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2.9

TOTOLINK N600R login authentication uses predictable values

CVE-2026-82555 · published 2 months ago
Summary

The login process on the TOTOLINK N600R router does not generate sufficiently random numbers, making it easier for an attacker to guess authentication data. This weakness can be exploited from outside the network, though doing so is complex. Update the router firmware to the latest version or apply the vendor's security patch to restore proper randomness.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
totolink n600r 4.3.0cu.7866_B20220506
Original advisory text
TOTOLINK N600R Authentication cstecgi.cgi loginAuth random values
A vulnerability has been found in TOTOLINK N600R 4.3.0cu.7866_B20220506. This vulnerability affects the function loginAuth of the file /web_cste/cgi-bin/cstecgi.cgi of the component Authentication Handler. Such manipulation leads to insufficiently random values. It is possible to launch the attack remotely. This attack is characterized by high complexity. It is stated that the exploitability is difficult. The exploit has been disclosed to the public and may be used.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
2.9 Low
Exploitation
<1% chance of attack within 30 days
Type
CWE-330Use of Insufficiently Random Values
CWE-310Cryptographic Issues
Timeline
Published30 Aug 2026
Updated4 Nov 2026
First seen30 Aug 2026
Sources
CVE-2026-82555 · NVD
CVE-2026-82555 · MITRE
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