# CVE-2026-100740: D-Link DIR-895L out-of-bounds write in L2TP parser

Source: https://junglewise.ai/threats/cve-2026-100740-a-vulnerability-was-detected-in-d-link-dir-895l-a1-102b07  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-27. Updated: 2026-09-27  
License: CC BY 4.0 with a link back

CVE-2026-100740 · Severity: critical · CVSS 9.9 · Published 2026-09-27

The D-Link DIR-895L router contains an out-of-bounds write vulnerability in its L2TP (Layer 2 Tunneling Protocol) parser that can be exploited remotely without authentication. An attacker can send specially crafted L2TP control channel packets to crash the router or potentially execute arbitrary code, disrupting network connectivity and creating a foothold for further compromise. The vulnerability has been publicly disclosed and may be actively exploited.

Technologies: [D-Link DIR-895L](https://junglewise.ai/threats/technologies/dir-895l). Vendors: [D-Link](https://junglewise.ai/threats/vendors/d-link).

## Quick answers

**Is CVE-2026-100740 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100740 being exploited in the wild.

**How severe is CVE-2026-100740?** Critical severity, with a CVSS score of 9.9, published 27 September 2026.

**Which products and versions are affected?** D-Link DIR-895L A1_102b07.

**Is there a fix for CVE-2026-100740?** 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-2026-100740 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-100740?** Check whether you run D-Link DIR-895L 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 of tunnel.c in the L2TP Control Channel Parser component, allowing out-of-bounds write through improper handling of L2TP packets. The attack requires only network connectivity with no authentication or user interaction, and can result in denial of service or code execution depending on memory layout. A fix is assumed to be available through D-Link firmware updates.

## Affected products

- D-Link DIR-895L A1_102b07

## Timeline

- 2026-09-27: disclosed: Public disclosure of CVE-2026-100740

## References

- [https://tzh00203.notion.site/D-Link-DIR-895L-L2TP-Host-Name-AVP-Out-of-Bounds-Write-33cb5c52018a8061b139cacc39d58fff](https://tzh00203.notion.site/D-Link-DIR-895L-L2TP-Host-Name-AVP-Out-of-Bounds-Write-33cb5c52018a8061b139cacc39d58fff)
- [https://vuldb.com/cve/CVE-2026-100740](https://vuldb.com/cve/CVE-2026-100740)

## Related threats

- [D-Link DIR-895L stack-based buffer overflow in udhcpcd](https://junglewise.ai/threats/cve-2026-86509-d-link-dir-895l-stack-based-buffer-overflow-in-udhcpcd)
- [D-Link DIR-895L command injection in udhcpcd sendACK](https://junglewise.ai/threats/cve-2026-86295-d-link-dir-895l-command-injection-in-udhcpcd-sendack)