Auth bypass in Totolink T6
CVE-2025-7862
A vulnerability has been found in TOTOLINK T6 4.1.5cu.748_B20211015 and classified as critical. Affected by this vulnerability is the function setTelnetCfg of the file /cgi-bin/cstecgi.cgi of the component Telnet Service. The manipulation of the argument telnet_enabled with the input 1 leads to missing authentication. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.011 (63.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.011 · change: +0.001
Affected products
- Totolink T6 — versions 3, 4.1.5cu.748_B20211015
- Totolink T6 Firmware — versions v4.1.5cu.748_b20211015
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/AnduinBrian/Public/blob/main/Totolink T6/Vuln/5.md (related, Exploit, Third Party Advisory)
- github.com/AnduinBrian/Public/blob/main/Totolink T6/Vuln/5.md (Exploit, Third Party Advisory, exploit)
- www.youtube.com/watch (Exploit, media-coverage)
- www.totolink.net/ (Product, product)
Frequently asked questions
- What is CVE-2025-7862?
- CVE-2025-7862 is a high-severity vulnerability in Totolink T6, classified under Improper Authentication. CVSS score: 7.3/10. Published 2025-07-20.
- How severe is CVE-2025-7862?
- High severity. CVSS v3 base score is 7.3 out of 10.