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Exploited vulnerability · CISA KEV

Is CVE-2024-38475 exploited? Yes: in CISA KEV since 1 May 2025

Gociux · Apache HTTP Server · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2024-38475, Apache HTTP Server Improper Escaping of Output Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 1 May 2025, 304 days after it was published. It affects Apache HTTP Server. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 1 May 2025
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.1CVSS 3.1 · critical
US federal due22 May 2025BOD 22-01 deadline

What it is

Apache HTTP Server contains an improper escaping of output vulnerability in mod_rewrite that allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure.

VendorApache (41 exploited CVEs in KEV)
ProductHTTP Server
VulnerabilityApache HTTP Server Improper Escaping of Output Vulnerability
WeaknessCWE-116
Published1 Jul 2024
Added to KEV1 May 2025
Reported by (CNA)apache

What to do

  1. Check whether you run it. Look for HTTP Server in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apache CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 1 Jul 2024.
  4. Get told next time. Email alerts when CISA adds a CVE for Apache.

Other exploited CVEs in HTTP Server

References

Questions

Is CVE-2024-38475 being exploited?

Yes. CISA added CVE-2024-38475 to the Known Exploited Vulnerabilities catalog on 1 May 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2024-38475 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2024-38475?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Apache's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected HTTP Server and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2025 · Apache scorecard · act-now radar.

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