CVE-2024-33999 | moodle: unsafe direct use of $_SERVER['HTTP_REFERER'] in admin/tool/mfa/index.php

The referrer URL used by MFA required additional sanitizing, rather than being used directly.

Published: 2024-05-31 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-33999 is rated Moderate Risk (53.3/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.54%). Review affected assets and schedule remediation.

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-2024-33999

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 2026-06-15 0.81% 0.54% -0.27%
2 2026-01-30 0.62% 0.81% +0.19%
3 2025-12-28 — 0.62% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-33999

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:N)
No account or special rights needed—anonymous or random user is enough.
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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-33999

GitHub Security Advisory for CVE-2024-33999

GHSA-r2wx-46gp-rp3h · Severity: high · Ecosystem: composer — Moodle Improper Input Validation

OS Trackers for CVE-2024-33999

vendor priority summary link
ubuntu medium CVE-2024-33999 medium priority: Ubuntu including 1 source packages (moodle), 10 status rows across 10 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, upstream, xenial): DNE 7, needs-triage 3. https://ubuntu.com/security/CVE-2024-33999

Affected software / configurations for CVE-2024-33999

Vendor Product Version Raw CPE
moodle moodle >= 4.3.0, < 4.3.4 cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*

References for CVE-2024-33999

cvelogic Threat Intelligence