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    CVE-2021-42084

    An issue was discovered in Zammad before 4.1.1. An attacker with valid agent credentials may send a series of crafted requests that cause an endless loop and thus cause denial of service.

    Published:Oct 7, 2021
    Last Modified:Nov 21, 2024
    EPS:Oct 7, 2021
    EPSS Score:0.00427
    CVSS Score:6.5

    Affected Products

    Vendor
    Zammad
    Product
    Zammad

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-13229 (CVSS 7.1) — Zammad 7.1.0 contains an authenticated improper authorization vulnerability in the ticket article attachment c…
    CVE-2026-34837 (CVSS 5.3) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1, he REST endpoint POST /api…
    CVE-2026-34782 (CVSS 5.3) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the REST endpoin…
    CVE-2026-34724 (CVSS 8.7) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1, a server-side template inj…
    CVE-2026-34723 (CVSS 8.7) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, unauthenticated …
    CVE-2026-34722 (CVSS 6.9) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the used endpoin…
    CVE-2026-34721 (CVSS 5.9) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the OAuth callba…
    CVE-2026-34720 (CVSS 2.3) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the SSO mechanis…
    CVE-2026-34719 (CVSS 8.3) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the webhook mode…
    CVE-2026-34718 (CVSS 5.3) — Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the HTML sanitiz…

    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