8.8

CVE-2021-27085: Microsoft Internet Explorer Remote Code Execution Vulnerability

CVSS: 8.8v3.1HighKEVAnalyzed
Published 11-03-2021Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2021-27085 is a high (CVSS 8.8) vulnerability in Microsoft Internet Explorer. It is known to be exploited: CISA lists it, first on 03-11-2021. EPSS estimates a 5.45% chance of exploitation in the next 30 days, higher than 92.6% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
5.45%
0%100%
Low · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-03-2021
    PublishedVulnerability first disclosed.
  2. 03-11-2021
    Added to CISA KEVMicrosoft Internet Explorer Remote Code Execution Vulnerability
  3. 17-11-2021
    CISA remediation dueApply updates per vendor instructions.
  4. 19-08-2026
    Last modifiedVulnerability information updated.

Description

Internet Explorer Remote Code Execution Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

5.45%

Chance of exploitation in the next 30 days

Percentile

93%

Versus all other CVEs

30-day change

0.00 pp

From 5.45% on 21-09-2026

21-09-202621-10-2026
EPSS score
5.45%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
03-11-2021
Federal due date
17-11-2021

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2021-27085

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft2 products

1 vendor · 2 products

References

3 links