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Vulnerability record · CVE-2025-4496 · published 10 May 2025

CVE-2025-4496: Totolink a3000ru firmware memory buffer overflow vulnerability

TTotolink · A3000ru Firmware

A vulnerability was found in TOTOLINK T10, A3100R, A950RG, A800R, N600R, A3000RU and A810R 4.1.8cu.5241_B20210927. It has been declared as critical. This vulnerability affects the function CloudACMunualUpdate of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument FileName leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

8.7 CVSS 4.0 High EPSS 1.2% · top 34.2% CWE-119 · Memory buffer overflowCWE-120 · Classic buffer overflow
8.7CVSS 4.0 base score, v2 9.0
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

A vulnerability was found in TOTOLINK T10, A3100R, A950RG, A800R, N600R, A3000RU and A810R 4.1.8cu.5241_B20210927. It has been declared as critical. This vulnerability affects the function CloudACMunualUpdate of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument FileName 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:X/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

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

References

LinkTags
https://github.com/CH13hh/tmp_store_cc/blob/main/tt/ta/1.md Broken Link
https://vuldb.com/?ctiid.308212 Permissions RequiredVDB Entry
https://vuldb.com/?id.308212 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.567081 Third Party AdvisoryVDB Entry
https://www.totolink.net/ Product
https://github.com/CH13hh/tmp_store_cc/blob/main/tt/ta/1.md Broken Link

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Related vulnerabilities

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

9.8CVE-2025-67186Totolink a950rg firmware classic buffer overflow vulnerabilityTOTOLINK A950RG V4.1.2cu.5204_B20210112 contains a buffer overflow vulnerability in the setUrlFilterRules interface of /lib/cste_modules/firewall.so.…EPSS 0.74%9.8CVE-2025-67187Totolink a950rg firmware stack-based buffer overflow vulnerabilityA stack-based buffer overflow vulnerability was identified in TOTOLINK A950RG V4.1.2cu.5204_B20210112. The flaw exists in the setIpQosRules interface…EPSS 0.47%9.8CVE-2025-67188Totolink a950rg firmware classic buffer overflow vulnerabilityA buffer overflow vulnerability exists in TOTOLINK A950RG V4.1.2cu.5204_B20210112. The issue resides in the setRadvdCfg interface of the /lib/cste_mo…EPSS 0.65%9.8CVE-2025-44655Totolink a7100ru firmware vulnerabilityIn TOTOLink A7100RU V7.4, A950RG V5.9, and T10 V5.9, the chroot_local_user option is enabled in the vsftpd.conf. This could lead to unauthorized acce…EPSS 0.34%9.8CVE-2025-45788Totolink a3100r firmware out-of-bounds write vulnerabilityTOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow via the comment parameter in setMacFilterRules.EPSS 0.79%9.8CVE-2025-45789Totolink a3100r firmware out-of-bounds write vulnerabilityTOTOLINK A3100R V5.9c.1527 is vulnerable to buffer overflow via the urlKeyword parameter in setParentalRules.EPSS 0.79%9.8CVE-2025-45790Totolink a3100r firmware out-of-bounds write vulnerabilityTOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow via the priority parameter in the setMacQos interface of /lib/cste_modules/firewall.so.EPSS 0.79%9.8CVE-2025-45797Totolink a950rg firmware out-of-bounds write vulnerabilityTOTOlink A950RG V4.1.2cu.5204_B20210112 contains a buffer overflow vulnerability. The vulnerability arises from the improper input validation of the …EPSS 17%

Source: NIST National Vulnerability Database (record CVE-2025-4496), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.