CVE-2026-82539 (GCVE-0-2026-82539)

Vulnerability from cvelistv5 – Published: 2026-08-30 10:15 – Updated: 2026-08-30 10:15
VLAI
Title
TOTOLINK A720R MAC Filtering cstecgi.cgi setMacFilterRules memory corruption
Summary
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.
Severity
9.4 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
9.1 (Critical)
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
9.1 (Critical)
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
CWE
Assigner
References
URL Tags
https://vuldb.com/vuln/397055 vdb-entrytechnical-description
https://vuldb.com/vuln/397055/cti signaturepermissions-required
https://vuldb.com/cve/CVE-2026-82539 third-party-advisory
https://vuldb.com/submit/888696 third-party-advisory
https://github.com/Xernary/CVE-2026-82539 exploit
https://www.totolink.net/ product
Impacted products
Vendor Product Version CPE status
TOTOLINK A720R Affected: 4.1.5cu.630_B20250509
    cpe:2.3:o:totolink:a720r_firmware:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Nicola Giuffrida Xernary (VulDB User) Xernary (VulDB User)
Show details on NVD website
To clipboard 

{
  "containers": {
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        {
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            "cpe:2.3:o:totolink:a720r_firmware:*:*:*:*:*:*:*:*"
          ],
          "modules": [
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          ],
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          "vendor": "TOTOLINK",
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              "version": "4.1.5cu.630_B20250509"
            }
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        }
      ],
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          "tags": [
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          "tags": [
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      "title": "TOTOLINK A720R MAC Filtering cstecgi.cgi setMacFilterRules memory corruption",
      "x_generator": [
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  },
  "cveMetadata": {
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    "dateReserved": "2026-08-29T17:39:50.384Z",
    "dateUpdated": "2026-08-30T10:15:09.930Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.