Vulnerability · Published Apr 9, 2026 · Assigned by VulDB

CVE-2026-5853Totolink A7100RU CGI cstecgi.cgi setIpv6LanCfg os command injection

Critical 9.8

In plain English

A critical-severity OS command injection in A7100RU from Totolink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 13.7% (higher than 97% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)13.7%top 3.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this vulnerability is the function setIpv6LanCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument addrPrefixLen leads to os command injection. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.

Affected products (as reported)

Vendor	Product	Versions
Totolink	A7100RU	7.4cu.2313_b20191024

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-356379 | Totolink A7100RU CGI cstecgi.cgi setIpv6LanCfg os command injection vdb-entry, technical-description
VDB-356379 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
Submit #791274 | Totolink A7100RU 7.4cu.2313_b20191024 Command Injection third-party-advisory
https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_159/README.md exploit
https://www.totolink.net/ product