Buffer overflow in Totolink A720r
CVE-2025-9303
A security flaw has been discovered in TOTOLINK A720R 4.1.5cu.630_B20250509. This issue affects the function setParentalRules of the file /cgi-bin/cstecgi.cgi. Performing manipulation of the argument desc results in buffer overflow. The attack is possible to be carried out remotely. The exploit has been released to the public and may be exploited.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.009 (56.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.000
Affected products
- Totolink A720r — versions 4.1.5cu.630_B20250509
- Totolink A720r Firmware — versions 4.1.5cu.630_b20250509
Weakness classification (CWE)
Public proof-of-concept exploits
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/lin-3-start/lin-cve/blob/main/TOTOLINK A720R/TOTOLINK-A720R.md (related, Exploit, Third Party Advisory)
- github.com/lin-3-start/lin-cve/blob/main/TOTOLINK A720R/TOTOLINK-A720R.md (Exploit, Third Party Advisory, exploit)
- www.totolink.net/ (product, VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-9303?
- CVE-2025-9303 is a high-severity vulnerability in Totolink A720r, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2025-08-21.
- How severe is CVE-2025-9303?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2025-9303 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.