CVE-2017-3206

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 4%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
88.5%
KEV
Not listed

Published

June 11, 2018

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated May 28, 2026
🔬 Proof of concept available. No patch confirmed yet. Sources: cert.
cert

VU#307983 - Action Message Format (AMF3) Java implementations are vulnerable to insecure deserialization and XML external entities references

https://www.kb.cert.org/vuls/id/307983
generic🟡 PoC Available

CODE WHITE | Blog: AMF – Another Malicious Format

https://codewhitesec.blogspot.com/2017/04/amf.html
generic

Flaws in Java AMF Libraries Allow Remote Code Execution - SecurityWeek

http://www.securityweek.com/flaws-java-amf-libraries-allow-remote-code-execution
generic
http://www.securityfocus.com/bid/97380

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 01:29 UTCEG score recompute
  2. 2026-07-22 22:08 UTCEG score recompute
  3. 2026-07-22 14:04 UTCEPSS rescore
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  54. 2026-05-28 07:01 UTCEG score recompute
  55. 2026-05-28 07:01 UTCGHSA enrichment
  56. 2026-05-27 13:38 UTCEPSS rescore
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  60. 2026-05-26 07:17 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2017-3206?
CVE-2017-3206 is a critical vulnerability published on June 11, 2018. 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,…
When was CVE-2017-3206 disclosed?
CVE-2017-3206 was first published in the National Vulnerability Database on June 11, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-3206 actively exploited?
CVE-2017-3206 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 88.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-3206?
CVE-2017-3206 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-3206?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-3206, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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