Critical severity · published Oct 27, 2025
CVE-2025-12239
TOTOLINK A3300R cstecgi.cgi setDdnsCfg buffer overflow
9.8
CVSS
0.8%
EPSS
No
On KEV
Description
A weakness has been identified in TOTOLINK A3300R 17.0.0cu.557_B20221024. The impacted element is the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi. Executing manipulation can lead to buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be exploited.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
A3
A3300R · TOTOLINK
17.0.0cu.557_B20221024 · source: vendor
AF
A3300r Firmware · Totolink
17.0.0cu.557_b20221024 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-12239
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-12239
Exploit
https://github.com/noahze01/IoT-vulnerable/blob/main/TOTOLink/A3300R/setDdnsCfg.md
Permissions Required
https://vuldb.com/?ctiid.329909
Third Party Advisory
https://vuldb.com/?id.329909
Third Party Advisory
https://vuldb.com/?submit.673721
Product
https://www.totolink.net/
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