# CVE-2026-90607: Totolink A3002MU buffer overflow in formNewSchedule

Source: https://junglewise.ai/threats/cve-2026-90607-totolink-a3002mu-buffer-overflow-in-formnewschedule  
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-2026-90607 · Severity: critical · CVSS 9.9 · Published 2026-09-14

The Totolink A3002MU router contains a buffer overflow vulnerability in its web management interface. An attacker can send a specially crafted request to crash the router's web server, causing the management interface to become unavailable. Since the router is typically accessible over the network, an unauthenticated attacker can exploit this vulnerability remotely to disrupt device management and operations.

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

## Quick answers

**Is CVE-2026-90607 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90607 being exploited in the wild.

**How severe is CVE-2026-90607?** 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-2026-90607?** 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-2026-90607 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-90607?** 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 boa web server's formNewSchedule function, triggered by improper validation of the submit-url parameter in HTTP POST requests to /boafrm/formNewSchedule. The vulnerable code uses unsafe string-copy logic to copy user-supplied input into a fixed-size buffer without enforcing length boundaries, allowing an oversized parameter value to overwrite adjacent memory. The attack requires network reachability to the router's web interface but does not require authentication. Successful exploitation crashes the boa process, achieving denial of service of the web management interface. The vulnerability is publicly disclosed with proof-of-concept code available.

## Affected products

- Totolink A3002MU Hh-B20211125.1046

## Timeline

- 2026-09-14: disclosed: Vulnerability published on NVD
- 2026-09-14: exploited: Exploit code made public via GitHub

## References

- [https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3002MU/bof-formNewSchedule.md](https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/ToTolink/A3002MU/bof-formNewSchedule.md)
- [https://vuldb.com/cve/CVE-2026-90607](https://vuldb.com/cve/CVE-2026-90607)

## 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)