CVE-2026-19812: TOTOLINK A800R product.so cstecgi.cgi UploadCustomModule 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 2026-08-14
Weakness: CWE-119

Description

A weakness has been identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component product.so. This manipulation of the argument File causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

Affected products

TOTOLINK A800R: 4.1.2cu.5137_B20200730

References

https://github.com/panda666-888/vuls/blob/main/totolink/a800r/UploadCustomModule.md
https://vuldb.com/cve/CVE-2026-19812
https://vuldb.com/submit/869428
https://vuldb.com/vuln/389948
https://vuldb.com/vuln/389948/cti
https://www.totolink.net/

Get alerted when CVE-2026-19812 or the next vulnerability affects your stack