How severe is CVE-2018-4878?

CVE-2018-4878 has a CVSS score of 7.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2018-4878?

Affected package information for CVE-2018-4878 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2018-4878?

No fixed version has been published for CVE-2018-4878 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2018-4878 actively exploited in the wild?

Yes. There are 16 known exploit references for CVE-2018-4878, including 3 documented proof-of-concept exploits on Exploit-DB and 9 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

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

CVE-2018-4878 has an EPSS (Exploit Prediction Scoring System) score of 93.5%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2018-4878 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2018-4878 (Adobe Flash Player Use-After-Free Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-03. The required action was: The impacted product is end-of-life and should be disconnected if still in use. This CVE has been used in known ransomware campaigns. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2018-4878?

CVE-2018-4878 is classified as Use After Free (CWE-416). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2018-4878?

CVE-2018-4878 affects adobe flash player; redhat enterprise linux desktop (1 version, e.g. 6.0); redhat enterprise linux server (1 version, e.g. 6.0); redhat enterprise linux workstation (1 version, e.g. 6.0). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2018-4878 published, and has it been updated?

CVE-2018-4878 was published on February 6, 2018 and was last updated on November 18, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2021-11-03 — agencies required to remediate by 2022-05-03 · Ransomware

CVE-2018-4878

HIGH

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…

Published

Feb 6, 2018

Updated

Nov 18, 2025

Affected

0 pkgs

Patched

None yet

Exploits

16 known

EPSS Exploitation Probability

via FIRST.org ↗

93.5%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Affected Products

4 products · 7 configurations

Application

flash playeradobe

< 28.0.0.161

range

enterprise linux desktopredhat

1 version

6.0

enterprise linux serverredhat

1 version

6.0

enterprise linux workstationredhat

1 version

6.0

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-44745localwindows

Flash ActiveX 28.0.0.137 - Code Execution (2)

by smgorelik · Feb 13, 2016

Exploit-DB Source

EDB-44412remotemultiple

Adobe Flash < 28.0.0.161 - Use-After-Free

by SyFi · Apr 6, 2018

Exploit-DB Source

EDB-44744localwindows

Flash ActiveX 28.0.0.137 - Code Execution (1)

by smgorelik · Feb 16, 2016

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2018-4878 in your stack?

O3 detects CVE-2018-4878 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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