What’s Vulnerable › Vulnerabilities

CVE-2022-4900: Potential buffer overflow in php_cli_server_startup_workers

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-02 · updated 2026-06-17
• Weakness: CWE-119

Description

A vulnerability was found in PHP where setting the environment variable PHP_CLI_SERVER_WORKERS to a large value leads to a heap buffer overflow.

Affected products

• PHP: before 8.0.22 — fixed in 8.0.22
• Red Hat Enterprise Linux: 6.0, 7.0, 8.0, 9.0
• RedHat Software Collections: all versions

How to fix

Upgrade to a fixed version: PHP 8.0.22. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2022-4900
• https://bugzilla.redhat.com/show_bug.cgi?id=2179880
• https://security.netapp.com/advisory/ntap-20231130-0008/
• https://access.redhat.com/security/cve/CVE-2022-4900
• https://bugzilla.redhat.com/show_bug.cgi?id=2179880
• https://lists.debian.org/debian-lts-announce/2024/10/msg00011.html
• https://security.netapp.com/advisory/ntap-20231130-0008/

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