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Vulnerability record · CVE-2026-19814 · published 14 August 2026

CVE-2026-19814: Memory buffer overflow vulnerability

A vulnerability was detected in TOTOLINK A800R 4.1.2cu.5137_B20200730. Affected is the function setMacQos of the file /cgi-bin/cstecgi.cgi of the component firewall.so. Performing a manipulation of the argument macAddress results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is now public and may be used.

7.4 CVSS 4.0 High EPSS 0.85% · top 43.4% CWE-119 · Memory buffer overflowCWE-121 · Stack-based buffer overflow Deferred
7.4CVSS 4.0 base score, v2 9.0
0.85%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
14 Aug 2026Last modified by NVD

Description

A vulnerability was detected in TOTOLINK A800R 4.1.2cu.5137_B20200730. Affected is the function setMacQos of the file /cgi-bin/cstecgi.cgi of the component firewall.so. Performing a manipulation of the argument macAddress results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is now public and may be used.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/panda666-888/vuls/blob/main/totolink/a800r/setMacQos.md
https://vuldb.com/cve/CVE-2026-19814
https://vuldb.com/submit/869431
https://vuldb.com/vuln/389950
https://vuldb.com/vuln/389950/cti
https://www.totolink.net/

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Source: NIST National Vulnerability Database (record CVE-2026-19814), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.