How severe is CVE-2015-5123?

CVE-2015-5123 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2015-5123?

Affected package information for CVE-2015-5123 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2015-5123?

No fixed version has been published for CVE-2015-5123 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-2015-5123 actively exploited in the wild?

Yes. There are 3 known exploit references for CVE-2015-5123, including 3 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-2015-5123?

CVE-2015-5123 has an EPSS (Exploit Prediction Scoring System) score of 41.0%, placing it in the 97th 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. This score warrants monitoring and prompt remediation.

Is CVE-2015-5123 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2015-5123 (Adobe Flash Player Use-After-Free Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-04-13. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-04. The required action was: The impacted product is end-of-life and should be disconnected if still in use. 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-2015-5123?

CVE-2015-5123 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-2015-5123?

CVE-2015-5123 affects adobe flash player; adobe flash player desktop runtime; opensuse evergreen (1 version, e.g. 11.4); redhat enterprise linux desktop (2 versions, e.g. 5.0, 6.0), and 5 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2015-5123 published, and has it been updated?

CVE-2015-5123 was published on July 14, 2015 and was last updated on April 21, 2026. 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 2022-04-13 — agencies required to remediate by 2022-05-04

CVE-2015-5123

CRITICAL

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…

Published

Jul 14, 2015

Updated

Apr 21, 2026

Affected

0 pkgs

Patched

None yet

Exploits

3 known

EPSS Exploitation Probability

via FIRST.org ↗

41.0%probability of exploitation in next 30 days

High Risk97th 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

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.

Affected Products

9 products · 16 configurations

Application

flash playeradobe

≥ 18.0 && ≤ 18.0.0.203

range

Application

flash player desktop runtimeadobe

≥ 18.0 && ≤ 18.0.0.203

range

evergreenopensuse

1 version

11.4

enterprise linux desktopredhat

2 versions

5.06.0

enterprise linux serverredhat

2 versions

5.06.0

enterprise linux server eusredhat

1 version

6.6

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.

Use-after-free vulnerability in the BitmapData class in the ActionScript…

helpx.adobe.comGoogle-sheetJul 2015

Use-after-free vulnerability in the BitmapData class in the ActionScript…

nvd.nist.govNVDOct 2019

Use-after-free vulnerability in the BitmapData class in the ActionScript…

cisa.govCISAApr 2022

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2015-5123 in your stack?

O3 detects CVE-2015-5123 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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