A vulnerability was found in TOTOLINK A800R 4.1.2cu.5137_B20200730. (CVE-2026-19844)
A stack-based buffer overflow vulnerability exists in the TOTOLINK A800R firmware version 4.1.2cu.5137_B20200730 in the setRadvdCfg function of the /cgi-bin/cstecgi.cgi component (ipv6.so). This vulnerability can be triggered remotely by manipulating the radvdinterfacename argument. Exploit code has been publicly disclosed, increasing the risk of exploitation. The vulnerability has a high severity score of 8.8 and impacts confidentiality, integrity, and availability.
AI Analysis
Technical Summary
CVE-2026-19844 is a stack-based buffer overflow vulnerability in the setRadvdCfg function of the /cgi-bin/cstecgi.cgi file within the ipv6.so component of TOTOLINK A800R firmware version 4.1.2cu.5137_B20200730. The vulnerability is triggered by remote manipulation of the radvdinterfacename argument, allowing potential remote code execution or denial of service. The vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer). Public exploit code is available, but no official patch or remediation information is provided in the source data.
Potential Impact
Successful exploitation of this vulnerability can lead to full compromise of the affected device, including unauthorized code execution, data corruption, or denial of service. The CVSS v3.1 score of 8.8 reflects high impact on confidentiality, integrity, and availability. The vulnerability is remotely exploitable without user interaction but requires low privileges (PR:L).
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or fix information is provided, users should monitor vendor communications for updates. Until a fix is available, restricting remote access to the affected device's management interface and disabling IPv6 features related to radvd configuration may reduce exposure.
A vulnerability was found in TOTOLINK A800R 4.1.2cu.5137_B20200730. (CVE-2026-19844)
Description
A stack-based buffer overflow vulnerability exists in the TOTOLINK A800R firmware version 4.1.2cu.5137_B20200730 in the setRadvdCfg function of the /cgi-bin/cstecgi.cgi component (ipv6.so). This vulnerability can be triggered remotely by manipulating the radvdinterfacename argument. Exploit code has been publicly disclosed, increasing the risk of exploitation. The vulnerability has a high severity score of 8.8 and impacts confidentiality, integrity, and availability.
CVSS v3.1
Score 8.8high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-19844 is a stack-based buffer overflow vulnerability in the setRadvdCfg function of the /cgi-bin/cstecgi.cgi file within the ipv6.so component of TOTOLINK A800R firmware version 4.1.2cu.5137_B20200730. The vulnerability is triggered by remote manipulation of the radvdinterfacename argument, allowing potential remote code execution or denial of service. The vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer). Public exploit code is available, but no official patch or remediation information is provided in the source data.
Potential Impact
Successful exploitation of this vulnerability can lead to full compromise of the affected device, including unauthorized code execution, data corruption, or denial of service. The CVSS v3.1 score of 8.8 reflects high impact on confidentiality, integrity, and availability. The vulnerability is remotely exploitable without user interaction but requires low privileges (PR:L).
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or fix information is provided, users should monitor vendor communications for updates. Until a fix is available, restricting remote access to the affected device's management interface and disabling IPv6 features related to radvd configuration may reduce exposure.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-5r5g-27gw-m59x
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-19844"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a7ff603bf8831d539880d6d
Added to database: 08/15/2026, 05:15:47 UTC
Last enriched: 08/15/2026, 05:27:19 UTC
Last updated: 08/15/2026, 14:41:00 UTC
Views: 7
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