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    CVE-2026-19811

    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.

    Published:Aug 14, 2026
    Last Modified:Aug 18, 2026
    EPS:Aug 14, 2026
    EPSS Score:0.00466
    CVSS Score:8.8

    Affected Products

    Vendor
    Totolink
    Product
    A800r
    Vendor
    Totolink
    Product
    A800r Firmware

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-19847 (CVSS 7.4) — A security flaw has been discovered in TOTOLINK A800R 4.1.2cu.5137_B20200730. Affected is the function setWiFi…
    CVE-2026-19846 (CVSS 7.4) — A vulnerability was identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This impacts the function setUrlFilte…
    CVE-2026-19845 (CVSS 7.4) — A vulnerability was determined in TOTOLINK A800R 4.1.2cu.5137_B20200730. This affects the function setStaticDh…
    CVE-2026-19844 (CVSS 7.4) — A vulnerability was found in TOTOLINK A800R 4.1.2cu.5137_B20200730. The impacted element is the function setRa…
    CVE-2026-19815 (CVSS 7.4) — A flaw has been found in TOTOLINK A800R 4.1.2cu.5137_B20200730. Affected by this vulnerability is the function…
    CVE-2026-19814 (CVSS 7.4) — A vulnerability was detected in TOTOLINK A800R 4.1.2cu.5137_B20200730. Affected is the function setMacQos of t…
    CVE-2026-19813 (CVSS 7.4) — A security vulnerability has been detected in TOTOLINK A800R 4.1.2cu.5137_B20200730. This impacts the function…
    CVE-2026-19812 (CVSS 7.4) — A weakness has been identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This affects the function UploadCusto…
    CVE-2026-6157 (CVSS 7.4) — A vulnerability was detected in Totolink A800R 4.1.2cu.5137_B20200730. This impacts the function setAppEasyWiz…
    CVE-2025-4496 (CVSS 8.7) — A vulnerability was found in TOTOLINK T10, A3100R, A950RG, A800R, N600R, A3000RU and A810R 4.1.8cu.5241_B20210…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High