Is CVE-2018-4878 in the CISA KEV catalog?

Yes. CVE-2018-4878 is on the CISA Known Exploited Vulnerabilities list, added 2021-11-03, and has known ransomware campaign use.

What is the CVSS severity of CVE-2018-4878?

CVE-2018-4878 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2018-4878?

CVE-2018-4878 has an EPSS score of 89.53% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-4878?

Upgrade Clean Flash Player 34.0.0.330 Installer to 28.0.0.161 or later.

CVE & CISA-KEV Catalog

CVE-2018-4878

HIGHCISA KEVEPSS 100th pctl

7.8

CVSS v3

NVD

Description

A use-after-free vulnerability was discovered in Adobe Flash Player before 28.0.0.161. This vulnerability occurs due to a dangling pointer in the Primetime SDK related to media player handling of listener objects. A successful attack can lead to arbitrary code execution. This was exploited in the wild in January and February 2018.

CWE-416Use After Free

How to fix

Remediation Available

Clean Flash Player 34.0.0.330 InstallerWindows application

Affected:28.0.0.161Fixed in:28.0.0.161

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

89.53%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Adobe Flash Player Use-After-Free Vulnerability

Adobe Flash Player contains a use-after-free vulnerability that could allow for code execution.

The impacted product is end-of-life and should be disconnected if still in use.

Remediation due: 2022-05-03

Associated with ransomware campaigns

References

Exploit2

Vendor Advisory1

helpx.adobe.com

Third-Party Advisory10

Issue Tracking1

github.com

Other references2

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-18.