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UK Cyber Defence
VulnerabilityAnalyzed

CVE-2015-5122

Adobe Flash Player Use-After-Free Vulnerability

KEVEXPLOIT ✓CRITICAL 9.8EPSS 87.0%

Does this matter?

Known to be exploited in the wild (CISA KEV, CISA remediation deadline 4 May 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.

Description

Use-after-free vulnerability in the DisplayObject 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 leverages improper handling of the opaqueBackground property, as exploited in the wild in July 2015.

CVSS 3.1
9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
87.03% probability · 100th percentile
Public exploits
1 in Exploit-DB · verified · first 13 July 2015
CISA KEV
Listed 13 April 2022 · due 4 May 2022
Weakness
CWE-416
Affected
adobe/flash player · adobe/flash player desktop runtime · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server eus · redhat/enterprise linux workstation · opensuse/evergreen · suse/linux enterprise desktop · suse/linux enterprise workstation extension
Source
psirt@adobe.com
EPSS trend
0%45%90%25 October 2026: 87.03%30 October 2026: 87.03%25 October 202630 October 2026

EPSS moved from 87.0% on 25 October 2026 to 87.0% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

CISA notes

The impacted product is end-of-life and should be disconnected if still in use. https://nvd.nist.gov/vuln/detail/CVE-2015-5122

Public exploits (1)

Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.

EDB-IDTitleTypePublishedVerified
EDB-37599source ↗Adobe Flash - opaqueBackground Use-After-Free (Metasploit)windows · Metasploitremote13 July 2015yes

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.