CVE-2015-8651: Adobe Flash Player Integer Overflow Vulnerability

Q: How do I fix CVE-2015-8651?

air sdk: upgrade to 20.0.0.233; air sdk \& compiler: upgrade to 20.0.0.233; flash player: upgrade to 11.2.202.559, 18.0.0.324, 20.0.0.267. Exact commands for each OS are on this page.

Q: Is CVE-2015-8651 being exploited?

Yes. CVE-2015-8651 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2015-8651 affect?

CVE-2015-8651 affects air sdk, air sdk \& compiler, flash player. Severity is high (CVSS 8.8). Integer overflow in Adobe Flash Player before 18.0.0.324 and 19.x and 20.x before 20.0.0.267 on Windows and OS X and before 11.2.202.559 on Linux, Adobe AIR before 20.0.0.233, Adobe AIR SDK before 20.0.0.233, and Adobe AIR SDK & Compiler be

Q: How urgent is CVE-2015-8651?

Priority 86/100. High severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); On your watchlist

Patch now

HIGH 8.8EXPLOITEDWATCHLISTUPGRADEUPGRADEUPGRADE

CVE-2015-8651 is a high-severity flaw (CVSS 8.8) affecting air sdk, air sdk \& compiler, flash player, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer overflow in Adobe Flash Player before 18.0.0.324 and 19.x and 20.x before 20.0.0.267 on Windows and OS X and before 11.2.202.559 on Linux, Adobe AIR before 20.0.0.233, Adobe AIR SDK before 20.0.0.233, and Adobe AIR SDK & Compiler before 20.0.0.233 allows attackers to execute arbitrary code via unspecified vectors.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Exploited in the wild (CISA KEV)
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	67.7% (top 1%)
CISA exploited list	Yes, fix due 2022-06-15
Weakness	CWE-190
Published	2015-12-28
Last modified	2026-06-17

Publisher (CNA): Adobe Systems Incorporated · Vendor: adobe · redhat

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-12-28 23:59 UTCPublished CVE record published
2022-05-25Exploited Added to the CISA Known Exploited Vulnerabilities list
2022-06-15Deadline CISA due date for US federal agencies to patch
2026-06-17 00:34 UTCUpdated Record last modified

adobe air sdk UPGRADE

Affected: < 20.0.0.233

Fixed in: 20.0.0.233

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy air-sdk || rpm -q air-sdk || air-sdk --version

2. UPGRADE to 20.0.0.233 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade air-sdk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade air-sdk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

adobe air sdk \& compiler UPGRADE

Affected: < 20.0.0.233

Fixed in: 20.0.0.233

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy air-sdk--compiler || rpm -q air-sdk--compiler || air-sdk--compiler --version

2. UPGRADE to 20.0.0.233 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade air-sdk--compiler

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade air-sdk--compiler

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

adobe flash player UPGRADE

Affected: < 11.2.202.559 · < 18.0.0.324 · >= 19.0.0.185 and < 20.0.0.267

Fixed in: 11.2.202.559, 18.0.0.324, 20.0.0.267

Safe to downgrade to: a release before 19.0.0.185

1. Check installed version

apt-cache policy flash-player || rpm -q flash-player || flash-player --version

2. UPGRADE to 11.2.202.559 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flash-player

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flash-player

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 19.0.0.185 (Debian / Ubuntu)

apt-cache madison flash-player sudo apt install flash-player=<VERSION_BEFORE_19.0.0.185> sudo apt-mark hold flash-player

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list flash-player sudo dnf downgrade flash-player-<VERSION_BEFORE_19.0.0.185> sudo dnf versionlock add flash-player

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

adobe air UPGRADE

Affected: < 20.0.0.233

Fixed in: 20.0.0.233

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy air || rpm -q air || air --version

2. UPGRADE to 20.0.0.233 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade air

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade air

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

redhat enterprise linux desktop MITIGATE

Affected: 5.0 · 6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat enterprise linux server MITIGATE

Affected: 5.0 · 6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · perl-Net-IDN-Encode · FIXED · 2.600-1.fc46 · FEDORA-2026-84eff0ea64 · source

sudo dnf upgrade --advisory=FEDORA-2026-84eff0ea64

Fedora ELN · libXISF · FIXED · 0.2.15-2.eln159 · FEDORA-2026-b9e2d1bda0 · source

sudo dnf upgrade --advisory=FEDORA-2026-b9e2d1bda0

RHEL 5 Supplementary · flash-plugin · FIXED · flash-plugin-11.2.202.559-1.el5

sudo dnf upgrade --advisory=RHSA-2015:2697 rpm -q flash-plugin

RHEL 6 Supplementary · flash-plugin · FIXED · flash-plugin-11.2.202.559-1.el6_7

sudo dnf upgrade --advisory=RHSA-2015:2697 rpm -q flash-plugin

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05356388
Write-up: h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05385680
Write-up: h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722
GitHub PoC: Gitlabpro/The-analysis-of-the-cve-2015-8651

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-8651?

air sdk: upgrade to 20.0.0.233; air sdk \& compiler: upgrade to 20.0.0.233; flash player: upgrade to 11.2.202.559, 18.0.0.324, 20.0.0.267. Exact commands for each OS are on this page.

Is CVE-2015-8651 being exploited?

Yes. CVE-2015-8651 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2015-8651 affect?

CVE-2015-8651 affects air sdk, air sdk \& compiler, flash player. Severity is high (CVSS 8.8). Integer overflow in Adobe Flash Player before 18.0.0.324 and 19.x and 20.x before 20.0.0.267 on Windows and OS X and before 11.2.202.559 on Linux, Adobe AIR before 20.0.0.233, Adobe AIR SDK before 20.0.0.233, and Adobe AIR SDK & Compiler be

How urgent is CVE-2015-8651?

Priority 86/100. High severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); On your watchlist

Software pages

Windows vulnerabilities · Adobe Flash vulnerabilities

Related CVEs

CVE-2016-4163 CRITICAL 9.8 UPGRADE UPGRADE Adobe Flash Player before 18.0.0.352 and 19.x through 21.x before 21.0.0.242 on Windows and OS X and before 11
CVE-2016-4162 CRITICAL 9.8 UPGRADE UPGRADE Adobe Flash Player before 18.0.0.352 and 19.x through 21.x before 21.0.0.242 on Windows and OS X and before 11
CVE-2016-4161 CRITICAL 9.8 UPGRADE UPGRADE Adobe Flash Player before 18.0.0.352 and 19.x through 21.x before 21.0.0.242 on Windows and OS X and before 11
CVE-2016-4160 CRITICAL 9.8 UPGRADE UPGRADE Adobe Flash Player before 18.0.0.352 and 19.x through 21.x before 21.0.0.242 on Windows and OS X and before 11
CVE-2016-4121 CRITICAL 9.8 UPGRADE UPGRADE Use-after-free vulnerability in Adobe Flash Player before 18.0.0.352 and 19.x through 21.x before 21.0.0.242 o

References

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