Quick answers
- Is CVE-2026-77893 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77893 being exploited in the wild.
- How severe is CVE-2026-77893?
- High severity, with a CVSS score of 7.5, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows DHCP Server.
- Is there a fix for CVE-2026-77893?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-77893 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-77893?
- Check whether you run Microsoft Windows DHCP Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An out-of-bounds read vulnerability exists in the Windows DHCP Server component that processes incoming DHCP protocol packets. The vulnerability can be triggered remotely over the network without authentication. An attacker can craft a malicious DHCP packet that causes the server to read memory beyond allocated bounds, leading to a denial-of-service condition (server crash). No code execution or privilege escalation is possible; the impact is limited to availability of the DHCP service.
Affected products
- Microsoft Windows DHCP Server
Timeline
- 2026-09-08: disclosed