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8.5
CVE-2026-82539: TOTOLINK A720R router can be remotely crashed via MAC filter
CVE-2026-82539 · published 4 days ago
Summary
The A720R router’s MAC‑filtering feature can be tricked by sending a specially crafted request, causing the device’s memory to become corrupted. This can make the router stop working or become unstable, and it can be done from outside the network. Update the router firmware or disable the MAC‑filtering function until a fix is applied.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| totolink | a720r | 4.1.5cu.630_B20250509 |
Original advisory text
A vulnerability was determined in TOTOLINK A720R 4.1.5cu.630_B20250509. This impacts the function setMacFilterRules of the file cstecgi.cgi of the component MAC Filtering. Executing a manipulation ...
A vulnerability was determined in TOTOLINK A720R 4.1.5cu.630_B20250509. This impacts the function setMacFilterRules of the file cstecgi.cgi of the component MAC Filtering. Executing a manipulation of the argument desc can lead to memory corruption. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.
References
- https://github.com/Xernary/CVE-2026-82539 exploit
- https://vuldb.com/vuln/397055 vdb-entry technical-description
- https://vuldb.com/vuln/397055/cti signature permissions-required
- https://vuldb.com/cve/CVE-2026-82539 third-party-advisory
- https://vuldb.com/submit/888696 third-party-advisory
- https://www.totolink.net/ product
Severity
8.5
High
CVSS 3.1: 9.1 (MITRE)
Exploitation
EPSS <1%
Type
CWE-119Buffer Overflow
Timeline
Published30 Aug 2026
Updated1 Sep 2026
First seen30 Aug 2026
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