Exploited vulnerability · CISA KEV

Is CVE-2023-46604 exploited? Yes: in CISA KEV since 2 Nov 2023

Gociux · Apache ActiveMQ · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2023-46604, Apache ActiveMQ Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 2 Nov 2023, 6 days after it was published. It is known to be used in ransomware campaigns. It affects Apache ActiveMQ. If you run it, CISA's required action is: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What it is

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.

What to do

1. Check whether you run it. Look for ActiveMQ in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apache CVE at once.
2. Apply the fix. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 27 Oct 2023.
4. Get told next time. Email alerts when CISA adds a CVE for Apache.

Other exploited CVEs in ActiveMQ

• CVE-2026-34197: Apache ActiveMQ Improper Input Validation Vulnerability (16 Apr 2026)
• CVE-2016-3088: Apache ActiveMQ Improper Input Validation Vulnerability (10 Feb 2022)

References

• activemq.apache.org/security-advisories.data/CVE-2023-46604-announcement.txt
• nvd.nist.gov/vuln/detail/CVE-2023-46604

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2023 · Apache scorecard · act-now radar.