# CVE-2026-96891: D-Link DIR-825 out-of-bounds write in L2TP hostname parsing

Source: https://junglewise.ai/threats/cve-2026-96891-a-vulnerability-was-identified-in-d-link-dir-825-3-00b32-affected  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-96891 · Severity: critical · CVSS 9.8 · Published 2026-09-24

The D-Link DIR-825 router contains a vulnerability in its L2TP (Layer 2 Tunneling Protocol) implementation that allows remote attackers to write data beyond allocated memory boundaries. An attacker can exploit this by sending specially crafted L2TP packets with a malicious hostname parameter, potentially leading to code execution and complete compromise of the router.

Vendors: [D-Link](https://junglewise.ai/threats/vendors/d-link).

## Quick answers

**Is CVE-2026-96891 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-96891 being exploited in the wild.

**How severe is CVE-2026-96891?** Critical severity, with a CVSS score of 9.8, published 24 September 2026.

**Which products and versions are affected?** D-Link DIR-825 3.00b32.

**Is there a fix for CVE-2026-96891?** 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-2026-96891 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-96891?** Check whether you run D-Link DIR-825 at an affected version. 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 exists in the tunnel_set_params function within tunnel.c of the rp-l2tp component, where insufficient bounds checking on the peer_hostname argument enables out-of-bounds write. The flaw is remotely exploitable without authentication. Successful exploitation could allow arbitrary code execution with router-level privileges.

## Affected products

- D-Link DIR-825 3.00b32

## Timeline

- 2026-09-24: disclosed

## References

- [https://tzh00203.notion.site/D-Link-DIR-825-L2TP-Host-Name-AVP-Out-of-Bounds-Write-33cb5c52018a80458ffec58b62096940](https://tzh00203.notion.site/D-Link-DIR-825-L2TP-Host-Name-AVP-Out-of-Bounds-Write-33cb5c52018a80458ffec58b62096940)
- [https://vuldb.com/cve/CVE-2026-96891](https://vuldb.com/cve/CVE-2026-96891)