Vulnerability · Published Oct 27, 2025 · Assigned by VulDB
CVE-2025-12239TOTOLINK A3300R cstecgi.cgi setDdnsCfg buffer overflow
High 8.8
In plain English
A high-severity buffer overflow in A3300R from TOTOLINK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 42.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-120, CWE-119 · 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
References
- VDB-329909 | TOTOLINK A3300R cstecgi.cgi setDdnsCfg buffer overflow vdb-entry, technical-description
- VDB-329909 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #673721 | TOTOLINK A3300R V17.0.0cu.557_B20221024 Buffer Overflow third-party-advisory
- https://github.com/noahze01/IoT-vulnerable/blob/main/TOTOLink/A3300R/setDdnsCfg.md exploit
- https://www.totolink.net/ product