CVE-2020-0938VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2020-0938: Microsoft Windows Adobe Font Manager Library Remote Code Execution Vulnerability

Affects Microsoft WindowsSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 05/03/2022
EPSS: 69.0% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2020-0938 (opens in a new tab)

Description

CVE-2020-0938 is a remote code execution vulnerability in the Microsoft Windows Adobe Font Manager Library when processing specially crafted multi-master fonts in Adobe Type 1 PostScript format. This vulnerability affects all Windows systems except Windows 10. On Windows 10, exploitation results in code execution within a restricted AppContainer sandbox with limited privileges. The vulnerability has been exploited in the wild.

Summary

Microsoft Windows Adobe Font Manager Library contains an unspecified vulnerability in handling specially crafted multi-master fonts (Adobe Type 1 PostScript format) that allows remote code execution. Systems running Windows versions other than Windows 10 are fully vulnerable to remote code execution. On Windows 10, the attacker gains code execution but only within an AppContainer sandbox context, which limits privileges and capabilities. The vulnerability is tracked as CVE-2020-0938 and has been exploited in the wild.

Impact

Successful exploitation allows remote code execution. On non-Windows 10 systems, the attacker can execute arbitrary code with the privileges of the user. On Windows 10, code execution is limited to an AppContainer sandbox with restricted privileges, reducing the potential impact but still allowing some level of compromise. This vulnerability has been exploited in the wild, indicating active threat.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No specific patch or workaround information is provided in the available data. Users should monitor official Microsoft advisories for updates and apply patches once available.

Weaknesses

CWE-787Out-of-bounds Write (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:19:38 UTC

Weaknesses

References

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