CVE-2021-27085
KEVMicrosoft Internet Explorer Remote Code Execution Vulnerability
Description
Microsoft Internet Explorer contains an unspecified vulnerability that allows for remote code execution.
Internet Explorer Remote Code Execution Vulnerability
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:LPublishedMar 11, 2021
Last modifiedAug 19, 2026
Added to KEVNov 3, 2021
Remediation dueNov 17, 2021
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27085PatchVendor Advisory
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27085PatchVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27085US Government Resource
0 recent articles mention this CVE
75
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1806 days
- CVSS
- 8.8 HIGH
- EPSS (30-day exploit probability)
- 5.4% · top 7% of all CVEs
- Weakness
- NVD-CWE-noinfo
- Attack vector
- Network, remotely reachable
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.