{"id":"CVE-2026-9030","state":"PUBLISHED","title":"Authenticated Denial-of-Service in HTTPD Service in TP-Link Archer A6","description":"A denial-of-service\nvulnerability exists in httpd service on Archer A6 v4 where the asynchronous systool\ninstruction handlng path in httpd does not properly synchronize or safely manage\nconcurrent systool operations.  \n\n\n\n\n\nBy sending\ncrafted systool instructions through the asynchronous request path, successful\nexploitation may cause the httpd process or device management service to crash\nand may result in temporary loss of access to the web management interface or\ndevice reboot.","publishedAt":"2026-08-07T20:38:35.116Z","updatedAt":"2026-08-10T18:23:58.299Z","severity":{"score":6.8,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"TPLink"},"assigner":"TPLink","products":["TP-Link Systems Inc. Archer A6 v4"],"affected":[{"vendor":"TP-Link Systems Inc.","product":"Archer A6 v4","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"V4_1.15.10 Build 260625 Rel.25447","versionType":"custom"}],"modules":["httpd"]}],"references":["https://www.tp-link.com/us/support/download/archer-a6/v4/#Firmware","https://www.tp-link.com/en/support/download/archer-a6/v4/#Firmware","https://www.tp-link.com/en/support/faq/5234/"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-29T20:13:52.441Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/9xxx/CVE-2026-9030.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-9030","state":"PUBLISHED","datePublished":"2026-08-07T20:38:35.116Z","dateUpdated":"2026-08-10T18:23:58.299Z","assignerShortName":"TPLink","assignerOrgId":"f23511db-6c3e-4e32-a477-6aa17d310630","dateReserved":"2026-05-19T16:30:33.339Z"},"containers":{"cna":{"title":"Authenticated Denial-of-Service in HTTPD Service in TP-Link Archer A6","descriptions":[{"lang":"en","value":"A denial-of-service\nvulnerability exists in httpd service on Archer A6 v4 where the asynchronous systool\ninstruction handlng path in httpd does not properly synchronize or safely manage\nconcurrent systool operations.  \n\n\n\n\n\nBy sending\ncrafted systool instructions through the asynchronous request path, successful\nexploitation may cause the httpd process or device management service to crash\nand may result in temporary loss of access to the web management interface or\ndevice reboot."}],"affected":[{"vendor":"TP-Link Systems Inc.","product":"Archer A6 v4","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"V4_1.15.10 Build 260625 Rel.25447","versionType":"custom"}],"modules":["httpd"]}],"references":[{"url":"https://www.tp-link.com/us/support/download/archer-a6/v4/#Firmware","tags":["patch"]},{"url":"https://www.tp-link.com/en/support/download/archer-a6/v4/#Firmware","tags":["patch"]},{"url":"https://www.tp-link.com/en/support/faq/5234/","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"HIGH","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":6.8,"vectorString":"CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization","type":"CWE"}]}],"providerMetadata":{"shortName":"TPLink","orgId":"f23511db-6c3e-4e32-a477-6aa17d310630","dateUpdated":"2026-08-07T20:52:28.967Z"},"impacts":[{"capecId":"CAPEC-125","descriptions":[{"lang":"en","value":"CAPEC-125 Flooding"}]}],"credits":[{"lang":"en","value":"Dariusz Gońda","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-10T17:28:38.437749Z","id":"CVE-2026-9030","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-10T18:23:58.299Z"}}]}}}