CVE-2026-19844: Stack-based Buffer Overflow in TOTOLINK A800R
A vulnerability was found in TOTOLINK A800R 4.1.2cu.5137_B20200730. The impacted element is the function setRadvdCfg of the file /cgi-bin/cstecgi.cgi of the component ipv6.so. Performing a manipulation of the argument radvdinterfacename results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made public and could be used.
AI Analysis
Technical Summary
This vulnerability affects TOTOLINK A800R firmware version 4.1.2cu.5137_B20200730. It arises from improper handling of the radvdinterfacename argument in the setRadvdCfg function of the /cgi-bin/cstecgi.cgi script, part of the ipv6.so component. The flaw is a stack-based buffer overflow that can be triggered remotely without user interaction or privileges beyond low-level access. Public exploit code exists, increasing the risk of exploitation. The CVSS v4.0 score is 8.7, indicating a high impact on confidentiality, integrity, and availability. No vendor advisory or patch information is currently provided, and the vulnerability is not related to a cloud service.
Potential Impact
Successful exploitation can lead to a stack-based buffer overflow, which may allow an attacker to execute arbitrary code remotely, potentially compromising the device's confidentiality, integrity, and availability. The vulnerability can be triggered remotely with low attack complexity and no user interaction, making it a significant risk for affected devices.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the device's management interfaces from untrusted networks to reduce exposure. Monitor for any updates from TOTOLINK regarding patches or mitigations.
CVE-2026-19844: Stack-based Buffer Overflow in TOTOLINK A800R
Description
A vulnerability was found in TOTOLINK A800R 4.1.2cu.5137_B20200730. The impacted element is the function setRadvdCfg of the file /cgi-bin/cstecgi.cgi of the component ipv6.so. Performing a manipulation of the argument radvdinterfacename results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been made public and could be used.
CVSS v4.0
Score 8.7high
Affected software
TOTOLINK
A800R
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects TOTOLINK A800R firmware version 4.1.2cu.5137_B20200730. It arises from improper handling of the radvdinterfacename argument in the setRadvdCfg function of the /cgi-bin/cstecgi.cgi script, part of the ipv6.so component. The flaw is a stack-based buffer overflow that can be triggered remotely without user interaction or privileges beyond low-level access. Public exploit code exists, increasing the risk of exploitation. The CVSS v4.0 score is 8.7, indicating a high impact on confidentiality, integrity, and availability. No vendor advisory or patch information is currently provided, and the vulnerability is not related to a cloud service.
Potential Impact
Successful exploitation can lead to a stack-based buffer overflow, which may allow an attacker to execute arbitrary code remotely, potentially compromising the device's confidentiality, integrity, and availability. The vulnerability can be triggered remotely with low attack complexity and no user interaction, making it a significant risk for affected devices.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the device's management interfaces from untrusted networks to reduce exposure. Monitor for any updates from TOTOLINK regarding patches or mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-08-14T08:04:29.279Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a7f4ccfbf8831d53972217f
Added to database: 08/14/2026, 17:13:51 UTC
Last enriched: 08/22/2026, 13:03:22 UTC
Last updated: 09/27/2026, 01:47:40 UTC
Views: 40
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