CVE-2026-83869
CriticalCVSS 9.8Summary
Integer underflow (wrap or wraparound) in DNS Server allows an unauthorized attacker to execute code over a network.
Risk Assessment
An attacker can remotely execute code on the DNS server, potentially leading to service disruption and network compromise.
Recommendation
Install security updates for DNS Server and implement monitoring of DNS service integrity.
Other vulnerabilities in DNS Server
See all- CVE-2026-96113Critical
A heap-based buffer overflow in DNS Server allows an unauthorized attacker to execute code over a network. The vulnerability stems from improper memory handling during DNS query processing.
- CVE-2016-3227Critical
A use-after-free vulnerability in the DNS Server component in Microsoft Windows Server 2012 Gold and R2 allows remote attackers to execute arbitrary code via crafted requests.
- CVE-2026-69989High
Use after free in DNS Server allows an unauthorized attacker to execute code over a network.
- CVE-2026-69827High
Concurrent execution using shared resource with improper synchronization ('race condition') in DNS Server allows an unauthorized attacker to execute code over a network.
- CVE-2026-69782High
Race condition in DNS Server allows an unauthorized attacker to execute code over a network.
- CVE-2026-50426Medium
Relative path traversal vulnerability in DNS Server allows an authorized attacker to execute code over an adjacent network.
- CVE-2026-49169High
Use-After-Free vulnerability in DNS Server allows an authorized attacker to execute code remotely over the network. The issue stems from improper memory management when processing specially crafted DNS queries.
- CVE-2026-42000Medium
Insufficient validation of names during AXFR (DNS zone transfer) may allow an attacker to inject malicious or malformed data.
Original NVD description (English source)
Integer underflow (wrap or wraparound) in DNS Server allows an unauthorized attacker to execute code over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS