CVE-2013-3735

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory published 2022-05-17. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The Zend Engine in PHP before 5.4.16 RC1, and 5.5.0 before RC2, does not properly determine whether a parser error occurred, which allows context-dependent attackers to cause a denial of service (memory consumption and application crash) via a crafted function definition, as demonstrated by an attack within a shared web-hosting environment. NOTE: the vendor's http://php.net/security-note.php page says "for critical security situations you should be using OS-level security by running multiple web servers each as their own user id.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
86%
KEV
Not listed

Published

May 31, 2013

Last Modified

April 29, 2026

Advisory Details (4)

Auto-updated Apr 30, 2026
No patch confirmed yet.
generic

fix bug #64660 - yyparse can return 2, not only 1 · php/php-src@fb58e69 · GitHub

https://github.com/php/php-src/commit/fb58e69a84f4fde603a630d2c9df2fa3be16d846
generic

php-src/NEWS at php-5.5.0RC2 · php/php-src · GitHub

https://github.com/php/php-src/blob/php-5.5.0RC2/NEWS
generic

php-src/NEWS at php-5.4.16RC1 · php/php-src · GitHub

https://github.com/php/php-src/blob/php-5.4.16RC1/NEWS
generic

PHP :: You must be logged in

https://bugs.php.net/bug.php?id=64660

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 18× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 113 total refreshes for this CVE.

  1. 2026-08-21 23:44 UTCEPSS rescore
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  19. 2026-07-23 01:10 UTCEG score recompute
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  69. 2026-05-28 23:46 UTCEG score recompute
  70. 2026-05-28 23:46 UTCGHSA enrichment
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Frequently asked(5)

What is CVE-2013-3735?
CVE-2013-3735 is a high vulnerability published on May 31, 2013. The Zend Engine in PHP before 5.4.16 RC1, and 5.5.0 before RC2, does not properly determine whether a parser error occurred, which allows context-dependent attackers to cause a denial of service (memory consumption and application crash) via a crafted function definition, as demonstrated by an…
When was CVE-2013-3735 disclosed?
CVE-2013-3735 was first published in the National Vulnerability Database on May 31, 2013, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-3735 actively exploited?
CVE-2013-3735 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 14.5% of all scored CVEs.
What is the CVSS score of CVE-2013-3735?
CVE-2013-3735 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2013-3735?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-3735, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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