CISA KEV · Known exploitedCritical

CVE-2015-5123

Adobe Flash Player

Use-after-free vulnerability in the BitmapData class in the ActionScript 3 (AS3) implementation in Adobe Flash Player 13.x through 13.0.0.302 on Windows and OS X, 14.x through 18.0.0.203 on Windows and OS X, 11.x through 11.2.202.481 on Linux, and 12.x through 18.0.0.204 on Linux Chrome installations allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted Flash content that overrides a valueOf function, as exploited in the wild in July 2015.

CVSS: 9.8
EPSS: 18.5%
CISA KEV: Listed
Published: 2015.07.14

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability18.5%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Adobe Flash Player
Affected versions: 5.0, 6.0, 6.6, 11.4, 11, 12, >= 11.0 <= 11.2.202.481, >= 13.0 <= 13.0.0.302, >= 18.0 <= 18.0.0.203
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

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

Due date: 2022.05.04

1
Identify
Confirm that Adobe Flash Player and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-416
KEV added: 2022.04.13
Ransomware use: 미확인