CVE-2026-19811

HIGH 8.8

TOTOLINK A800R firewall.so cstecgi.cgi setIpQosRules stack-based overflow

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

A security flaw has been discovered in TOTOLINK A800R 4.1.2cu.5137_B20200730. The impacted element is the function setIpQosRules of the file /cgi-bin/cstecgi.cgi of the component firewall.so. The manipulation of the argument Comment results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

CWE	CWE-121 CWE-119
Vendor	totolink
Product	a800r
Published	Aug 14, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

TOTOLINK / A800R

4.1.2cu.5137_B20200730

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/389947 vuldb.com: https://vuldb.com/vuln/389947/cti vuldb.com: https://vuldb.com/cve/CVE-2026-19811 vuldb.com: https://vuldb.com/submit/869425 github.com: https://github.com/panda666-888/vuls/blob/main/totolink/a800r/setIpQosRules.md totolink.net: https://www.totolink.net/

Credits

🔍 panda_0x1 (VulDB User)