Critical 9.1Published Aug 30, 2026

CVE-2026-82539TOTOLINK A720R MAC Filtering cstecgi.cgi setMacFilterRules memory corruption

Updated under an hour ago (2026-10-19 10:00 UTC)

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It affects TOTOLINK A720R. Add what you run to find out whether that includes you.

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Every CVE for TOTOLINK A720R

Exploited in the last 30 days

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.

CVSS: 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
Weakness (CWE): 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: Deferred
Record last updated: Sep 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

TOTOLINK A720R totolink:a720r_firmware	4.1.5cu.630_B20250509	CNA record

References

https://vuldb.com/vuln/397055vdb-entry, technical-description
https://vuldb.com/vuln/397055/ctisignature, permissions-required
https://vuldb.com/cve/CVE-2026-82539third-party-advisory
https://vuldb.com/submit/888696third-party-advisory
https://github.com/Xernary/CVE-2026-82539exploit
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.