CVE-2018-4939
CriticalExploitedPublic exploitAdobe ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions have an exploitable Deserialization of Untrusted Data vulnerability.
Published Mar 23, 2021 · Updated Oct 21, 2025
Key Facts
Patch immediately- CVE-2018-4939 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Coldfusion (Adobe), Adobe ColdFusion ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 20, 2020. Public exploit code is available.
- EPSS estimates a 62% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
62%
Higher than 99.1% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | May 3, 2022 | Not reported |
| Industry KEV feed | Oct 20, 2020 | May 3, 2022 | Not reported |
| CIRCL KEV | Nov 3, 2021 | May 3, 2022 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
21 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ColdfusionAdobe | 11.0, 11.0-update1, 11.0-update10, 11.0-update11, 11.0-update12, 11.0-update13, 11.0-update2, 11.0-update3 | n/a |
| Adobe ColdFusion ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions | >= Adobe ColdFusion ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions | n/a |
Timeline
Added to Industry KEV feed
Oct 20, 2020
Publicly disclosed
Mar 23, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Oct 21, 2025
Weakness Type
- CWE-502 Deserialization of Untrusted Data
References
- advisoryhttps://helpx.adobe.com/security/products/coldfusion/apsb18-14.html
- advisoryhttps://www.bleepingcomputer.com/news/security/critical-code-execution-vulnerability-fixed-in-adobe-coldfusion/Critical
- advisoryhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-4939
- advisoryhttps://www.cybersecurity-help.cz/vdb/SB2021032222
- advisoryhttps://www.cybersecurity-help.cz/vdb/SB2021032222Remote
FAQ
Common Questions.
Adobe ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions have an exploitable Deserialization of Untrusted Data vulnerability.
Affected: Coldfusion (Adobe) versions 11.0, 11.0-update1, 11.0-update10, 11.0-update11, 11.0-update12, 11.0-update13, 11.0-update2, 11.0-update3; Adobe ColdFusion ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions versions >= Adobe ColdFusion ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 20, 2020.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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