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CVE-2013-3735

20
FAUCET Score

CVE-2013-3735 describes a denial-of-service vulnerability in the Zend Engine of PHP versions before 5.4.16 RC1 and 5.5.0 before RC2. Attackers can exploit a flaw in how parser errors are handled by crafting a malicious function definition, leading to memory exhaustion and application crashes, particularly in shared hosting environments. This vulnerability has a CVSS v3.1 score of 7.5 (High), indicating a network-based attack with low complexity and a high impact on availability. 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
<= 5.4.15CPE matchmatch criteria
cpe:2.3:a:php:php:*:rc1:*:*:*:*:*:*
5.4.0CPE matchmatch criteria
cpe:2.3:a:php:php:5.4.0:*:*:*:*:*:*:*
5.4.1CPE matchmatch criteria
cpe:2.3:a:php:php:5.4.1:*:*:*:*:*:*:*
5.4.2CPE matchmatch criteria
cpe:2.3:a:php:php:5.4.2:*:*:*:*:*:*:*
5.4.3CPE matchmatch criteria
cpe:2.3:a:php:php:5.4.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.83%
Probability of exploitation in next 30 days
EPSS Percentile
85.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0283 is in the 74th percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2013-3735

php: DoS (memory exhaustion, application crash) via crafted function definition

May 23, 2013

References

bugs.php.net / bug.php
github.com / php/php-src/blob/php-5.4.16RC1/NEWS
github.com / php/php-src/blob/php-5.5.0RC2/NEWS
github.com / php/php-src/commit/fb58e69a84f4fde603a630d2c9df2fa3be16d846
ExploitPatch