{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-53521","assignerOrgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","state":"PUBLISHED","assignerShortName":"f5","dateReserved":"2025-10-03T23:04:38.083Z","datePublished":"2025-10-15T13:55:52.694Z","dateUpdated":"2026-03-31T16:04:27.360Z"},"containers":{"cna":{"providerMetadata":{"orgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","shortName":"f5","dateUpdated":"2026-03-31T16:04:27.360Z"},"title":"BigIP APM Vulnerability","datePublic":"2025-10-15T14:00:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-121","description":"CWE-121 Stack-based Buffer Overflow","type":"CWE"}]}],"affected":[{"vendor":"F5","product":"BIG-IP","modules":["APM"],"versions":[{"status":"affected","version":"17.5.0","lessThan":"17.5.1.3","versionType":"custom"},{"status":"affected","version":"17.1.0","lessThan":"17.1.3","versionType":"custom"},{"status":"affected","version":"16.1.0","lessThan":"16.1.6.1","versionType":"custom"},{"status":"affected","version":"15.1.0","lessThan":"15.1.10.8","versionType":"custom"}],"defaultStatus":"unknown"}],"descriptions":[{"lang":"en","value":"When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE).  \n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","supportingMedia":[{"type":"text/html","base64":false,"value":"<span style=\"background-color: rgb(255, 255, 255);\"><span style=\"background-color: rgb(255, 255, 255);\">When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE).</span>&nbsp;&nbsp;\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.\n\n</span>"}]}],"references":[{"url":"https://my.f5.com/manage/s/article/K000156741","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"CRITICAL","baseScore":9.8,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"version":"4.0","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","baseSeverity":"CRITICAL","baseScore":9.3,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}],"credits":[{"lang":"en","value":"F5 would like to thank Kristian Vlaardingerbroek, Hugo Trippaers, and other people of Schuberg Philis; Bart Vrancken; Fox-IT; and the National Cyber Security Centre (NCSC) in the Netherlands for their assistance in investigating this issue and following the highest standards of coordinated disclosure.","type":"finder"}],"source":{"discovery":"INTERNAL"},"x_generator":{"engine":"F5 SIRTBot v1.0"}},"adp":[{"references":[{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53521","tags":["government-resource"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-28T03:55:47.100165Z","id":"CVE-2025-53521","options":[{"Exploitation":"active"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}},{"other":{"type":"kev","content":{"dateAdded":"2026-03-27","reference":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53521"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-29T13:56:45.917Z"}}]}}