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    CVE-2023-6549

    Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of Service and Out-Of-Bounds Memory Read

    Published:Jan 17, 2024
    Last Modified:Feb 26, 2026
    EPS:Jan 17, 2024
    EPSS Score:0.78605
    CVSS Score:8.2

    CISA Notification

    Description

    Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of Service and Out-Of-Bounds Memory Read

    Required Action:

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

    Notes:

    No extra notes provided.

    Due Date
    Feb 7, 2024
    947 days ago
    Alert Date
    Jan 17, 2024
    968 days ago

    Affected Products

    Vendor
    Citrix
    Product
    Netscaler Application Delivery Controller
    Vendor
    Citrix
    Product
    Netscaler Gateway

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-3055 (CVSS 9.3) — Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to …
    CVE-2025-7776 (CVSS 8.8) — Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service in NetScale…
    CVE-2025-7775 (CVSS 9.2) — Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service in NetScaler ADC and N…
    CVE-2025-6543 (CVSS 9.2) — Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and Ne…
    CVE-2025-5349 (CVSS 8.7) — Improper access control on the NetScaler Management Interface in NetScaler ADC and NetScaler Gateway…
    CVE-2025-5777 (CVSS 9.3) — Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN vi…
    CVE-2024-8535 (CVSS 5.8) — Authenticated user can access unintended user capabilities in NetScaler ADC and NetScaler Gateway if the appli…
    CVE-2024-8534 (CVSS 8.4) — Memory safety vulnerability leading to memory corruption and Denial of Service in NetScaler ADC and Gateway if…

    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