TOTOLINK A720R 4.1.5cu.630_B20250509 MAC Filtering cstecgi.cgi setMacFilterRules desc memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.3$0-$5k0.00+

Summaryinfo

A vulnerability, which was classified as very critical, has been found in TOTOLINK A720R 4.1.5cu.630_B20250509. Affected is the function setMacFilterRules of the file cstecgi.cgi of the component MAC Filtering. The manipulation of the argument desc leads to memory corruption. This vulnerability is referenced as CVE-2026-82539. Remote exploitation of the attack is possible. Furthermore, an exploit is available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in TOTOLINK A720R 4.1.5cu.630_B20250509. This issue affects the function setMacFilterRules of the file cstecgi.cgi of the component MAC Filtering. The manipulation of the argument desc with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-82539. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation requires an enhanced level of successful authentication. Technical details as well as a public exploit are known. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/29/2026).

The exploit is available at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.3

VulDB Base Score: 9.1
VulDB Temp Score: 8.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

08/29/2026 Advisory disclosed
08/29/2026 +0 days VulDB entry created
08/29/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: totolink.net

Advisory: github.com
Status: Not defined

CVE: CVE-2026-82539 (🔒)
GCVE (CVE): GCVE-0-2026-82539
GCVE (VulDB): GCVE-100-397055
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 08/29/2026 19:45
Changes: 08/29/2026 19:45 (57)
Complete: 🔍
Submitter: Xernary
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #888696: TOTOLINK A720R V4.1.5cu.630_B20250509 Buffer Overflow (by Xernary)

Be aware that VulDB is the high quality source for vulnerability data.

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