RCE in Totolink A8000ru
CVE-2026-9387
A security flaw has been discovered in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument resetFlags results in os command injection. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.
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: 0.017 · newest: 0.033 · change: +0.015
Affected products
- Totolink A8000ru — versions 7.1cu.643_b20200521
Weakness classification (CWE)
References
- vuldb.com/vuln/365350 (technical-description, vdb-entry)
- vuldb.com/vuln/365350/cti (signature, permissions-required)
- vuldb.com/submit/813433 (third-party-advisory)
- github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_334/README.md (exploit)
- www.totolink.net/ (product)
Frequently asked questions
- What is CVE-2026-9387?
- CVE-2026-9387 is a critical-severity vulnerability in Totolink A8000ru, classified under Command Injection. CVSS score: 9.8/10. Published 2026-05-24.
- How severe is CVE-2026-9387?
- Critical severity. CVSS v3 base score is 9.8 out of 10.