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Vulnerabilities

Security fix · CVE-2025-43864

React Router is a router for React.

Published Apr 25, 2025 · catalog updated Apr 25, 2025 · React Router is a

Check this week

CVE-2025-43864 is not in CISA KEV. FIRST estimates a 20.47% chance of exploitation in the next 30 days. Check whether you run React Router is a.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (React Router is a).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
20.47%
Remediation
Version ranges on file
Affected products
vendor remix-run react-router 7.2.0, < 7.5.2

React Router is a router for React. Starting in version 7.2.0 and prior to version 7.5.2, it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that completely corrupts the page. If a cache system is in place, this allows the response containing the error to be cached, resulting in a cache poisoning that strongly impacts the availability of the application. This issue has been patched in version 7.5.2.

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.

  • vendor remix-run react-router 7.2.0, < 7.5.27.2.0, < 7.5.2

How to fix CVE-2025-43864

What to do

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

Should you patch?

CVE-2025-43864 is not in CISA KEV. FIRST estimates a 20.47% chance of exploitation in the next 30 days. Check whether you run React Router is a.

Which versions are affected?

Compare what you have installed with remix-run react-router 7.2.0, < 7.5.2 7.2.0, < 7.5.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 20.47%. 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. Apr 25, 2025 · EUVD

    Detected

    React Router is a router for React. Starting in version 7.2.0 and prior to version 7.5.2, it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that completely corrupts the page. If a cache system is in place, this allows the response containing the error to be cached, resulti

  2. Apr 25, 2025 · EUVD

    Updated

    React Router is a router for React. Starting in version 7.2.0 and prior to version 7.5.2, it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that completely corrupts the page. If a cache system is in place, this allows the response containing the error to be cached, resulti

Sources

  • CVE.orgVulnerability recordCVE-2025-43864

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-43864

    30-day exploitation probability 20.5%

    first.org
  • EUVDVulnerability recordEUVD-2025-11980

    React Router is a router for React. Starting in version 7.2.0 and prior to version 7.5.2, it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that complete

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.