CVE-2011-1398

medium

Published 2012-08-30 · Modified 2026-04-29

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

5.3

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-37688 remote php verified

Mr. Tokumaru · 2011-10-06

PHP 5.3.11/5.4.0RC2 - 'header()' HTTP Header Injection

Source code queued for fetch — refresh in a moment.

Application impact

Vendor	Product	Versions
php	php	`{"endIncluding":"5.3.10"}`
php	php	`5.3.0`
php	php	`5.3.1`
php	php	`5.3.2`
php	php	`5.3.3`
php	php	`5.3.4`
php	php	`5.3.5`
php	php	`5.3.6`
php	php	`5.3.7`
php	php	`5.3.8`
php	php	`5.3.9`

References

CWEs

CWE-20

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.