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ExploitedIn CISA KEVFix available

CVE-2020-1020

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2020-04-15
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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-2020-0938.

Timeline

dates in UTC
  1. 2020-04-1515:15CVE publishedNVD
  2. 2021-11-03Added to the CISA KEV catalogCISA KEV
  3. 2021-11-03Listed as exploited by GCVEGCVE
  4. 2021-11-03Exploitation first reportedCISA KEV
  5. 2025-02-0715:14SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-1020?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-1020?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Microsoft windows server 2008
BranchAffectedFixed in
—all versionsno fix published
—= r2no fix published
Microsoft windows server 2012
BranchAffectedFixed in
—all versionsno fix published
—= r2no fix published
Microsoft windows 10 1507
BranchAffectedFixed in
—all versionsno fix published

13 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA10 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft Windows
    Affected
    • = 10 Version 1803 for 32-bit Systemsno fix stated
    • = 10 Version 1803 for x64-based Systemsno fix stated
    • = 10 Version 1803 for ARM64-based Systemsno fix stated
    • = 10 Version 1809 for 32-bit Systemsno fix stated
    • = 10 Version 1809 for x64-based Systemsno fix stated
    • = 10 Version 1809 for ARM64-based Systemsno fix stated
    • = 10 Version 1709 for 32-bit Systemsno fix stated
    • = 10 Version 1709 for x64-based Systemsno fix stated

    10 more version lines in the CVE record.

  • Microsoft Windows Server
    Affected
    • = version 1803 (Core Installation)no fix stated
    • = 2019no fix stated
    • = 2019 (Core installation)no fix stated
    • = 2016no fix stated
    • = 2016 (Core installation)no fix stated
    • = 2008 for 32-bit Systems Service Pack 2no fix stated
    • = 2008 for 32-bit Systems Service Pack 2 (Core installation)no fix stated
    • = 2008 for Itanium-Based Systems Service Pack 2no fix stated

    9 more version lines in the CVE record.

  • Microsoft Windows 10 Version 1909 for 32-bit Systems
  • Microsoft Windows 10 Version 1909 for x64-based Systems
  • Microsoft Windows 10 Version 1909 for ARM64-based Systems
  • Microsoft Windows Server, version 1909 (Server Core installation)

4 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-04-15

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2022-05-03

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedCrackerCat/CVE-2020-1020-ExploitKaLendsi/CVE-2020-1020
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2021-11-03
Patch Due Date
2022-05-03
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2020-04-15
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-jvx5-6596-c2vj

Frequently asked questions

What is CVE-2020-1020?

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-2020-0938.

Is CVE-2020-1020 actively exploited?

Yes. CVE-2020-1020 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-03.

What is the CVSS score for CVE-2020-1020?

CVE-2020-1020 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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Sources for this record