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    CVE-2026-21907

    A Use of a Broken or Risky Cryptographic Algorithm vulnerability in the TLS/SSL server of Juniper Networks Junos Space allows the use of static key ciphers (ssl-static-key-ciphers), reducing the confidentiality of on-path traffic communicated across the connection. These ciphers also do not support Perfect Forward Secrecy (PFS), affecting the long-term confidentiality of encrypted communications.This issue affects all versions of Junos Space before 24.1R5.

    Published:Jan 15, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 15, 2026
    EPSS Score:0.0001
    CVSS Score:5.9

    Affected Products

    Vendor
    Juniper
    Product
    Junos Space
    Vendor
    Juniper Networks
    Product
    Junos Os

    Exploits

    No exploit reference

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    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