CVE-2025-66200 | Apache HTTP Server: mod_userdir+suexec bypass via AllowOverride FileInfo

mod_userdir+suexec bypass via AllowOverride FileInfo vulnerability in Apache HTTP Server. Users with access to use the RequestHeader directive in htaccess can cause some CGI scripts to run under an unexpected userid. This issue affects Apache HTTP Server: from 2.4.7 through 2.4.65. Users are recommended to upgrade to version 2.4.66, which fixes the issue.

Published: 2025-12-05 Last update: 2025-12-10 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-66200 is rated Low Risk (25.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.04%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-66200

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-02 0.06% 0.04% -0.02%
2 2026-02-11 0.05% 0.06% +0.01%
3 2026-01-28 — 0.05% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-66200

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.8 2.5 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-66200

OS Trackers for CVE-2025-66200

vendor priority summary link
alpine — CVE-2025-66200: 1 source package rows (apache2); 5 state rows across 5 repos (3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 5, open 0. https://security.alpinelinux.org/vuln/CVE-2025-66200
debian not yet assigned CVE-2025-66200 not yet assigned priority: Debian including 1 source packages (apache2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-66200
redhat medium — https://access.redhat.com/security/cve/CVE-2025-66200
suse medium CVE-2025-66200 severity moderate: SUSE including 318 source package names (2.1.3-4.26:wpa_supplicant-2.10-5.1, 2.1.3-4.27:wpa_supplicant-2.10-5.1, …), 534 product×package rows across 95 product lines (Container suse/manager/4.3/proxy-httpd, Container suse/manager/5.0/x86_64/proxy-httpd, … (95 product lines)): Fixed 295, Known Affected 231, First Fixed 7, Known Not Affected 1. https://www.suse.com/security/cve/CVE-2025-66200/
ubuntu medium CVE-2025-66200 medium priority: Ubuntu including 1 source packages (apache2), 9 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): needs-triage 4, released 4, ignored 1. https://ubuntu.com/security/CVE-2025-66200

Affected software / configurations for CVE-2025-66200

Vendor Product Version Raw CPE
apache http_server >= 2.4.7, < 2.4.66 cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

References for CVE-2025-66200

cvelogic Threat Intelligence