VULNERABILITY INTELLIGENCE

CVE-2012-4388

CVSS score4.3 MEDIUM
EPSS probability4.23%
CISA KEVNot currently listed
Published2012-09-07
Last modified2026-06-16
CVSS vectorAV:N/AC:M/Au:N/C:N/I:P/A:N

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.

Weakness classification

  • CWE-20: Improper Input Validation

Primary references