Vulnerability · Published May 24, 2026 · Assigned by VulDB
CVE-2026-9404Totolink A8000RU Web Management cstecgi.cgi setDdnsCfg 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 1.7% (higher than 78% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)1.7%top 22.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. This affects the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument provider leads to os command injection. The attack may be launched remotely. The exploit is publicly available and might be used.
Affected products (as reported)
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-365385 | Totolink A8000RU Web Management cstecgi.cgi setDdnsCfg os command injection vdb-entry, technical-description
- VDB-365385 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
- Submit #813439 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection third-party-advisory
- https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_336/README.md exploit
- https://www.totolink.net/ product