CVE DATABASE / CVE-2021-27085
CVE-2021-27085
Microsoft Internet Explorer Remote Code Execution Vulnerability
CVSS 8.8 · HIGH
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2021-11-03.
Federal remediation due 2021-11-17.
Required action: Apply updates per vendor instructions.
Summary
Internet Explorer Remote Code Execution Vulnerability
CVSS 3.1 breakdown
| Base score | 8.8 (HIGH) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | CHANGED |
| Confidentiality | LOW |
| Integrity | HIGH |
| Availability | LOW |
Affected products
Microsoft internet explorerMicrosoft windows 10 1803Microsoft windows 10 1809Microsoft windows 10 1909Microsoft windows 10 2004Microsoft windows 10 20h2Microsoft windows server 2019
Check this CVE live
Use our free CVE Lookup tool for the latest NVD record, or browse the full CISA KEV catalog.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27085
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27085
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-30. Always verify against the vendor advisory before acting.