Is CVE-2026-90606 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-90606 being exploited in the wild.

How severe is CVE-2026-90606?

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-2026-90606?

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-2026-90606 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-90606?

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.

CVE-2026-90606: Totolink A3002MU buffer overflow in IPv6 setup

CVE-2026-90606 · Severity: critical · CVSS 9.9 · Published 2026-09-14

Totolink A3002MU is a wireless router used to provide internet connectivity for home and small office networks. A buffer overflow vulnerability in the router's web management interface allows a remote attacker to crash the web service by sending a specially crafted request with an excessively long IPv6 parameter, causing a denial of service and making the router inaccessible to administrators until reboot.

Technologies: TOTOLINK A3002MU. Vendors: TOTOLINK.

Quick answers

Is CVE-2026-90606 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-90606 being exploited in the wild.
How severe is CVE-2026-90606?: 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-2026-90606?: 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-2026-90606 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-90606?: 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 formIpv6Setup function of the Boa web server component (/boafrm/formIpv6Setup endpoint) in Totolink A3002MU firmware Hh-B20211125.1046. The vulnerability is triggered when the static_ipv6 parameter is processed without proper length validation, allowing an attacker to overwrite adjacent memory. The attack is network-reachable and requires only network access to the router's web interface (no authentication bypass needed if the interface is accessible). A remote attacker can send a crafted POST request with an oversized static_ipv6 value to crash the Boa process, resulting in denial of service. The vulnerability has been publicly disclosed with proof-of-concept code available.

Affected products

Totolink A3002MU Hh-B20211125.1046

Timeline

2026-09-14: disclosed: Vulnerability publicly disclosed with proof-of-concept
2026-09-14: other: CVE-2026-90606 assigned

References

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