CVE-2017-3206: The Java implementation of AMF3 deserializers used by Flamingo amf-serializer by Exadel, version 2.2.0, allows

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2017-3206 is a critical-severity flaw (CVSS 9.8) affecting flamingo. 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 by Flamingo amf-serializer by Exadel, version 2.2.0, allows external entity references (XXEs) from XML documents embedded within AMF3 messages. If the XML parsing is handled incorrectly it could potentially expose sensitive data on the server, denial of service, or server side request forgery.

Why this priority

Critical severity
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	3.6% (top 10%)
CISA exploited list	No
Weakness	CWE-611
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 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 || rpm -q flamingo || flamingo --version

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

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

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

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

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-2017-3206?

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

Is CVE-2017-3206 being exploited?

CVE-2017-3206 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-2017-3206 affect?

CVE-2017-3206 affects flamingo. Severity is critical (CVSS 9.8). The Java implementation of AMF3 deserializers used by Flamingo amf-serializer by Exadel, version 2.2.0, allows external entity references (XXEs) from XML documents embedded within AMF3 messages. If the XML parsing is handled incorrectly it

How urgent is CVE-2017-3206?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

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References

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