CVE-2017-3207: The Java implementations of AMF3 deserializers in WebORB for Java by Midnight Coders, version 5.1.1.0, derive

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2017-3207 is a critical-severity flaw (CVSS 9.8) affecting weborb for java. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Java implementations of AMF3 deserializers in WebORB for Java by Midnight Coders, version 5.1.1.0, derive class instances from java.io.Externalizable rather than the AMF3 specification's recommendation of flash.utils.IExternalizable. A remote attacker with the ability to spoof or control an RMI server connection may be able to send serialized Java objects that execute arbitrary code when deserialized.

Why this priority

Critical severity
EPSS top 5%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	8.1% (top 5%)
CISA exploited list	No
Weakness	CWE-502
Published	2018-06-11
Last modified	2026-06-17

Publisher (CNA): CERT/CC · Vendor: themidnightcoders

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

Am I affected?

Timeline

2018-06-11 17:29 UTCPublished CVE record published
2026-06-17 01:17 UTCUpdated Record last modified

themidnightcoders weborb for java DOWNGRADE

Affected: 5.1.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.1.1.0

1. Check installed version

apt-cache policy weborb-for-java || rpm -q weborb-for-java || weborb-for-java --version

2. No fixed release: DOWNGRADE to a release before 5.1.1.0 (Debian / Ubuntu)

apt-cache madison weborb-for-java sudo apt install weborb-for-java=<VERSION_BEFORE_5.1.1.0> sudo apt-mark hold weborb-for-java

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list weborb-for-java sudo dnf downgrade weborb-for-java-<VERSION_BEFORE_5.1.1.0> sudo dnf versionlock add weborb-for-java

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2017-3207?

weborb for java: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-3207 being exploited?

CVE-2017-3207 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-2017-3207 affect?

CVE-2017-3207 affects weborb for java. Severity is critical (CVSS 9.8). The Java implementations of AMF3 deserializers in WebORB for Java by Midnight Coders, version 5.1.1.0, derive class instances from java.io.Externalizable rather than the AMF3 specification's recommendation of flash.utils.IExternalizable. A

How urgent is CVE-2017-3207?

Priority 68/100. Critical severity; EPSS top 5%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

Related CVEs

CVE-2017-3208 CRITICAL 9.8 DOWNGRADE The Java implementation of AMF3 deserializers used by WebORB for Java by Midnight Coders, version 5.1.1.0, all

References

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