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Vulnerabilities

Vulnerability · CVE-2025-40552

CVE-2025-40552 is named in a Cloudflare managed-rules release.

Published Apr 7, 2026 · Cloudflare

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2025-40552 is not in CISA KEV. FIRST estimates a 52.00% chance of exploitation in the next 30 days. Check whether you run Cloudflare.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
52.00%
Remediation
Not established
Affected products
Cloudflare

CVE-2025-40552 is named in a Cloudflare managed-rules release.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2025-40552

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the cloudflare_waf record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-40552 is not in CISA KEV. FIRST estimates a 52.00% chance of exploitation in the next 30 days. Check whether you run Cloudflare.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 52.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 7, 2026 · Cloudflare WAF rules

    Detected

    CVE-2025-40552 is named in a Cloudflare managed-rules release.

Sources

Freshness

Last verified in this catalog Oct 25, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Cloudflare WAF rulesOct 25, 2026