Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| TOTOLINK | A720R | 4.1.5cu.630_B20250509 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
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Xernary/CVE-2026-82539 ★ 4 · Jul 12, 2026
Security advisory for TOTOLINK a720r buffer overflow vulnerability
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- VDB-397055 | TOTOLINK A720R MAC Filtering cstecgi.cgi setMacFilterRules memory corruption vdb-entry technical-description
- VDB-397055 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- CVE-2026-82539 | CVE Analysis and Report third-party-advisory
- Submit #888696 | TOTOLINK A720R V4.1.5cu.630_B20250509 Buffer Overflow third-party-advisory
- https://github.com/Xernary/CVE-2026-82539 exploit
- https://www.totolink.net/ product