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Apache, ActiveMQ
Description
Apache ActiveMQ contains a deserialization of untrusted data vulnerability that may allow a remote attacker with network access to a broker to run shell commands by manipulating serialized class types in the OpenWire protocol to cause the broker to instantiate any class on the classpath.
CVSS severity
Critical (9.8/10)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Sourced from NVD, reflects how severe this vulnerability is if exploited, not whether it has been. Every advisory on this page is already a CISA-confirmed active exploitation case regardless of its CVSS score.
EPSS, exploit probability
Critical99.9%
estimated chance of real-world exploitation in the next 30 days, higher than 100.0% of every CVE FIRST.org scores
Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.
Public exploit references (via NVD)
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA-recommended due date: 2023-11-23
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