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Response snapshot Oct 26, 2026, 22:36 UTC

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VulnerabilityCVE-2024-4577Known exploitation

PHP CGI argument injection on Windows

Windows character conversion can let unauthenticated requests inject PHP options and execute code in affected CGI configurations. DEVCORE verified Japanese CP932 among the affected locales; Talos later documented exploitation targeting organizations in Japan.

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
9.8 Critical (CVSS 3.1)
Chance of exploitation
100.0% in the next 30 days
CISA federal deadline
Jul 3, 2024: passed
Sources
4 independent sources

What to do

Install a current supported PHP security release and assess CGI exposure against DEVCORE's advisory. Remove unnecessary PHP CGI mappings; its locale-specific rewrite rule is only a temporary mitigation.

CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Read DEVCORE security advisory (opens a new tab)

CISA federal deadline

Federal due date passed

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Known
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

9.8

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

100.0%

Scored Percentile 100.0%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    DEVCORE security advisory (opens a new tab)

    Mechanism, verified Japanese locale, exposed-CGI scenarios, initial fixes, and mitigation limitations.

    Published Checked

  2. Primary source

    Cisco Talos: Unmasking the new persistent attacks on Japan (opens a new tab)

    Observed exploitation targeting Japan, credential theft, and use of the TaoWu Cobalt Strike toolkit.

    Published Checked

  3. Primary source

    CISA KEV JSON: CVE-2024-4577 (opens a new tab)

    This CVE's membership, addition date, federal due date, required action, and known ransomware-use field.

    Published Checked

  4. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2024-4577, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

  5. Primary source

    CVE Program CNA php (opens a new tab)

    The published CVE-2024-4577 document's CNA supplies this CVSS 3.1 base score, vector, and authoritative source update date.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2025, March 6). PHP CGI argument injection on Windows (CVE-2024-4577). https://kevwire.com/record/CVE-2024-4577

MLA

"PHP CGI argument injection on Windows (CVE-2024-4577)." KEVWire, 6 Mar. 2025, kevwire.com/record/CVE-2024-4577.

Chicago

KEVWire. "PHP CGI argument injection on Windows (CVE-2024-4577)." Last modified March 6, 2025. https://kevwire.com/record/CVE-2024-4577.

Evidence summary (plain text)

PHP CGI argument injection on Windows (Jun 6, 2024).
Windows character conversion can let unauthenticated requests inject PHP options and execute code in affected CGI configurations. DEVCORE verified Japanese CP932 among the affected locales; Talos later documented exploitation targeting organizations in Japan.
CVSS 9.8 (version 3.1; evidence as of Jun 21, 2024; https://cveawg.mitre.org/api/cve/CVE-2024-4577).
EPSS 100.0% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2024-4577&date=2026-10-26).
Sources:
DEVCORE security advisory: https://devco.re/blog/2024/06/06/security-alert-cve-2024-4577-php-cgi-argument-injection-vulnerability-en/
Cisco Talos: Unmasking the new persistent attacks on Japan: https://blog.talosintelligence.com/new-persistent-attacks-japan/
CISA KEV JSON: CVE-2024-4577: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2024-4577&date=2026-10-26
CVE Program CNA php: https://cveawg.mitre.org/api/cve/CVE-2024-4577
Record ID: CVE-2024-4577.
Record origin: Editorial selection.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
CISA federal due date: Jul 3, 2024. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was assembled editorially. Editorial review: Oct 26, 2026. Editorial selection does not make a reported claim independently confirmed.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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