CVE-2026-83635
7.5HighPublished 13 Oct 2026 · NVD status: Analyzed · AI triage by gemini-3.8-flash
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Impact
- High impact on availability
- Weakness
- CWE-125
Impact
Remote, unauthenticated attackers can crash the DNS Server service and cause a denial of service. They only need network access to send malicious DNS queries to the server.
Root cause
An out-of-bounds read occurs when processing specially crafted DNS network packets.
Affected systems
Versions not listed — check the vendor advisory.
CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Fix & remediation
Install the relevant Microsoft security update from the MSRC advisory; if immediate patching is not possible, restrict network access to the DNS service (port 53 UDP/TCP) to trusted clients only via firewall rules.
AI-suggested. Run it in staging first and check it against the vendor advisory. Why?
NVD description
Out-of-bounds read in DNS Server allows an unauthorized attacker to deny service over a network.