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Vulnerabilities

Vulnerability · CVE-2025-7783

Use of Insufficiently Random Values vulnerability in form-data allows HTTP Parameter Pollution (HPP).

Published Jul 18, 2025 · catalog updated Nov 3, 2025 · Cloudflare

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

Check if you run it

No confirmed exploitation is on record for CVE-2025-7783. EPSS is 1.81%. Act only if a listed version of Cloudflare is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.81%
Remediation
Version ranges on file
Affected products
stated harborist · vendor harborist

Use of Insufficiently Random Values vulnerability in form-data allows HTTP Parameter Pollution (HPP). This vulnerability is associated with program files lib/form_data.Js. This issue affects form-data: < 2.5.4, 3.0.0 - 3.0.3, 4.0.0 - 4.0.3.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated harborist< 2.5.4
  • vendor harboristversion unspecified

How to fix CVE-2025-7783

What to do

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

Should you patch?

No confirmed exploitation is on record for CVE-2025-7783. EPSS is 1.81%. Act only if a listed version of Cloudflare is installed.

Which versions are affected?

Compare what you have installed with < 2.5.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.81%. 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.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 18, 2025 · EUVD

    Detected

    Use of Insufficiently Random Values vulnerability in form-data allows HTTP Parameter Pollution (HPP). This vulnerability is associated with program files lib/form_data.Js. This issue affects form-data: < 2.5.4, 3.0.0 - 3.0.3, 4.0.0 - 4.0.3.

  2. Nov 3, 2025 · EUVD

    Updated

    Use of Insufficiently Random Values vulnerability in form-data allows HTTP Parameter Pollution (HPP). This vulnerability is associated with program files lib/form_data.Js. This issue affects form-data: < 2.5.4, 3.0.0 - 3.0.3, 4.0.0 - 4.0.3.

Sources

  • Cloudflare WAF rulesVendor advisoryCVE-2025-7783

    CVE-2025-7783 is named in a Cloudflare managed-rules release. The default action recorded for those rules is Block.

    developers.cloudflare.com
  • CVE.orgVulnerability recordCVE-2025-7783

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-7783

    30-day exploitation probability 1.81%

    first.org
  • EUVDVulnerability recordEUVD-2025-21906

    Use of Insufficiently Random Values vulnerability in form-data allows HTTP Parameter Pollution (HPP). This vulnerability is associated with program files lib/form_data.Js. This issue affects form-data: < 2.5.4, 3.0.0 - 3.0.3, 4.0.0 - 4.0.3.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 23, 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
  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 20, 2026