Frontend DoS vulnerability due to asymmetric resource consumption (CVE-2025-49643)

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    • Type: Defect (Security)
    • Resolution: Fixed
    • Priority: Minor
    • None
    • Affects Version/s: None
    • Component/s: Frontend (F)
    • None

      CVE ID CVE-2025-49643
      CVSS score 6.0 (Medium)
      CVSS vector CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
      Affected components Frontend
      Summary Frontend DoS vulnerability due to asymmetric resource consumption
      Description An authenticated Zabbix user (including Guest) is able to cause disproportionate CPU load on the webserver by sending specially crafted parameters to /imgstore.php, leading to potential denial of service.
      Known attack vectors An authenticated user sending crafted HTTP requests to Zabbix Frontend.
      Affected and fix version/s Affected: 6.0.0 - 6.0.41 → Fixed: 6.0.42
      Affected: 7.0.0 - 7.0.18 → Fixed: 7.0.19
      Affected: 7.2.0 - 7.2.12 → Fixed: 7.2.13
      Affected: 7.4.0 - 7.4.2 → Fixed: 7.4.3
      Mitigation Update the affected components to their respective fixed versions.
      Workarounds -
      Acknowledgements Zabbix wants to thank Pamparau Sebastian (sebiee) for submitting this report on the HackerOne bug bounty platform.

            Assignee:
            Zabbix Support Team
            Reporter:
            Janis Nulle
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              Created:
              Updated:
              Resolved: