Buffer overflow in Totolink A3000ru
CVE-2025-4496
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.c…
Vulnerability class: Buffer Overflow
EPSS: 0.006 (71.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Totolink A3000ru — versions 4.1.8cu.5241_B20210927
- Totolink A3100r — versions 4.1.8cu.5241_B20210927
- Totolink A800r — versions 4.1.8cu.5241_B20210927
- Totolink A810r — versions 4.1.8cu.5241_B20210927
- Totolink A950rg — versions 4.1.8cu.5241_B20210927
- Totolink N600r — versions 4.1.8cu.5241_B20210927
- Totolink T10 — versions 4.1.8cu.5241_B20210927
Weakness classification (CWE)
References
- VDB-308212 | TOTOLINK T10/A3100R/A950RG/A800R/N600R/A3000RU/A810R cstecgi.cgi CloudACMunualUpdate buffer overflow (vdb-entry, technical-description)
- VDB-308212 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #567081 | TOTOLINK T10/A3100R/A950RG/A800R/N600R/A3000RU/A810R V4.1.8cu.5241_B20210927 Buffer Overflow (third-party-advisory)
- github.com/CH13hh/tmp_store_cc/blob/main/tt/ta/1.md (exploit)
- www.totolink.net/ (product)
Frequently asked questions
- What is CVE-2025-4496?
- CVE-2025-4496 is a high-severity vulnerability in Totolink A3000ru, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-05-10.
- How severe is CVE-2025-4496?
- High severity. CVSS v3 base score is 8.8 out of 10.