VULNERABILITY INTELLIGENCE
CVE-2011-1398
CVSS score4.3 MEDIUM
EPSS probability10.17%
CISA KEVNot currently listed
Published2012-08-30
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 before 5.3.11 and 5.4.x before 5.4.0RC2 does not check 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.
Weakness classification
- CWE-20: Improper Input Validation