CVE-2020-0939

Memory disclosure via metadata-key out-of-bounds read

Published Apr 15, 2020 · Updated Aug 4, 2024

Out-of-bounds read in Microsoft Media Foundation on Windows 10 and Windows Server 1903/1909 allows attackers to disclose memory via a malformed MOV file. CQTMetadataKeysAtom::GetKeyForIndex trusts a declared metadata-key index after parsing stores fewer keys than the QuickTime keys atom declares, then reads a DWORD beyond the container. Opening or previewing the crafted file is required, and the grounded consequence is disclosure of process memory without reported integrity or availability impact.

CVSS severity5.5
Medium
EPSS probability8.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Microsoft Media Foundation on Windows 10 and Windows Server 1903/1909 allows attackers to disclose memory via a malformed MOV file. CQTMetadataKeysAtom::GetKeyForIndex trusts a declared metadata-key index after parsing stores fewer keys than the QuickTime keys atom declares, then reads a DWORD beyond the container. Opening or previewing the crafted file is required, and the grounded consequence is disclosure of process memory without reported integrity or availability impact.

The record

CVE
CVE-2020-0939
Published
Apr 15, 2020
Updated
Aug 4, 2024
Vendor
Microsoft
Product
Windows 10 Version 1909
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=unspecified

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Windows 10 Version 1909version=unspecified
Microsoft · Windows Server, version 1903 (Server Core installation)version=unspecified
Microsoft · Windows Server, version 1909 (Server Core installation)version=unspecified
Microsoft · Windows 10 Version 1903version=unspecified

Published CVSS scores

6.5Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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