CVE-2009-3558

6.8 MEDIUM 2% exploit odds Fix listed

What it is

The posix_mkfifo function in ext/posix/posix.c in PHP before 5.2.12 and 5.3.x before 5.3.1 allows context-dependent attackers to bypass open_basedir restrictions, and create FIFO files, via the pathname and mode arguments, as demonstrated by creating a .htaccess file.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 2.1% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2009-11-23 17:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:11 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 2.1% in the next 30 days (EPSS).
Severity: 6.8 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2009-11-23 17:30 UTC
Last modified: 2026-06-16 23:11 UTC
Exploit probability: 2.1% · EPSS, next 30 days
Weakness: CWE-264
Record status: Modified

Affected

PHP ≤ 5.2.10
PHP 1.0
PHP 2.0
PHP 2.0b10
PHP 3.0
PHP 3.0.1
PHP 3.0.2
PHP 3.0.3

Attack profile CVSS 2.0 · 6.8

Attack vector: Network
Complexity: Medium
Authentication: None
Confidentiality: Partial
Integrity: Partial
Availability: Partial

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2009-3558.md and follow it. Check whether this project is affected by CVE-2009-3558. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record