Vulnerability · Published May 25, 2026 · Assigned by VulDB

CVE-2026-9477Totolink A8000RU Web Management cstecgi.cgi setAccessDeviceCfg os command injection

Critical 9.8

In plain English

A critical-severity OS command injection in A8000RU from Totolink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 80% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.9%top 20.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A security flaw has been discovered in Totolink A8000RU 7.1cu.643_b20200521. This issue affects the function setAccessDeviceCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument mac results in os command injection. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks.

Affected products (as reported)

Vendor	Product	Versions
Totolink	A8000RU	7.1cu.643_b20200521

Weakness: CWE-78, CWE-77 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-365458 | Totolink A8000RU Web Management cstecgi.cgi setAccessDeviceCfg os command injection vdb-entry, technical-description
VDB-365458 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
Submit #813460 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection third-party-advisory
https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_349/README.md exploit
https://www.totolink.net/ product