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Vulnerability record · CVE-2025-5901 · published 9 June 2025

CVE-2025-5901: Totolink t10 firmware memory buffer overflow vulnerability

TTotolink · T10 Firmware

A vulnerability has been found in TOTOLINK T10 4.1.8cu.5207 and classified as critical. This vulnerability affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. The manipulation of the argument File leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

7.4 CVSS 4.0 High EPSS 6.2% · top 6.7% CWE-119 · Memory buffer overflowCWE-120 · Classic buffer overflow
7.4CVSS 4.0 base score, v2 9.0
6.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A vulnerability has been found in TOTOLINK T10 4.1.8cu.5207 and classified as critical. This vulnerability affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. The manipulation of the argument File leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public 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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://candle-throne-f75.notion.site/TOTOLINK-T10-UploadCustomModule-20bdf0aa118580d59961cd545582c118 ExploitThird Party Advisory
https://vuldb.com/?ctiid.311674 Permissions RequiredVDB Entry
https://vuldb.com/?id.311674 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.592243 Third Party AdvisoryVDB Entry
https://www.totolink.net/ Product
https://candle-throne-f75.notion.site/TOTOLINK-T10-UploadCustomModule-20bdf0aa118580d59961cd545582c118 ExploitThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-5901), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.