CVE-2011-0753

4.3 MEDIUM 0.8% exploit odds Fix listed

What it is

Race condition in the PCNTL extension in PHP before 5.3.4, when a user-defined signal handler exists, might allow context-dependent attackers to cause a denial of service (memory corruption) via a large number of concurrent signals.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 0.8% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2011-02-02 22:00 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:28 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.8% in the next 30 days (EPSS).
Severity: 4.3 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2011-02-02 22:00 UTC
Last modified: 2026-06-16 23:28 UTC
Exploit probability: 0.8% · EPSS, next 30 days
Weakness: CWE-362 · Race condition
Record status: Modified

Affected

PHP ≤ 5.3.3
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 · 4.3

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

Raw vector

AV:N/AC:M/Au:N/C:N/I:N/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-2011-0753.md and follow it. Check whether this project is affected by CVE-2011-0753. 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