CVE-2009-0956

CVE-2009-0956 is a critical-severity vulnerability in Apple Quicktime with a CVSS 2.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

• Severity: Critical (CVSS 2.0 base score 9.3)
• EPSS exploit prediction: 5% (91st percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-399
• Affected product: Apple Quicktime
• Published: 2009-06-02
• Last modified: 2026-06-16

Description

Apple QuickTime before 7.6.2 does not properly initialize memory before use in handling movie files, which allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a movie containing a user data atom of size zero.

Frequently asked questions

What is CVE-2009-0956?

Apple QuickTime before 7.6.2 does not properly initialize memory before use in handling movie files, which allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a movie containing a user data atom of size zero.

How severe is CVE-2009-0956?

CVE-2009-0956 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2009-0956 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0956?

CVE-2009-0956 primarily affects Apple Quicktime. In total, 127 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0956?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-0956 published?

CVE-2009-0956 was published on 2009-06-02 and last updated on 2026-06-16.

References

• http://lists.apple.com/archives/security-announce/2009/Jun/msg00000.html
• http://secunia.com/advisories/35091
• http://support.apple.com/kb/HT3591
• http://www.securityfocus.com/bid/35162
• http://www.securitytracker.com/id?1022314
• http://www.vupen.com/english/advisories/2009/1469
• https://exchange.xforce.ibmcloud.com/vulnerabilities/50896
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16188

Affected products (127)

• cpe:2.3:a:apple:quicktime:*:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:-:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:3.0:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:4.1.2:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:4.1.2:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:4.1.2:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:5.0:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:5.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:5.0.1:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:5.0.1:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:5.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:5.0.2:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:5.0.2:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0.0:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0.0:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0.1:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0.1:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0.2:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.0.2:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.1:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.1.0:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.1.0:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.1.1:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.1.1:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.2.0:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.2.0:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.3.0:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.3.0:-:windows:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.4.0:-:mac:*:*:*:*:*
• cpe:2.3:a:apple:quicktime:6.4.0:-:windows:*:*:*:*:*

More vulnerabilities in Apple Quicktime

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• CVE-2011-3428 — Critical (CVSS 9.8): Buffer overflow in QuickTime before 7.7.1 for Windows allows remote attackers to execute arbitrary code.
• CVE-2014-4979 — Critical (CVSS 9.3): Apple QuickTime allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via…
• CVE-2014-1251 — Critical (CVSS 9.3): Buffer overflow in Apple QuickTime before 7.7.5 allows remote attackers to execute arbitrary code or cause a denial of…
• CVE-2014-1250 — Critical (CVSS 9.3): Apple QuickTime before 7.7.5 does not properly perform a byte-swapping operation, which allows remote attackers to…

All CVEs affecting Apple Quicktime →

Other CWE-399 (Resource Management Errors) vulnerabilities

• CVE-2015-8104 — Critical (CVSS 10.0): The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a…
• CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
• CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

Browse all CWE-399 (Resource Management Errors) vulnerabilities →