ExploitedIn CISA KEVFix available

CVE-2012-1823

Q: Is CVE-2012-1823 actively exploited?

Yes. CVE-2012-1823 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-04-15.

Q: What is the CVSS score for CVE-2012-1823?

CVE-2012-1823 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exploitation confirmed. First attested on 2022-03-25 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2012-05-11
WeaknessCWE-77

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

sapi/cgi/cgi_main.c in PHP before 5.3.12 and 5.4.x before 5.4.2, when configured as a CGI script (aka php-cgi), does not properly handle query strings that lack an = (equals sign) character, which allows remote attackers to execute arbitrary code by placing command-line options in the query string, related to lack of skipping a certain php_getopt for the 'd' case.

Timeline

dates in UTC

2012-05-1110:15CVE publishedNVD
2022-03-25Listed as exploited by GCVEGCVE
2022-03-25Exploitation first reportedCISA KEV
2022-03-25Added to the CISA KEV catalogCISA KEV
2025-02-0713:10SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2012-1823?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2012-1823?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Redhat enterprise linux eus

Branch	Affected	Fixed in	Source
5.6	= 5.6	no fix published	NVD
6.1	= 6.1	no fix published	NVD
6.2	= 6.2	no fix published	NVD

Apple mac os x

Branch	Affected	Fixed in	Source
10.8	≥ 10.8.0, < 10.8.2	10.8.2	NVD
10.x	≥ 10.6.8, < 10.7.5	10.7.5	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
39.x	= 39	no fix published	NVD
40.x	= 40	no fix published	NVD

14 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

CISA’s required action: Apply updates per vendor instructions.due 2022-04-15

Advisories and patches

www.php.netPatch · Release Notes
www.php.netRelease Notes
bugs.php.netPatch
bugs.php.netPatch
lists.fedoraproject.orgRelease Notes
lists.fedoraproject.orgRelease Notes

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 16 repositories, unverifieddrone789/CVE-2012-1823tardummy01/oscp_scripts-1Unix13/metasploitable2cyberharsh/PHP_CVE-2012-18230xl0k1/CVE-2012-1823

CISA Known Exploited Vulnerability

Date Added: 2022-03-25
Patch Due Date: 2022-04-15
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2022-03-25
GCVEexploitation2022-03-25
CISA-ADPSSVC decisionactive2025-02-07
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.19.82025-02-07
NVDCVSS 2.07.5read 2026-10-23
CISA-ADPweakness (CWE)CWE-772025-02-07
NVDweakness (CWE)CWE-77read 2026-10-23
FIRST EPSSEPSS score99.9 %read 2026-10-23
PoC-in-GitHubproof of concept16read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2012-05-11
Last Modified: 2026-06-16
NVD status: Analyzed

Frequently asked questions

What is CVE-2012-1823?

Is CVE-2012-1823 actively exploited?

Yes. CVE-2012-1823 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-04-15.

What is the CVSS score for CVE-2012-1823?

CVE-2012-1823 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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