# CVE-2026-71343: Microsoft Windows Remote Access Connection Manager heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-71343-microsoft-windows-remote-access-connection-manager-heap-buffer  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-71343 · Severity: high · CVSS 7.8 · Published 2026-09-08

Windows Remote Access Connection Manager is a system component that manages remote access connections on Windows computers. A heap buffer overflow in this component allows an authorized local user to execute arbitrary code with elevated privileges, potentially compromising the entire system.

Technologies: [Microsoft Windows Remote Access Connection Manager](https://junglewise.ai/threats/technologies/windows-remote-access-connection-manager). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-71343 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-71343 being exploited in the wild.

**How severe is CVE-2026-71343?** High severity, with a CVSS score of 7.8, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows Remote Access Connection Manager.

**Is there a fix for CVE-2026-71343?** 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-2026-71343 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-71343?** Check whether you run Microsoft Windows Remote Access Connection Manager. 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

The vulnerability is a heap-based buffer overflow in the Windows Remote Access Connection Manager component. An authenticated local attacker can exploit this memory corruption flaw to execute arbitrary code with system-level privileges. The vulnerability requires local access and authentication; remote exploitation is not possible. Successful exploitation allows full system compromise. Microsoft has released security updates to address this issue.

## Affected products

- Microsoft Windows Remote Access Connection Manager

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71343](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71343)

## Related threats

- [Windows Remote Access Connection Manager improper access control](https://junglewise.ai/threats/cve-2026-70137-improper-access-control-in-windows-remote-access-connection)
- [Microsoft Windows Remote Access Connection Manager missing authorization](https://junglewise.ai/threats/cve-2026-72966-microsoft-windows-remote-access-connection-manager-missing)
- [Microsoft Windows Remote Access Connection Manager integer underflow](https://junglewise.ai/threats/cve-2026-71352-microsoft-windows-remote-access-connection-manager-integer)
- [Microsoft Windows Remote Access Connection Manager use-after-free privilege escalation](https://junglewise.ai/threats/cve-2026-71342-microsoft-windows-remote-access-connection-manager-use-after-free)
- [Microsoft Windows Remote Access Connection Manager use-after-free privilege escalation](https://junglewise.ai/threats/cve-2026-71333-microsoft-windows-remote-access-connection-manager-use-after-free)