ExploitedIn CISA KEVFix available

CVE-2018-4878

Q: Is CVE-2018-4878 actively exploited?

Yes. CVE-2018-4878 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-03.

Q: What is the CVSS score for CVE-2018-4878?

CVE-2018-4878 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2018-02-06
Fixed in28.0.0.161
WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2018-02-0621:29CVE publishedNVD
2021-11-03Listed as exploited by GCVEGCVE
2021-11-03Exploitation first reportedCISA KEV
2021-11-03Added to the CISA KEV catalogCISA KEV
2025-11-1719:26SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-4878?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-4878?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Adobe flash playerversion to verify

Branch	Affected	Fixed in	Source
28.0	< 28.0.0.161	28.0.0.161	NVD

Redhat enterprise linux desktop

Branch	Affected	Fixed in	Source
6.0	= 6.0	no fix published	NVD

Redhat enterprise linux server

Branch	Affected	Fixed in	Source
6.0	= 6.0	no fix published	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Adobe flash player to 28.0.0.161
CISA’s required action: The impacted product is end-of-life and should be disconnected if still in use.due 2022-05-03

Advisories and patches

helpx.adobe.comVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 10 repositories, unverifiedydl555/CVE-2018-4878-tsondt/CVE-2018-4878demonsec666/CVE-2018-4878vysecurity/CVE-2018-4878KathodeN/CVE-2018-4878

CISA Known Exploited Vulnerability

Date Added: 2021-11-03
Patch Due Date: 2022-05-03
Ransomware Use: Known
Required Action: The impacted product is end-of-life and should be disconnected if still in use.

Sources

CISA KEVKEV entry2021-11-03
GCVEexploitation2021-11-03
CISA-ADPSSVC decisionactive2025-11-17
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.17.82025-02-04
NVDCVSS 3.17.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CISA-ADPweakness (CWE)CWE-4162025-02-04
NVDweakness (CWE)CWE-416read 2026-10-23
FIRST EPSSEPSS score89.5 %read 2026-10-23
PoC-in-GitHubproof of concept10read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: 2018-02-06
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2018-4878?

Is CVE-2018-4878 actively exploited?

Yes. CVE-2018-4878 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-03.

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

CVE-2018-4878 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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