Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 Boa formIpv6Setup static_dns1 stack-based overflow

Summaryinfo

A vulnerability labeled as very critical has been found in Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. This impacts the function formIpv6Setup of the component Boa. Such manipulation of the argument static_dns1 leads to stack-based overflow. This vulnerability is referenced as CVE-2026-42021. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. It has been rated as very critical. Affected by this issue is the function formIpv6Setup of the component Boa. The manipulation of the argument static_dns1 with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability. CVE summarizes:

Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup static network configuration functionality of Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities. This vulnerability concerns the static_dns1 parameter.

The advisory is available at talosintelligence.com. This vulnerability is handled as CVE-2026-42021 since 04/23/2026. The exploitation is known to be easy. The attack may be launched remotely. The exploitation requires an enhanced level of successful authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/21/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Totolink

Name

• X2000R

Version

• TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327

License

• commercial

Website

• Vendor: https://www.totolink.net/

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