CVE-2023-46604: Apache ActiveMQ Deserialization of Untrusted Data Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 6 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 100%
EPSS score, percentile 100 of all scored records
- How severe?
- 10.0 Critical
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA deadline . Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Which versions are affected?
Affected
- from 5.18.0 to before 5.18.3
- from 5.17.0 to before 5.17.6
- from 5.16.0 to before 5.16.7
- before 5.15.16
- from 5.18.0 to before 5.18.3
- from 5.17.0 to before 5.17.6
and 2 more in the table below
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
What to do
Required action, set by CISA
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date for this action: .
Advisories and patches
Linked from CISA's catalog entry
- https://activemq.apache.org/security-advisories.data/CVE-2023-46604-announcement.txt
- https://nvd.nist.gov/vuln/detail/CVE-2023-46604
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from 5.18.0 to before 5.18.3 |
| Affected | from 5.17.0 to before 5.17.6 |
| Affected | from 5.16.0 to before 5.16.7 |
| Affected | before 5.15.16 |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | from 5.18.0 to before 5.18.3 |
| Affected | from 5.17.0 to before 5.17.6 |
| Affected | from 5.16.0 to before 5.16.7 |
| Affected | from 5.8.0 to before 5.15.16 |
Versions not listed are: unaffected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
About this vulnerability
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.
Summary: CISA's KEV catalog, as of .
- CISA added CVE-2023-46604 to its Known Exploited Vulnerabilities (KEV) catalog on 2 Nov 2023.
- CISA marks it as known to be used in ransomware campaigns.
- The due date CISA sets for the required action is 23 Nov 2023.
- The CVE record was published on 27 Oct 2023, 6 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 10.0 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 100% (percentile 100), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.
Description
Apache ActiveMQ, Apache ActiveMQ Legacy OpenWire Module: Unbounded deserialization causes ActiveMQ to be vulnerable to a remote code execution (RCE) attack
The Java OpenWire protocol marshaller is vulnerable to Remote Code Execution. This vulnerability may allow a remote attacker with network access to either a Java-based OpenWire broker or client to run arbitrary shell commands by manipulating serialized class types in the OpenWire protocol to cause either the client or the broker (respectively) to instantiate any class on the classpath. Users are recommended to upgrade both brokers and clients to version 5.15.16, 5.16.7, 5.17.6, or 5.18.3 which fixes this issue.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
Weakness
- CWE-502: Deserialization of Untrusted Data
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| Added to CISA KEV | |
| CISA due date for the required action | |
| CVE record last updated |
References
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