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CVE-2016-5769

32
FAUCET Score

CVE-2016-5769 describes multiple integer overflows in the mcrypt extension of PHP versions before 5.5.37, 5.6.23, and 7.0.8. This critical vulnerability, with a CVSS score of 9.8, allows remote attackers to trigger a denial of service through a heap-based buffer overflow and application crash, or potentially achieve other unspecified impacts, by providing a crafted length value to the mcrypt_generic or mdecrypt_generic functions. Despite its high severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.5.36CPE matchmatch criteria
cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
5.6.0CPE matchmatch criteria
cpe:2.3:a:php:php:5.6.0:alpha1:*:*:*:*:*:*
5.6.0CPE matchmatch criteria
cpe:2.3:a:php:php:5.6.0:alpha2:*:*:*:*:*:*
5.6.0CPE matchmatch criteria
cpe:2.3:a:php:php:5.6.0:alpha3:*:*:*:*:*:*
5.6.0CPE matchmatch criteria
cpe:2.3:a:php:php:5.6.0:alpha4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
8.36%
Probability of exploitation in next 30 days
EPSS Percentile
94.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0836 is in the 90th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Advisories (1)

redhatCVE-2016-5769Moderate

php: Integer Overflows in mcrypt_generic() and mdecrypt_generic() resulting in heap overflows

Jun 23, 2016

References

github.com / php/php-src/commit/6c5211a0cef0cc2854eaa387e0eb036e012904d0
lists.apple.com / archives/security-announce/2016/Sep/msg00006.html
lists.opensuse.org / opensuse-security-announce/2016-07/msg00004.html
lists.opensuse.org / opensuse-security-announce/2016-08/msg00025.html
lists.opensuse.org / opensuse-updates/2016-08/msg00003.html
php.net / ChangeLog-5.php
PatchRelease Notes
php.net / ChangeLog-7.php
Broken Link
bugs.php.net / bug.php
Vendor Advisory
h20566.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay
support.apple.com / HT207170
debian.org / security/2016/dsa-3618
openwall.com / lists/oss-security/2016/06/23/4
Release Notes
securityfocus.com / bid/91399