Adobe Flash Player

CVE-2015-5123: Adobe Flash Player Use-After-Free Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 13 Apr 2022, 2,465 days after the CVE record was published.

How likely is exploitation in the next 30 days?

18.8%

EPSS score, percentile 97.3 of all scored records

How severe?

7.8 High

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

CISA deadline 4 May 2022. The impacted product is end-of-life and should be disconnected if still in use.

Advisories and patches (7)

Which versions are affected?

Not stated. The CVE record gives vendor and product as “n/a” and the version as “unspecified”.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

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

CISA due date for this action: 4 May 2022.

Advisories and patches

SUSE-SU-2015:1255 (Vendor advisory)
HPSBMU03409 (Vendor advisory)
SUSE-SU-2015:1258 (Vendor advisory)
GLSA-201508-01 (Vendor advisory)
HPSBHF03509 (Vendor advisory)
RHSA-2015:1235 (Vendor advisory)
openSUSE-SU-2015:1267 (Vendor advisory)

Linked from CISA's catalog entry

https://nvd.nist.gov/vuln/detail/CVE-2015-5123

Affected products and versions

The CVE record does not name affected products or versions: vendor and product are “n/a” and the version is “unspecified”.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Use-after-free vulnerability in the BitmapData class in the ActionScript 3 (AS3) implementation in Adobe Flash Player allows remote attackers to execute code or cause a denial-of-service (DoS).

Summary: CISA's KEV catalog, as of 28 Oct 2026.

CISA added CVE-2015-5123 to its Known Exploited Vulnerabilities (KEV) catalog on 13 Apr 2022.
CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
The due date CISA sets for the required action is 4 May 2022.
The CVE record was published on 14 Jul 2015, 2,465 days before it was added to KEV.
The CVE record carries a CVSS v3.1 base score of 7.8 (High), taken from CISA's enrichment of the record.
FIRST's EPSS model puts the probability of exploitation in the next 30 days at 18.8% (percentile 97.3), as of 28 Oct 2026.
CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

CWE-416: Use After Free

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

Date	Event
14 Jul 2015	CVE record published
13 Apr 2022	Added to CISA KEV
4 May 2022	CISA due date for the required action
17 Nov 2025	CVE record last updated

References

TA15-195A (Third-party advisory)
VU#918568 (Third-party advisory)
1032890 (Vulnerability database)
75710 (Vulnerability database)
blog.trendmicro.com

2 more in the CVE record.

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