What is CVE-2018-4939?

CVE-2018-4939 is a critical-severity vulnerability in Adobe Coldfusion, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2018-05-19.

How severe is CVE-2018-4939?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2018-4939 known to be exploited?

Yes. CVE-2018-4939 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 16 public proof-of-concept repositories are indexed.

Deserialization in Adobe Coldfusion

CVE-2018-4939

Adobe ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions have an exploitable Deserialization of Untrusted Data vulnerability. Successful exploitation could lead to arbitrary code execution.

Vulnerability class: Insecure Deserialization

Published 2018-05-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.620 (99.2th percentile), scored 2026-10-20.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.621 · newest: 0.620 · change: -0.001

Affected products

Adobe Coldfusion — versions 11.0, 2016
Adobe Coldfusion Update 5 And Earlier Versions, 11 13 Versions — versions Adobe ColdFusion ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

helpx.adobe.com/security/products/coldfusion/apsb18-14.html (Vendor Advisory)
www.securityfocus.com/bid/103718 (VDB Entry, Third Party Advisory, vdb-entry)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Third Party Advisory, US Government Resource)

Frequently asked questions

What is CVE-2018-4939?: CVE-2018-4939 is a critical-severity vulnerability in Adobe Coldfusion, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2018-05-19.
How severe is CVE-2018-4939?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-4939 known to be exploited?: Yes. CVE-2018-4939 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 16 public proof-of-concept repositories are indexed.