CVE-2020-24231: Symmetric DS <3.12.0 uses mx4j to provide access to JMX over HTTP

Q: How do I fix CVE-2020-24231?

symmetricds: upgrade to 3.12.0. Exact commands for each OS are on this page.

Q: Is CVE-2020-24231 being exploited?

CVE-2020-24231 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-24231 affect?

CVE-2020-24231 affects symmetricds. Severity is critical (CVSS 9.8). Symmetric DS <3.12.0 uses mx4j to provide access to JMX over HTTP. mx4j, by default, has no auth and is available on all interfaces. An attacker can interact with JMX: get system info, and invoke MBean methods. It is possible to install add

Q: How urgent is CVE-2020-24231?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2020-24231 is a critical-severity flaw (CVSS 9.8) affecting symmetricds. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Symmetric DS <3.12.0 uses mx4j to provide access to JMX over HTTP. mx4j, by default, has no auth and is available on all interfaces. An attacker can interact with JMX: get system info, and invoke MBean methods. It is possible to install additional MBeans from a remote host using MLet that leads to arbitrary code execution.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Published	2020-10-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jumpmind

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-10-05 16:15 UTCPublished CVE record published
2026-06-17 03:05 UTCUpdated Record last modified

jumpmind symmetricds UPGRADE

Affected: < 3.12.0

Fixed in: 3.12.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy symmetricds || rpm -q symmetricds || symmetricds --version

2. UPGRADE to 3.12.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade symmetricds

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade symmetricds

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-24231?

symmetricds: upgrade to 3.12.0. Exact commands for each OS are on this page.

Is CVE-2020-24231 being exploited?

CVE-2020-24231 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-24231 affect?

CVE-2020-24231 affects symmetricds. Severity is critical (CVSS 9.8). Symmetric DS <3.12.0 uses mx4j to provide access to JMX over HTTP. mx4j, by default, has no auth and is available on all interfaces. An attacker can interact with JMX: get system info, and invoke MBean methods. It is possible to install add

How urgent is CVE-2020-24231?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

References

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