CVE-2011-1398

NONECVSS 0.0Weaponized
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 10%CVSS: —Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
—
EG Score
0.0(none)
EPSS
95.1%
KEV
Not listed

Published

August 30, 2012

Last Modified

April 29, 2026

References (20)

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp5 (5.3.10-1ubuntu3.4) @ precise2026-05-29ubuntu
redhatphp-0:5.1.6-43.el5_102013-12-11redhat
redhatphp53-0:5.3.3-21.el52013-09-30redhat
redhatphp-0:5.3.3-22.el62013-02-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:23 UTCEPSS rescore
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  1. 2026-06-17 17:49 UTCEPSS rescore
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  24. 2026-06-01 13:49 UTCEPSS rescore
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  26. 2026-05-31 22:28 UTCEPSS rescore
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  30. 2026-05-29 13:41 UTCEPSS rescore
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  32. 2026-05-29 03:07 UTCEG score recompute
  33. 2026-05-29 03:07 UTCVendor advisory
  34. 2026-05-29 03:07 UTCGHSA enrichment
  35. 2026-05-28 13:42 UTCEPSS rescore
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  38. 2026-05-27 13:38 UTCEPSS rescore
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  46. 2026-05-20 22:37 UTCEPSS rescore
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  52. 2026-05-18 21:29 UTCEPSS rescore
  53. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-37688✓ verified
    First seen Oct 6, 2011

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

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(4)

What is CVE-2011-1398?
CVE-2011-1398 is a none vulnerability published on August 30, 2012. The sapiheaderop 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…
When was CVE-2011-1398 disclosed?
CVE-2011-1398 was first published in the National Vulnerability Database on August 30, 2012, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-1398 actively exploited?
CVE-2011-1398 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2011-1398?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-1398, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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