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    CVE-2021-27791

    The function that is used to parse the Authentication header in Brocade Fabric OS Web application service before Brocade Fabric OS v9.0.1a and v8.2.3a fails to properly process a malformed authentication header from the client, resulting in reading memory addresses outside the intended range. An unauthenticated attacker could discover a request, which could bypass the authentication process.

    Published:Aug 12, 2021
    Last Modified:Nov 21, 2024
    EPS:Aug 12, 2021
    EPSS Score:0.00366
    CVSS Score:5.4

    Affected Products

    Vendor
    Broadcom
    Product
    Fabric Operating System

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2025-58381 (CVSS 4.6) — A vulnerability in Brocade Fabric OS before 9.2.1c2 could allow an authenticated attacker with admin privile…
    CVE-2025-9711 (CVSS 8.5) — A vulnerability in Brocade Fabric OS before 9.2.1c3 could allow elevating the privileges of the local authenti…
    CVE-2025-58380 (CVSS 4.6) — A vulnerability in Brocade Fabric OS before 9.2.1 could allow an authenticated attacker with admin privileges …
    CVE-2026-0383 (CVSS 8.2) — A vulnerability in Brocade Fabric OS could allow an authenticated, local attacker with privileges to access th…
    CVE-2025-58379 (CVSS 6) — Brocade Fabric OS before 9.2.1 has a vulnerability that could allow a local authenticated attacker to reveal c…
    CVE-2025-58383 (CVSS 8.4) — A vulnerability in Brocade Fabric OS versions before 9.2.1c2 could allow an administrator-level user to execut…
    CVE-2025-58382 (CVSS 8.5) — A vulnerability in the secure configuration of authentication and management services in Brocade Fabric OS be…
    CVE-2025-4663 (CVSS 6.8) — An Improper Check for Unusual or Exceptional Conditions vulnerability in Brocade Fabric OS before 9.2.2.a co…
    CVE-2025-4661 (CVSS 4.8) — A path transversal vulnerability in Brocade Fabric OS 9.1.0 through 9.2.2 could allow a local admin user to …
    CVE-2025-1976 (CVSS 8.6) — Brocade Fabric OS versions starting with 9.1.0 have root access removed, however, a local user with admin priv…

    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