CVE-2020-1464
A spoofing vulnerability exists when Windows incorrectly validates file signatures. An attacker who successfully exploited this vulnerability could bypass security features and load improperly signed files. In an attack scenario, an attacker could bypass security features intended to prevent improperly signed files from being loaded. The update addresses the vulnerability by correcting how Windows validates file signatures.
Key facts
- CVSS score
- 7.8 (v3.1)
- Severity
- HIGH
- CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
- CWE-347
- EPSS score
- 38.9% (99th percentile)
- In CISA KEV
- Yes, added November 3, 2021
- In EU EUVD
- Yes (EUVD-2020-12339)
- Published
- August 17, 2020
- NVD last modified
- June 17, 2026
- Status
- Analyzed
CISA Known Exploited Vulnerability
Microsoft Windows Spoofing Vulnerability
Added to the KEV catalog on November 3, 2021; federal remediation due May 3, 2022.
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2020-12339 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 21, 2025.
View on the EU Vulnerability DatabaseAffected products
- microsoft / windows 10 1507
- microsoft / windows 10 1607
- microsoft / windows 10 1709
- microsoft / windows 10 1803
- microsoft / windows 10 1809
- microsoft / windows 10 1903
- microsoft / windows 10 1909
- microsoft / windows 10 2004
- microsoft / windows 7
- microsoft / windows 8.1
- microsoft / windows rt 8.1
- microsoft / windows server 1903
- microsoft / windows server 1909
- microsoft / windows server 2004
- microsoft / windows server 2008
- microsoft / windows server 2008
- microsoft / windows server 2012
- microsoft / windows server 2012
- microsoft / windows server 2016
- microsoft / windows server 2019
Certified products that may be affected
2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- Windows 7 BitLocker™ Drive Encryption - Microsoft Corporation - FIPS 140 1332 - historical
- Microsoft Windows 7 Kernel Mode Cryptographic Primitives Library (cng.sys) - Microsoft Corporation - FIPS 140 1328 - historical
References
- https://blog.virustotal.com/2019/01/distribution-of-malicious-jar-appended.html(Third Party Advisory)
- https://krebsonsecurity.com/2020/08/microsoft-put-off-fixing-zero-day-for-2-years/(Issue Tracking, Third Party Advisory)
- https://medium.com/%40TalBeerySec/glueball-the-story-of-cve-2020-1464-50091a1f98bd(Exploit, Third Party Advisory)
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1464(Patch, Vendor Advisory)
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1464(US Government Resource)
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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