Zabbix Auth User Can Trigger CPU DoS via imgstore.php
CVE-2025-49643 Published on December 1, 2025
Frontend DoS vulnerability due to asymmetric resource consumption
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.
Weakness Type
What is an Amplification Vulnerability?
Software that does not appropriately monitor or control resource consumption can lead to adverse system performance. This situation is amplified if the software allows malicious users or attackers to consume more resources than their access level permits. Exploiting such a weakness can lead to asymmetric resource consumption, aiding in amplification attacks against the system or the network.
CVE-2025-49643 has been classified to as an Amplification vulnerability or weakness.
Products Associated with CVE-2025-49643
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Affected Versions
Zabbix:- Version 6.0.0, <= 6.0.41 is affected.
- Version 7.0.0, <= 7.0.18 is affected.
- Version 7.2.0, <= 7.2.12 is affected.
- Version 7.4.0, <= 7.4.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.