Is CVE-2012-4388 in the CISA KEV catalog?

No. CVE-2012-4388 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2012-4388?

CVE-2012-4388 has a CVSS v2 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2012-4388?

CVE-2012-4388 has an EPSS score of 4.23% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2012-4388?

Upgrade php to 5.3.11 or later.

CVE & CISA-KEV Catalog

CVE-2012-4388

MEDIUMEPSS 90th pctl

4.3

CVSS v2

NVD

Description

The sapi_header_op function in main/SAPI.c in PHP 5.4.0RC2 through 5.4.0 does not properly determine a pointer during checks for %0D sequences (aka carriage return characters), which allows remote attackers to bypass an HTTP response-splitting protection mechanism via a crafted URL, related to improper interaction between the PHP header function and certain browsers, as demonstrated by Internet Explorer and Google Chrome. NOTE: this vulnerability exists because of an incorrect fix for CVE-2011-1398.

CWE-20Improper Input Validation

How to fix

Remediation Available

phpNVD

Affected:>= 5.3.0, < 5.3.11Fixed in:5.3.11CVE-2012-4388derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

4.23%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Patch1

svn.php.net

Vendor Advisory1

bugs.php.net

Third-Party Advisory8

Other references1

article.gmane.org

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.