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    CVE-2025-62820

    Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.

    Published:Oct 23, 2025
    Last Modified:Apr 15, 2026
    EPS:Oct 23, 2025
    EPSS Score:0.00044
    CVSS Score:4.9

    Affected Products

    Vendor
    Slack
    Product
    Nebula

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-420 Unprotected Alternate Channel

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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