TOTOLINK A950RG 4.1.2cu.5268_B20221104 device-information udhcpd.leases getDeviceInfo MAC address command injection

Summaryinfo

A vulnerability was found in TOTOLINK A950RG 4.1.2cu.5268_B20221104. It has been classified as very critical. Affected is the function getDeviceInfo of the file /var/lib/misc/udhcpd.leases of the component device-information Handler. This manipulation of the argument MAC address causes command injection. This vulnerability appears as CVE-2026-116505. The attack may be initiated remotely. In addition, an exploit is available.

Detailsinfo

A vulnerability classified as very critical was found in TOTOLINK A950RG 4.1.2cu.5268_B20221104. Affected by this vulnerability is the function getDeviceInfo of the file /var/lib/misc/udhcpd.leases of the component device-information Handler. The manipulation of the argument MAC address with an unknown input leads to a command injection vulnerability. The CWE definition for the vulnerability is CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability.

It is possible to read the advisory at gist.github.com. This vulnerability is known as CVE-2026-116505. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are necessary for exploitation. Technical details and also a public exploit are known. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/26/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

It is possible to download the exploit at gist.github.com. It is declared as proof-of-concept.

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-110448). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• TOTOLINK

Name

• A950RG

Version

• 4.1.2cu.5268_B20221104

License

• commercial

Website

• Vendor: https://www.totolink.net/

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Accepted

• Submit #1022554: TOTOLINK A950RG V4.1.2cu.5268_B20221104 Command Injection (by LiuYijun_JX.SGCC)

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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