How severe is CVE-2021-27085?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2021-27085 known to be exploited?

Yes. CVE-2021-27085 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

Vulnerability in Microsoft Internet Explorer 11

CVE-2021-27085

Internet Explorer Remote Code Execution Vulnerability

EPSS: 0.018 (83.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 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/E:P/RL:O/RC:C.

Affected products

Microsoft Internet Explorer 11 — versions 1.0.0

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2021-11-17.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27085 (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-27085?: CVE-2021-27085 is a high-severity vulnerability in Microsoft Internet Explorer 11. CVSS score: 8.8/10. Published 2021-03-11.
How severe is CVE-2021-27085?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-27085 known to be exploited?: Yes. CVE-2021-27085 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.