High 8.8Published Oct 27, 2025

CVE-2025-12239TOTOLINK A3300R cstecgi.cgi setDdnsCfg buffer overflow

Updated under an hour ago (Oct 26, 2026, 6:30 AM ET)

Does this affect you?

It affects TOTOLINK A3300R and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for TOTOLINK A3300R

Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CNA)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
Weakness (CWE): CWE-120, CWE-119
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Analyzed
Record last updated: Oct 27, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

TOTOLINK A3300R totolink:a3300r (from the name)	17.0.0cu.557_B20221024	CNA record
totolink a3300r_firmware totolink:a3300r_firmware	17.0.0cu.557_b20221024	NVD

References

https://vuldb.com/?id.329909vdb-entry, technical-description, third-party-advisory
https://vuldb.com/?ctiid.329909signature, permissions-required, vdb-entry
https://vuldb.com/?submit.673721third-party-advisory, vdb-entry
https://github.com/noahze01/IoT-vulnerable/blob/main/TOTOLink/A3300R/setDdnsCfg.mdexploit, third-party-advisory
https://www.totolink.net/product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.