CVE-2020-0938: in the CISA KEV catalogue

Microsoft Windows Adobe Font Manager Library Remote Code Execution Vulnerability. CISA added CVE-2020-0938 to the Known Exploited Vulnerabilities catalogue on 2021-11-03 with a default due date of 2022-05-03. Known ransomware campaign use: Unknown. Forensic triage flag: No.

Microsoft Windows Adobe Font Manager Library contains an unspecified vulnerability when handling specially crafted multi-master fonts (Adobe Type 1 PostScript format) that allows for remote code execution for all systems except Windows 10. For systems running Windows 10, an attacker who successfully exploited the vulnerability could execute code in an AppContainer sandbox context with limited privileges and capabilities. (CISA description)

Vendor / product: Microsoft Windows
CWE: CWE-787
CISA required action: Apply updates per vendor instructions.
EPSS: 69%, percentile 99 (scored 2026-11-03)

EPSS puts about 69 in 100 odds (69%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.

Vendor and reference links (from CISA)

https://nvd.nist.gov/vuln/detail/CVE-2020-0938

Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.

Data dates. CISA KEV catalogue version 2026.11.03, released 2026-11-03, 1,767 entries (checked 2026-11-03). EPSS model v2026.06.15, scored 2026-11-03, 399,388 CVEs. Sources: CISA and FIRST (EPSS by FIRST; scores generated by Empirical Security). Copied to our own database and refreshed automatically; if a refresh fails, the previous copy keeps serving with its own date.

Frequently asked questions

Is CVE-2020-0938 in the CISA KEV catalogue?

Yes. CISA added CVE-2020-0938 (Microsoft Windows Adobe Font Manager Library Remote Code Execution Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2021-11-03. CISA's default due date for it is 2022-05-03.

Is CVE-2020-0938 used in ransomware attacks?

CISA marks known ransomware campaign use as Unknown for CVE-2020-0938. That means CISA lacks confirmation, not that ransomware groups do not use it.

What should I do about CVE-2020-0938?

CISA's required action: Apply updates per vendor instructions.

Sources

CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
NVD record for CVE-2020-0938