{"id":"CVE-2026-83869","published":"2026-10-13T19:20:36.677","lastModified":"2026-10-16T16:21:40.227","description":"Integer underflow (wrap or wraparound) in DNS Server allows an unauthorized attacker to execute code over a network.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-191"],"vendors":["microsoft"],"products":["windows 10 1607","windows 10 1809","windows 10 21h2","windows 10 22h2","windows 11 23h2","windows 11 24h2","windows 11 25h2","windows 11 26h1","windows 11 26h2","windows server 2012","windows server 2016","windows server 2019"],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83869","tags":["Vendor Advisory"]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A DNS server vulnerability allows unauthorized attackers to execute code remotely through integer underflow, potentially leading to full system compromise.","exploitability":"Exploitation appears straightforward with no special preconditions required, as the vulnerability affects network-based DNS services.","blast_radius":"The impact could be severe across all systems relying on vulnerable DNS servers, potentially allowing attackers to gain complete control over affected infrastructure.","remediation":"No fixed version is published. Disable the affected DNS service or restrict access to the named endpoint until a patch is available.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["dns","rce","network"],"model":"garnet-coder","analyzedAt":"2026-10-14T08:49:47.683Z"}}