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    CVE-2026-42021

    Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup static network configuration functionality of Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities. This vulnerability concerns the static_dns1 parameter.

    Published:Oct 20, 2026
    Last Modified:Oct 23, 2026
    EPS:Oct 20, 2026
    EPSS Score:0.00737
    CVSS Score:9.1

    Affected Products

    Vendor
    Totolink
    Product
    X2000r

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-121 Stack-based Buffer Overflow

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    CVE-2026-33568 (CVSS 9.1) — A OS command injection vulnerability exists in the boa formMapDelDevice macstr functionality of X2000R (versio…
    CVE-2026-41222 (CVSS 9.1) — A stack-based buffer overflow vulnerability exists in the boa formParentControl url functionality of X2000R (v…
    CVE-2026-40615 (CVSS 9.1) — A stack-based buffer overflow vulnerability exists in the boa formParentControl deviceName functionality of X2…
    CVE-2026-42020 (CVSS 9.1) — Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup pppoe functionality of Tot…
    CVE-2026-42019 (CVSS 9.1) — Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup pppoe functionality of Tot…
    CVE-2026-42024 (CVSS 9.1) — Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup static network configurati…

    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