What is CVE-2022-4900?

CVE-2022-4900 is a medium-severity vulnerability in PHP, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.2/10. Published 2023-11-02.

How severe is CVE-2022-4900?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Buffer overflow in PHP

CVE-2022-4900

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.

Vulnerability class: Buffer Overflow

Published 2023-11-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (28.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

PHP
Fedora
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Software Collections
Red Hat Enterprise Linux — versions 6.0, 7.0, 8.0
Red Hat Software Collections
PHP — versions 8.0.22

Weakness classification (CWE)

References

access.redhat.com/security/cve/CVE-2022-4900 (vdb-entry, Vendor Advisory)
bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking)
security.netapp.com/advisory/ntap-20231130-0008/ (Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2022-4900?: CVE-2022-4900 is a medium-severity vulnerability in PHP, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.2/10. Published 2023-11-02.
How severe is CVE-2022-4900?: Medium severity. CVSS v3 base score is 6.2 out of 10.