UBUNTU-CVE-2023-35838

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    UBUNTU-CVE-2023-35838

    Published: 9 Aug 2023Last Modified: 20 Jan 2026
    Upstream:
    CVE-2023-35838

    Summary:

    Details: The WireGuard client 0.5.3 on Windows insecurely configures the operating system and firewall such that traffic to a local network that uses non-RFC1918 IP addresses is blocked. This allows an adversary to trick the victim into blocking IP traffic to selected IP addresses and services even while the VPN is enabled. NOTE: the tunnelcrack.mathyvanhoef.com website uses this CVE ID to refer more generally to "LocalNet attack resulting in the blocking of traffic" rather than to only WireGuard.

    References: https://ubuntu.com/security/CVE-2023-35838, https://tunnelcrack.mathyvanhoef.com/details.html, https://papers.mathyvanhoef.com/usenix2023-tunnelcrack.pdf, https://openvpn.net/security-advisory/statement-regarding-tunnelcrack-vulnerabilities/, https://www.softether.org/9-about/News/905-TunnelCrack, https://www.cve.org/CVERecord?id=CVE-2023-35838, https://security.paloaltonetworks.com/PAN-SA-2023-0004

    Affected packages

    Package

    Name: wireguard

    Purl: pkg:deb/ubuntu/[email protected]~16.04.2?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.0.20200513-1~16.04.1
    1.0.20200513-1~16.04.2

    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
    UBUNTU-CVE-2023-35838 | CVE-DB