# CVE-2026-83667: Microsoft Active Directory Domain Services out-of-bounds read

Source: https://junglewise.ai/threats/cve-2026-83667-out-of-bounds-read-in-active-directory-domain-services-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-83667 · Severity: medium · CVSS 6.5 · Published 2026-10-13

Active Directory Domain Services, which manages user identities and permissions across enterprise networks, contains an out-of-bounds memory read vulnerability. An authenticated attacker on the network can exploit this flaw to crash the Active Directory service, causing a denial of service that affects business operations depending on authentication and directory lookups.

Technologies: [Microsoft Active Directory Domain Services](https://junglewise.ai/threats/technologies/active-directory-domain-services). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-83667 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-83667 being exploited in the wild.

**How severe is CVE-2026-83667?** Medium severity, with a CVSS score of 6.5, published 13 October 2026.

**Which products and versions are affected?** Microsoft Active Directory Domain Services.

**Is there a fix for CVE-2026-83667?** 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-2026-83667 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-83667?** Check whether you run Microsoft Active Directory Domain Services. 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 in Active Directory Domain Services allows an authenticated network attacker to trigger a denial-of-service condition. The vulnerability requires valid network access and authentication to the directory service. Exploitation results in service disruption but does not lead to code execution or data exfiltration.

## Affected products

- Microsoft Active Directory Domain Services

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83667](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83667)

## Related threats

- [Microsoft Active Directory Domain Services authentication bypass](https://junglewise.ai/threats/cve-2026-118735-weak-authentication-in-active-directory-domain-services-allows)
- [Microsoft Active Directory Domain Services privilege elevation](https://junglewise.ai/threats/cve-2026-118148-improper-authentication-in-active-directory-domain-services)
- [Microsoft Active Directory Domain Services authorization bypass](https://junglewise.ai/threats/cve-2026-118146-incorrect-authorization-in-active-directory-domain-services)
- [Microsoft Active Directory Domain Services out-of-bounds read](https://junglewise.ai/threats/cve-2026-105568-out-of-bounds-read-in-active-directory-domain-services-allows-an)
- [Microsoft Active Directory Domain Services out-of-bounds write](https://junglewise.ai/threats/cve-2026-88165-out-of-bounds-write-in-active-directory-domain-services-allows-an)