What is CVE-2018-4877?

CVE-2018-4877 is a critical-severity vulnerability in Adobe Flash Player, classified under Use After Free. CVSS score: 9.8/10. Published 2018-02-06.

How severe is CVE-2018-4877?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Use After Free in Adobe Flash Player

CVE-2018-4877

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's quality of service functionality. A successful attack can lead to arbitrary code execution.

Vulnerability class: Use-After-Free

Published 2018-02-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.083 (94.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.083 · newest: 0.083 · change: 0.000

Affected products

Adobe Flash Player
Apple macOS
Google Chrome OS
Linux Kernel
Microsoft Windows
Microsoft Windows 10
Microsoft Windows 8.1
Red Hat Enterprise Linux Desktop — versions 6.0
Red Hat Enterprise Linux Server — versions 6.0
Red Hat Enterprise Linux Workstation — versions 6.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

helpx.adobe.com/security/products/flash-player/apsb18-03.html (Vendor Advisory)
access.redhat.com/errata/RHSA-2018:0285 (vendor-advisory, Third Party Advisory)
www.securityfocus.com/bid/102930 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-4877?: CVE-2018-4877 is a critical-severity vulnerability in Adobe Flash Player, classified under Use After Free. CVSS score: 9.8/10. Published 2018-02-06.
How severe is CVE-2018-4877?: Critical severity. CVSS v3 base score is 9.8 out of 10.