# CVE-2026-90605: Totolink A3002MU buffer overflow in formFilter

Source: https://junglewise.ai/threats/cve-2026-90605-totolink-a3002mu-buffer-overflow-in-formfilter  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-14. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-90605 · Severity: critical · CVSS 9.9 · Published 2026-09-14

The Totolink A3002MU wireless router contains a memory corruption vulnerability in its web management interface. An unauthenticated attacker on the network can send a specially crafted HTTP request to crash the router's web server and temporarily take the device offline, preventing legitimate users from accessing management functions or internet connectivity.

Technologies: [TOTOLINK A3002MU](https://junglewise.ai/threats/technologies/a3002mu). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-90605 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90605 being exploited in the wild.

**How severe is CVE-2026-90605?** Critical severity, with a CVSS score of 9.9, published 14 September 2026.

**Which products and versions are affected?** TOTOLINK A3002MU Hh-B20211125.1046.

**Is there a fix for CVE-2026-90605?** 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-2026-90605 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-90605?** Check whether you run TOTOLINK A3002MU 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 /bin/boa web server's formFilter function, specifically in the handling of the ip6addr parameter. The vulnerable code uses unsafe string-copy operations (strcpy) without proper length validation, allowing an attacker to send an oversized IPv6 address value via POST request to /boafrm/formFilter. No authentication is required; the attack vector is purely network-based. Successful exploitation overwrites adjacent memory and crashes the Boa process, resulting in denial of service. A proof-of-concept exploit has been publicly disclosed.

## Affected products

- Totolink A3002MU Hh-B20211125.1046

## Timeline

- 2026-09-14: disclosed: CVE-2026-90605 published; exploit proof-of-concept made public

## References

- [https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3002MU/bof-formFilter.md](https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3002MU/bof-formFilter.md)
- [https://vuldb.com/cve/CVE-2026-90605](https://vuldb.com/cve/CVE-2026-90605)

## Related threats

- [Totolink A3002MU path traversal in file upload handler](https://junglewise.ai/threats/cve-2026-105286-a-vulnerability-was-detected-in-totolink-a3002mu-1-0-0-b20230403)
- [Totolink A3002MU stack buffer overflow in QoS handler](https://junglewise.ai/threats/cve-2026-105285-a-security-vulnerability-has-been-detected-in-totolink-a3002mu-1)
- [Totolink A3002MU authentication bypass in bin/boa](https://junglewise.ai/threats/cve-2026-105284-a-weakness-has-been-identified-in-totolink-a3002mu-1-0-0)
- [Totolink A3002MU command injection in formWsc](https://junglewise.ai/threats/cve-2026-93742-a-weakness-has-been-identified-in-totolink-a3002mu-hh-b20211125)
- [Totolink A3002MU buffer overflow in formWlWds](https://junglewise.ai/threats/cve-2026-93741-a-security-flaw-has-been-discovered-in-totolink-a3002mu-hh)