What is CVE-2026-4976?

CVE-2026-4976 is a high-severity vulnerability in Totolink Lr350, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-03-27.

How severe is CVE-2026-4976?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Totolink Lr350

CVE-2026-4976

A vulnerability was found in Totolink LR350 9.3.5u.6369_B20220309. This vulnerability affects the function setWiFiGuestCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument ssid results in buffer overflow. The attack can b…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (37.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.

Affected products

Totolink Lr350 — versions 9.3.5u.6369_B20220309

Weakness classification (CWE)

References

VDB-353863 | Totolink LR350 cstecgi.cgi setWiFiGuestCfg buffer overflow (vdb-entry, technical-description)
VDB-353863 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #778274 | TOTOLINK LR350 LR350 V9.3.5u.6369_B20220309 Buffer Overflow (third-party-advisory)
lavender-bicycle-a5a.notion.site/TOTOLINK-LR350-setWiFiGuestCfg-32153a41781f804… (exploit)
www.totolink.net/ (product)

Frequently asked questions

What is CVE-2026-4976?: CVE-2026-4976 is a high-severity vulnerability in Totolink Lr350, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2026-03-27.
How severe is CVE-2026-4976?: High severity. CVSS v3 base score is 8.8 out of 10.