How severe is CVE-2018-4939?

CVE-2018-4939 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-4939 being actively exploited?

Yes. CVE-2018-4939 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2018-4939?

CVE-2018-4939 primarily affects Adobe Coldfusion. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-4939?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2018-4939 have an EU (EUVD) identifier?

Yes. CVE-2018-4939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-16724. It is also flagged as exploited in the EUVD (since 2021-11-03).

When was CVE-2018-4939 published?

CVE-2018-4939 was published on 2018-05-19 and last updated on 2026-06-17.

CVE-2018-4939

CVE-2018-4939 is a critical-severity vulnerability in Adobe Coldfusion with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03). The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 63% (99th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2021-11-03)
EU (EUVD) id: EUVD-2018-16724
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2021-11-03)
Weakness: CWE-502
Affected product: Adobe Coldfusion
Published: 2018-05-19
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2018-4939?: CVE-2018-4939 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-4939 being actively exploited?: Yes. CVE-2018-4939 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2018-4939?: CVE-2018-4939 primarily affects Adobe Coldfusion. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-4939?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2018-4939 have an EU (EUVD) identifier?: Yes. CVE-2018-4939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-16724. It is also flagged as exploited in the EUVD (since 2021-11-03).
When was CVE-2018-4939 published?: CVE-2018-4939 was published on 2018-05-19 and last updated on 2026-06-17.

References

Affected products (20)

cpe:2.3:a:adobe:coldfusion:11.0:-:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update1:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update10:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update11:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update12:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update13:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update2:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update3:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update4:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update5:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update6:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update7:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update8:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:11.0:update9:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:2016:-:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:2016:update1:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:2016:update2:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:2016:update3:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:2016:update4:*:*:*:*:*:*
cpe:2.3:a:adobe:coldfusion:2016:update5:*:*:*:*:*:*

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