CVE-2011-0753

CVE-2011-0753 is a medium-severity vulnerability in Php with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-362.

Key facts

• Severity: Medium (CVSS 2.0 base score 4.3)
• EPSS exploit prediction: 1% (52nd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-362
• Affected product: Php
• Published: 2011-02-02
• Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2011-0753?

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.

How severe is CVE-2011-0753?

CVE-2011-0753 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-0753 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-0753?

CVE-2011-0753 primarily affects Php. In total, 69 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-0753?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-0753 published?

CVE-2011-0753 was published on 2011-02-02 and last updated on 2026-06-16.

References

• http://bugs.php.net/52784
• http://www.php.net/ChangeLog-5.php
• https://exchange.xforce.ibmcloud.com/vulnerabilities/65431
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12271

Affected products (69)

• cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:1.0:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:2.0:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:2.0b10:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.9:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.10:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.11:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.12:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.13:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.14:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.15:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.16:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.17:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:3.0.18:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0:beta_4_patch1:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0:beta1:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0:beta2:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0:beta3:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0:beta4:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:4.1.2:*:*:*:*:*:*:*

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Other CWE-362 (Race Condition) vulnerabilities

• CVE-2022-27626 — Critical (CVSS 10.0): A vulnerability regarding concurrent execution using shared resource with improper synchronization ('Race Condition')…
• CVE-2015-8556 — Critical (CVSS 10.0): Local privilege escalation vulnerability in the Gentoo QEMU package before 2.5.0-r1.
• CVE-2014-0703 — Critical (CVSS 10.0): Cisco Wireless LAN Controller (WLC) devices 7.4 before 7.4.110.0 distribute Aironet IOS software with a race condition…
• CVE-2010-1228 — Critical (CVSS 10.0): Multiple race conditions in the sandbox infrastructure in Google Chrome before 4.1.249.1036 have unspecified impact and…
• CVE-2008-6598 — Critical (CVSS 10.0): Multiple race conditions in WANPIPE before 3.3.6 have unknown impact and attack vectors related to "bri restart logic."
• CVE-2026-46137 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: fix potential…

Browse all CWE-362 (Race Condition) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 221.161.235.168 (ipv4-addr)
• 187.141.71.166 (ipv4-addr)
• 103.20.122.54 (ipv4-addr)
• 82.199.197.245 (ipv4-addr)
• 58.221.244.34 (ipv4-addr)
• 222.99.52.202 (ipv4-addr)
• 220.88.220.59 (ipv4-addr)
• 211.253.10.61 (ipv4-addr)