CVE-2009-3294

NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 3%CVSS: —Exploit: NoneExposed: 0

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

The popen API function in TSRM/tsrm_win32.c in PHP before 5.2.11 and 5.3.x before 5.3.1, when running on certain Windows operating systems, allows context-dependent attackers to cause a denial of service (crash) via a crafted (1) "e" or (2) "er" string in the second argument (aka mode), possibly related to the _fdopen function in the Microsoft C runtime library. NOTE: this might not cross privilege boundaries except in rare cases in which the mode argument is accessible to an attacker outside of an application that uses the popen function.

CVSS v3
—
EG Score
0.0(none)
EPSS
84.3%
KEV
Not listed

Published

September 22, 2009

Last Modified

April 23, 2026

References (22)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 37× 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.

  1. 2026-07-06 16:23 UTCEPSS rescore
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  48. 2026-05-20 11:21 UTCEPSS rescore
  49. 2026-05-20 11:20 UTCEPSS rescore
  50. 2026-05-18 21:29 UTCEPSS rescore

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Frequently asked(4)

What is CVE-2009-3294?
CVE-2009-3294 is a none vulnerability published on September 22, 2009. The popen API function in TSRM/tsrmwin32.c in PHP before 5.2.11 and 5.3.x before 5.3.1, when running on certain Windows operating systems, allows context-dependent attackers to cause a denial of service (crash) via a crafted (1) "e" or (2) "er" string in the second argument (aka mode), possibly…
When was CVE-2009-3294 disclosed?
CVE-2009-3294 was first published in the National Vulnerability Database on September 22, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-3294 actively exploited?
CVE-2009-3294 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 84.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-3294?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-3294, 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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