{"basis":"claimed","id":"CVE-2025-43864","name":"React Router allows a DoS via cache poisoning by forcing SPA mode","vendorProject":"remix-run","product":"react-router","publishedAt":"2025-04-25","cvss":{"score":7.5,"severity":"HIGH","version":"3.1"},"exploited":null,"epss":{"score":0.20475,"percentile":0.97509,"date":"2026-11-02"},"coverage":{"cloudflare":{"status":"blocks","firstOn":"2025-04-26","daysToRule":1},"aws":{"status":"none","firstOn":null,"daysToRule":null},"azure":{"status":"none","firstOn":null,"daysToRule":null},"google":{"status":"none","firstOn":null,"daysToRule":null},"fastly":{"status":"no_history","firstOn":null,"daysToRule":null},"f5":{"status":"rule","firstOn":"2025-05-22","daysToRule":27},"akamai":{"status":"no_source","firstOn":null,"daysToRule":null},"crs":{"status":"none","firstOn":null,"daysToRule":null}},"title":"React Router allows a DoS via cache poisoning by forcing SPA mode","description":"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.","cwes":["CWE-755"],"vendors":[{"vendor":"cloudflare","status":"blocks","basis":"claimed","firstOn":"2025-04-26","firstIsNew":true,"daysToRule":1,"daysAtMost":null,"freePlan":false,"claims":[{"id":"9e9cc752aa57fb08d3c0e7d2ba21d4eaf0f760e20f1cdd58c7bf9fb82e3e8728","cve_id":"CVE-2025-43864","vendor":"cloudflare","product":"Cloudflare Managed Ruleset","rule_id":"54ea354d7f2d43c69b238d1419fcc883","rule_name":"React.js - Router and Remix Vulnerability - CVE:CVE-2025-43864, CVE:CVE-2025-43865","change":"new","default_action":"Block","published_on":"2025-04-26","source_url":"https://developers.cloudflare.com/changelog/post/2025-04-26-emergency-waf-release/","source_title":"WAF Release - 2025-04-26 - Emergency","excerpt":"React.js - Router and Remix Vulnerability - CVE:CVE-2025-43864, CVE:CVE-2025-43865. Previous action: Block. New action: Block. This is a New Detection","first_seen_at":"2026-11-02T21:00:16.558Z"}]},{"vendor":"aws","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"azure","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"google","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"fastly","status":"no_history","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"f5","status":"rule","basis":"claimed","firstOn":"2025-05-22","firstIsNew":true,"daysToRule":27,"daysAtMost":null,"freePlan":false,"claims":[{"id":"78730faa14e25767a3b11c24e936b49b62579e639f04fcba1ba3797533f64c47","cve_id":"CVE-2025-43864","vendor":"f5","product":"Attack signatures","rule_id":"200012093","rule_name":"React Router SPA Mode DoS","change":"new","default_action":null,"published_on":"2025-05-22","source_url":"https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog","source_title":"F5 Distributed Cloud attack signatures changelog","excerpt":"Added: signature 200012093 \"React Router SPA Mode DoS\" (Denial of Service, risk High), systems: Java Servlets/JSP, ReactJS. References: CVE-2025-43864.","first_seen_at":"2026-11-02T21:00:26.075Z"}]},{"vendor":"akamai","status":"no_source","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"crs","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]}],"updatedAt":"2026-11-02T21:17:16.628Z","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial"},"measured":[],"social":{"total":0,"first_seen":null,"daily":[{"day":"2026-10-21","posts":0},{"day":"2026-10-22","posts":0},{"day":"2026-10-23","posts":0},{"day":"2026-10-24","posts":0},{"day":"2026-10-25","posts":0},{"day":"2026-10-26","posts":0},{"day":"2026-10-27","posts":0},{"day":"2026-10-28","posts":0},{"day":"2026-10-29","posts":0},{"day":"2026-10-30","posts":0},{"day":"2026-10-31","posts":0},{"day":"2026-11-01","posts":0},{"day":"2026-11-02","posts":0},{"day":"2026-11-03","posts":0}],"top_posts":[],"exploit_repositories":[]}}