# CVE-2026-71957: D-Link DWR-M961 buffer overflow in app.cgi

Source: https://junglewise.ai/threats/cve-2026-71957-d-link-dwr-m961-buffer-overflow-in-app-cgi  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-08. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-71957 · Severity: critical · CVSS 9.8 · Published 2026-08-08

The D-Link DWR-M961 is a 4G LTE router used to provide mobile broadband connectivity to corporate and home networks. A buffer overflow vulnerability in the device's web management interface allows a remote attacker to send a specially crafted request that crashes the device or executes arbitrary commands, potentially compromising network security and availability.

Technologies: [D-Link DWR-M961](https://junglewise.ai/threats/technologies/dwr-m961). Vendors: [D-Link](https://junglewise.ai/threats/vendors/d-link).

## Quick answers

**Is CVE-2026-71957 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-71957 being exploited in the wild.

**How severe is CVE-2026-71957?** Critical severity, with a CVSS score of 9.8, published 8 August 2026.

**Which products and versions are affected?** D-Link DWR-M961 1.1.2_C1_202602110044 (hardware revision C1).

**Is there a fix for CVE-2026-71957?** A patch was published on 2026-07-07: Firmware version 1.1.5_C1_202607071108 resolves the vulnerability Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-71957 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-71957?** Check whether you run D-Link DWR-M961 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

A buffer overflow vulnerability exists in the app.cgi component of the D-Link DWR-M961 (hardware revision C1, firmware 1.1.2_C1_202602110044), specifically in the handling of the netAcc.addlist[].name parameter. The vulnerability allows a remote attacker to write an overly long string to this field without proper bounds checking, causing a stack or heap overflow. An attacker can exploit this via network access to the device's web management interface to either cause a denial of service (device crash) or execute arbitrary commands with device privileges. The vulnerability was resolved in firmware version 1.1.5_C1_202607071108.

## Affected products

- D-Link DWR-M961 1.1.2_C1_202602110044 (hardware revision C1)

## Timeline

- 2026-08-08: disclosed: CVE-2026-71957 published on NVD
- 2026-08-10: advisory: D-Link security announcement SAP10512 last updated
- 2026-07-07: patched: Firmware version 1.1.5_C1_202607071108 resolves the vulnerability

## References

- [https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10512](https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10512)
- [https://www.dlink.com/middle-east/en/products/dwr-m961-4g-ac1200-lte-router](https://www.dlink.com/middle-east/en/products/dwr-m961-4g-ac1200-lte-router)

## Related threats

- [D-Link DWR-M961 buffer overflow in quicksetup.cgi](https://junglewise.ai/threats/cve-2026-71958-d-link-dwr-m961-buffer-overflow-in-quicksetup-cgi)
- [D-Link DWR-M961 command injection in web-management CGI](https://junglewise.ai/threats/cve-2026-71956-d-link-dwr-m961-command-injection-in-web-management-cgi)
- [D-Link DWR-M961 command injection in formWsc](https://junglewise.ai/threats/cve-2026-71955-d-link-dwr-m961-command-injection-in-formwsc)
- [D-Link DWR-M961 command injection in L2TPv3 config](https://junglewise.ai/threats/cve-2026-71954-d-link-dwr-m961-command-injection-in-l2tpv3-config)
- [D-Link DWR-M961 command injection in NTP interface](https://junglewise.ai/threats/cve-2026-71953-d-link-dwr-m961-command-injection-in-ntp-interface)