CVE-2026-19844: TOTOLINK A800R ipv6.so cstecgi.cgi setRadvdCfg stack-based overflow

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-14 · updated 2026-08-18
Weakness: CWE-119

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.

Affected products

TOTOLINK A800R: 4.1.2cu.5137_B20200730

References

https://github.com/panda666-888/vuls/blob/main/totolink/a800r/setRadvdCfg.md
https://vuldb.com/cve/CVE-2026-19844
https://vuldb.com/submit/869443
https://vuldb.com/vuln/389980
https://vuldb.com/vuln/389980/cti
https://www.totolink.net/

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