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CVE-2016-0959: Use after free vulnerability in Adobe Flash Player Desktop Runtime before 20.0.0.267, Adobe Flash Player Exten

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CRITICAL 9.8REMOTEWATCHLISTUPGRADEUPGRADEUPGRADE

CVE-2016-0959 is a critical-severity flaw (CVSS 9.8) affecting flash player, flash player extended support release, flash player. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Use after free vulnerability in Adobe Flash Player Desktop Runtime before 20.0.0.267, Adobe Flash Player Extended Support Release before 18.0.0.324, Adobe Flash Player for Google Chrome before 20.0.0.267, Adobe Flash Player for Microsoft Edge and Internet Explorer 11 before 20.0.0.267, Adobe Flash Player for Internet Explorer 10 and 11 before 20.0.0.267, Adobe Flash Player for Linux before 11.2.202.559, AIR Desktop Runtime before 20.0.0.233, AIR

Why this priority

  • Critical severity
  • EPSS top 8%: very likely to be exploited
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance5.2% (top 8%)
CISA exploited listNo
WeaknessCWE-416
Published2017-06-27
Last modified2026-06-17
Publisher (CNA): Adobe Systems Incorporated · Vendor: adobe

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

adobe flash player UPGRADE
Affected: <= 20.0.0.235
Fixed in: newer than 20.0.0.235
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flash-player || rpm -q flash-player || flash-player --version
2. UPGRADE to newer than 20.0.0.235 (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.
adobe flash player extended support release UPGRADE
Affected: <= 18.0.0.268
Fixed in: newer than 18.0.0.268
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flash-player-extended-support-release || rpm -q flash-player-extended-support-release || flash-player-extended-support-release --version
2. UPGRADE to newer than 18.0.0.268 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade flash-player-extended-support-release
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade flash-player-extended-support-release
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
adobe flash player UPGRADE
Affected: <= 20.0.0.228
Fixed in: newer than 20.0.0.228
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flash-player || rpm -q flash-player || flash-player --version
2. UPGRADE to newer than 20.0.0.228 (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.
adobe flash player UPGRADE
Affected: <= 20.0.0.228
Fixed in: newer than 20.0.0.228
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flash-player || rpm -q flash-player || flash-player --version
2. UPGRADE to newer than 20.0.0.228 (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.
adobe flash player UPGRADE
Affected: <= 20.0.0.228
Fixed in: newer than 20.0.0.228
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flash-player || rpm -q flash-player || flash-player --version
2. UPGRADE to newer than 20.0.0.228 (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.
adobe flash player for linux UPGRADE
Affected: <= 11.2.202.554
Fixed in: newer than 11.2.202.554
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy flash-player-for-linux || rpm -q flash-player-for-linux || flash-player-for-linux --version
2. UPGRADE to newer than 11.2.202.554 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade flash-player-for-linux
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade flash-player-for-linux
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · 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-2016-0959?

flash player: upgrade to newer than 20.0.0.235; flash player extended support release: upgrade to newer than 18.0.0.268; flash player: upgrade to newer than 20.0.0.228. Exact commands for each OS are on this page.

Is CVE-2016-0959 being exploited?

CVE-2016-0959 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-0959 affect?

CVE-2016-0959 affects flash player, flash player extended support release, flash player. Severity is critical (CVSS 9.8). Use after free vulnerability in Adobe Flash Player Desktop Runtime before 20.0.0.267, Adobe Flash Player Extended Support Release before 18.0.0.324, Adobe Flash Player for Google Chrome before 20.0.0.267, Adobe Flash Player for Microsoft Ed

How urgent is CVE-2016-0959?

Priority 67/100. Critical severity; EPSS top 8%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Microsoft Edge vulnerabilities · Google Chrome vulnerabilities · Adobe Flash vulnerabilities · Internet Explorer vulnerabilities

Related CVEs

References

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