Vulnerability · Published May 4, 2026 · Assigned by VulDB

CVE-2026-7747Totolink N300RH Parameter cstecgi.cgi loginauth buffer overflow

Critical 9.8

In plain English

A critical-severity buffer overflow in N300RH from Totolink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.6%top 50.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A security flaw has been discovered in Totolink N300RH 3.2.4-B20220812. Affected by this vulnerability is the function loginauth of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. Performing a manipulation of the argument Password results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.

Affected products (as reported)

Vendor	Product	Versions
Totolink	N300RH	3.2.4-B20220812

Weakness: CWE-120, CWE-119 · 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-360922 | Totolink N300RH Parameter cstecgi.cgi loginauth buffer overflow vdb-entry, technical-description
VDB-360922 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #807201 | Totolink N300RH N300RH V3_Firmware V3.2.4-B20220812 Buffer Overflow third-party-advisory
https://lavender-bicycle-a5a.notion.site/TOTOLINK-N300RH-loginauth_password-34553a41781f80c0ad36f4d95122fd40?pvs=73 exploit
https://www.totolink.net/ product