{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-39458","assignerOrgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","state":"PUBLISHED","assignerShortName":"f5","dateReserved":"2026-04-30T23:04:27.924Z","datePublished":"2026-05-13T14:12:42.079Z","dateUpdated":"2026-08-24T21:39:14.540Z"},"containers":{"cna":{"providerMetadata":{"orgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","shortName":"f5","dateUpdated":"2026-08-24T21:39:14.540Z"},"title":"BIG-IP DNS Cache vulnerability","datePublic":"2026-05-13T14:00:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-824","description":"CWE-824: Access of Uninitialized Pointer","type":"CWE"}]}],"affected":[{"vendor":"F5","product":"BIG-IP","modules":["All Modules"],"versions":[{"status":"unaffected","version":"21.1.0","lessThan":"*","versionType":"custom"},{"status":"affected","version":"21.0.0","lessThan":"21.0.0.1","versionType":"custom"},{"status":"affected","version":"17.5.0","lessThan":"17.5.1.6","versionType":"custom"},{"status":"affected","version":"17.1.0","lessThan":"17.1.3.2","versionType":"custom"},{"status":"affected","version":"16.1.0","lessThan":"*","versionType":"custom"}],"defaultStatus":"unknown"}],"descriptions":[{"lang":"en","value":"When a BIG-IP is configured with DNS caching  (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: 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);\">When a BIG-IP is configured with DNS caching  (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate.</span>&nbsp;Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}]}],"references":[{"url":"https://my.f5.com/manage/s/article/K000160945","tags":["vendor-advisory","patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":7.5,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","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":"HIGH","baseScore":8.7,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}}],"workarounds":[{"lang":"en","value":"CHANGE_ME","supportingMedia":[{"type":"text/html","base64":false,"value":"CHANGE_ME"}]}],"credits":[{"lang":"en","value":"F5","type":"finder"}],"source":{"discovery":"INTERNAL"},"x_generator":{"engine":"F5 SIRTBot v1.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T15:57:30.714703Z","id":"CVE-2026-39458","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-13T16:08:30.675Z"}}]}}