RCE in Totolink A7100ru
CVE-2026-5853
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.033 (87.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.143 · newest: 0.033 · change: -0.110
Affected products
- Totolink A7100ru — versions 7.4cu.2313_b20191024
Weakness classification (CWE)
References
- vuldb.com/vuln/356379 (technical-description, vdb-entry)
- vuldb.com/vuln/356379/cti (signature, permissions-required)
- vuldb.com/submit/791274 (third-party-advisory)
- github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_159/README.md (exploit)
- www.totolink.net/ (product)
Frequently asked questions
- What is CVE-2026-5853?
- CVE-2026-5853 is a critical-severity vulnerability in Totolink A7100ru, classified under Command Injection. CVSS score: 9.8/10. Published 2026-04-09.
- How severe is CVE-2026-5853?
- Critical severity. CVSS v3 base score is 9.8 out of 10.