Threat Intelligence / CVE / CVE-2012-1823

CVE-2012-1823 — redhat:enterprise_linux_server

CISA KEV

CVSS v3.1 9.8 (CRITICAL) · EPSS 94.3% (higher than 99.9% of all scored CVEs) · Priority 9/10 · Published 2012-05-11

As of 2025-11-04, CVE-2012-1823 is a CRITICAL-severity vulnerability in redhat:enterprise_linux_server, CVSS v3.1 9.8, EPSS 94.3% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2012-1823, most recently “APT35 (Charming Kitten) GCC Pre-Positioning Cyber Reconnaissance Campaign Enabling Kinetic Targeting”.

Last updated: 2025-11-04

What is CVE-2012-1823?

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.

The record classifies CVE-2012-1823 under weakness class CWE-77. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 17 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 5238 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST): 94.3% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
CISA KEV: Listed
Threadlinqs priority: 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published: 2012-05-11, last modified 2025-11-04

Is CVE-2012-1823 being exploited?

CISA added CVE-2012-1823 to the Known Exploited Vulnerabilities catalog, which means the agency holds evidence of exploitation in the wild. It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

Affected products and versions

(vendor unspecified): redhat:enterprise_linux_server, redhat:application_stack, redhat:enterprise_linux_eus, suse:linux_enterprise_software_development_kit, redhat:enterprise_linux_workstation, apple:mac_os_x, fedoraproject:fedora, opensuse:opensuse, redhat:enterprise_linux_server_aus, redhat:gluster_storage_server_for_on-premise, redhat:storage, suse:linux_enterprise_server, php:php, redhat:storage_for_public_cloud, redhat:enterprise_linux_desktop, debian:debian_linux, hp:hp-ux

How to fix CVE-2012-1823

No vendor patch reference has been recorded for CVE-2012-1823 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2012-1823

1 tracked threat in the Threadlinqs corpus references CVE-2012-1823, either in the campaign’s CVE list or as an indicator on the campaign record.

APT35 (Charming Kitten) GCC Pre-Positioning Cyber Reconnaissance Campaign Enabling Kinetic Targeting — CRITICAL · 2026-04-09

Sources

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2012-1823 are available via the Threadlinqs MCP server (Purple tier). View plans →

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