CVE-2020-1277

Name: CVE-2020-1277
Creator: NVD / NIST
Published: 2020-06-09T20:15:18.193+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2020-1277 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An elevation of privilege vulnerability exists in Windows Installer because of the way Windows Installer handles certain filesystem operations.To exploit the vulnerability, an attacker would require unprivileged execution on the victim system, aka 'Windows Installer Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-1272, CVE-2020-1302, CVE-2020-1312.. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

Description

An elevation of privilege vulnerability exists in Windows Installer because of the way Windows Installer handles certain filesystem operations.To exploit the vulnerability, an attacker would require unprivileged execution on the victim system, aka 'Windows Installer Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-1272, CVE-2020-1302, CVE-2020-1312.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.70%

48.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Microsoft	Windows 10	1809
Microsoft	Windows 10	1903
Microsoft	Windows 10	1909
Microsoft	Windows 10	2004
Microsoft	Windows Server 2016	1903
Microsoft	Windows Server 2016	1909
Microsoft	Windows Server 2016	2004
Microsoft	Windows Server 2019	All versions

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1277Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1277Patch, Vendor Advisory

Timeline

Published: Jun 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-1277?

How severe is CVE-2020-1277?

CVE-2020-1277 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2020-1277?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-1277?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST