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Fencer Intel
critical 9.8

CVE-2018-4877 json

A use-after-free vulnerability was discovered in Adobe Flash Player before 28.0.0.161.

published 2018-02-06 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16662

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.3%
EPSS 8.3% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

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.

Patch / fix

  • adobe flash_player 28.0.0.161
  • flashplugin-nonfree Ubuntu 14.04 LTS 28.0.0.161ubuntu0.14.04.1
  • flashplugin-nonfree Ubuntu 16.04 LTS 28.0.0.161ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2018-4877

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • flash-plugin RHEL 6 EXTRAS 28.0.0.161-1.el6_9

red hat advisories RHSA-2018:0285

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-4877 updated cvss 8.8

flash-plugin: use-after-free causing remote code execution (APSB18-03)

  • Red Hat Enterprise Linux Desktop Supplementary (v. 6) flash-plugin 28.0.0.161-1.el6_9 Red Hat Enterprise Linux Server Supplementary (v. 6) flash-plugin 28.0.0.161-1.el6_9 Red Hat Enterprise Linux Workstation Supplementary (v. 6) flash-plugin 28.0.0.161-1.el6_9
    fixed: vendor fix RHSA-2018:0285

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

8.35% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • n/a Adobe Flash Player before 28.0.0.161

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.