High severity · published May 4, 2026
CVE-2026-7748
Totolink N300RH POST Request cstecgi.cgi setUpgradeFW buffer overflow
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
A weakness has been identified in Totolink N300RH 3.2.4-B20220812. Affected by this issue is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. Executing a manipulation of the argument FileName can lead to buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N3
N300RH · Totolink
3.2.4-B20220812 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-7748
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-7748
lavender-bicycle-a5a.notion.site
https://lavender-bicycle-a5a.notion.site/TOTOLINK-N300RH-setUpgradeFW-34553a41781f80abb1d1c627d7ff4329?pvs=73
vuldb.com
https://vuldb.com/submit/807202
vuldb.com
https://vuldb.com/vuln/360923
vuldb.com
https://vuldb.com/vuln/360923/cti
www.totolink.net
https://www.totolink.net/
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