What is the CVSS score of CVE-2020-0938?

CVE-2020-0938 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 69.2%.

Is CVE-2020-0938 being actively exploited?

Yes, CVE-2020-0938 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, confirming active in-the-wild exploitation. Immediate patching is required.

Is there a patch available for CVE-2020-0938?

Yes, a patch is available for CVE-2020-0938. Update the affected software to the latest version immediately.

Windows 10 1507 CVE-2020-0938

HIGH

Out-of-bounds Write (CWE-787)

2020-04-15 secure@microsoft.com

RCE Buffer Overflow Memory Corruption Microsoft Adobe Windows 10 1507 Windows 10 1607 Windows 10 1809 Windows Server 2008 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows 7 Windows 8 1 Windows Rt 8 1 Windows 10 1909 Windows 10 1709 Windows 10 1803 Windows Server 1803 Windows 10 1903 Windows Server 1903 Windows Server 1909

7.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-787 ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, write limits MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.8 (HIGH). Attack characteristics: local attack vector, low complexity, no privileges required, user interaction required.
Exploit ScenarioDerived	A local attacker with access to the system could write data beyond allocated buffer boundaries leading to code execution or crashes. No authentication is required to exploit this vulnerability.

This Week Schedule remediation this week. Why: In CISA KEV with patch available.

Exploited in the wild (CISA KEV) Patch available 69.2% exploitation probability (EPSS)

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AnalysisAI

A remote code execution vulnerability exists in Microsoft Windows when the Windows Adobe Type Manager Library improperly handles a specially-crafted multi-master font - Adobe Type 1 PostScript. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity. This Out-of-bounds Write vulnerability could allow attackers to write data beyond allocated buffer boundaries leading to code execution or crashes.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate write boundaries, use memory-safe languages, enable compiler protections (ASLR, stack canaries).

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Out-of-bounds Write (CWE-787), which allows attackers to write data beyond allocated buffer boundaries leading to code execution or crashes. A remote code execution vulnerability exists in Microsoft Windows when the Windows Adobe Type Manager Library improperly handles a specially-crafted multi-master font - Adobe Type 1 PostScript format.For all systems except Windows 10, an attacker who successfully exploited the vulnerability could execute code remotely, aka 'Adobe Font Manager Library Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1020. Affected products include: Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1709, Microsoft Windows 10 1803, Microsoft Windows 10 1809.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.8 HIGH

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Apr 15, 2020 - 15:15 nvd

HIGH 7.8

DescriptionNVD

A remote code execution vulnerability exists in Microsoft Windows when the Windows Adobe Type Manager Library improperly handles a specially-crafted multi-master font - Adobe Type 1 PostScript format.For all systems except Windows 10, an attacker who successfully exploited the vulnerability could execute code remotely, aka 'Adobe Font Manager Library Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1020.

Threat Intelligence Overview

EPSS Score

69.2%

Top 1% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

CISA KEV

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV Yes

Public POC No

EPSS 69.2%

Patch available Yes

Active threat Yes

Deciding rule

In CISA KEV with patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Active

System Exposure· derived

Small

Automatable· derived

Human Impact· derived

High

Priority Score

158

Low Medium High Critical

KEV: +50

EPSS: +69

CVSS: +39

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)NVD

cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0938 REF http://packetstormsecurity.com/files/161299/Apple-CoreText-libFontParser.dylib-Stack-Corruption.html REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0938

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