What is CVE-2025-5902?

CVE-2025-5902 is a high-severity vulnerability in Totolink T10, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-06-09.

How severe is CVE-2025-5902?

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

Buffer overflow in Totolink T10

CVE-2025-5902

A vulnerability was found in TOTOLINK T10 4.1.8cu.5207 and classified as critical. This issue affects the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. The manipulation of the argument slaveI…

Vulnerability class: Buffer Overflow

EPSS: 0.014 (80.9th 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 T10 — versions 4.1.8cu.5207

Weakness classification (CWE)

References

VDB-311675 | TOTOLINK T10 POST Request cstecgi.cgi setUpgradeFW buffer overflow (vdb-entry, technical-description)
VDB-311675 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #592246 | TOTOLINK T10 V2_Firmware V2_V4.1.8cu.5207 Buffer Overflow (third-party-advisory)
candle-throne-f75.notion.site/TOTOLINK-T10-setUpgradeFW-20bdf0aa11858089bc28f63… (exploit, patch)
www.totolink.net/ (product)

Frequently asked questions

What is CVE-2025-5902?: CVE-2025-5902 is a high-severity vulnerability in Totolink T10, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-06-09.
How severe is CVE-2025-5902?: High severity. CVSS v3 base score is 8.8 out of 10.