CVE-2017-3201: The Java implementation of AMF3 deserializers used in Flamingo amf-serializer by Exadel, version 2.2.0 derives

This week

HIGH 8.1REMOTEDOWNGRADE

CVE-2017-3201 is a high-severity flaw (CVSS 8.1) affecting flamingo amf-serializer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Java implementation of AMF3 deserializers used in Flamingo amf-serializer by Exadel, version 2.2.0 derives 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

High severity
EPSS top 8%: 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	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	5.2% (top 8%)
CISA exploited list	No
Weakness	CWE-502
Published	2018-06-11
Last modified	2026-06-17

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

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

exadel flamingo amf-serializer DOWNGRADE

Affected: 2.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.0

1. Check installed version

apt-cache policy flamingo-amf-serializer || rpm -q flamingo-amf-serializer || flamingo-amf-serializer --version

2. No fixed release: DOWNGRADE to a release before 2.2.0 (Debian / Ubuntu)

apt-cache madison flamingo-amf-serializer sudo apt install flamingo-amf-serializer=<VERSION_BEFORE_2.2.0> sudo apt-mark hold flamingo-amf-serializer

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

dnf --showduplicates list flamingo-amf-serializer sudo dnf downgrade flamingo-amf-serializer-<VERSION_BEFORE_2.2.0> sudo dnf versionlock add flamingo-amf-serializer

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-2017-3201?

flamingo amf-serializer: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-3201 being exploited?

CVE-2017-3201 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-2017-3201 affect?

CVE-2017-3201 affects flamingo amf-serializer. Severity is high (CVSS 8.1). The Java implementation of AMF3 deserializers used in Flamingo amf-serializer by Exadel, version 2.2.0 derives class instances from java.io.Externalizable rather than the AMF3 specification's recommendation of flash.utils.IExternalizable. A

How urgent is CVE-2017-3201?

Priority 61/100. High severity; EPSS top 8%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

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