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Vulnerability record · CVE-2026-7749 · published 4 May 2026

CVE-2026-7749: Memory buffer overflow vulnerability

A security vulnerability has been detected in Totolink N300RH 3.2.4-B20220812. This affects the function setWanConfig of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. The manipulation of the argument priDns leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

7.4 CVSS 4.0 High EPSS 0.79% · top 45.5% CWE-119 · Memory buffer overflowCWE-120 · Classic buffer overflow Deferred
7.4CVSS 4.0 base score, v2 9.0
0.79%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

Description

A security vulnerability has been detected in Totolink N300RH 3.2.4-B20220812. This affects the function setWanConfig of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. The manipulation of the argument priDns leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://lavender-bicycle-a5a.notion.site/TOTOLINK-N300RH-setWanConfig-34553a41781f80ed8500d9b8d54074f2
https://vuldb.com/submit/807203
https://vuldb.com/vuln/360924
https://vuldb.com/vuln/360924/cti
https://www.totolink.net/

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Source: NIST National Vulnerability Database (record CVE-2026-7749), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.