Description

ext/snmp/snmp.c in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9 improperly interacts with the unserialize implementation and garbage collection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly have unspecified other impact via crafted serialized data, a related issue to CVE-2016-5773.

Affected products

PHP: through 5.5.37; 5.6.0-alpha1, 5.6.0-alpha2, 5.6.0-alpha3, 5.6.0-alpha4, 5.6.0-alpha5, 5.6.0-beta1 (+33)

References

http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=cab1c3b3708eead315e033359d07049b23b147a3
http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
http://openwall.com/lists/oss-security/2016/07/24/2
http://php.net/ChangeLog-5.php
http://php.net/ChangeLog-7.php
http://rhn.redhat.com/errata/RHSA-2016-2750.html
http://www.debian.org/security/2016/dsa-3631
http://www.securityfocus.com/bid/92094
http://www.securitytracker.com/id/1036430
https://bugs.php.net/72479
https://security.gentoo.org/glsa/201611-22
https://support.apple.com/HT207170

Get alerted when CVE-2016-6295 or the next vulnerability affects your stack