How severe is CVE-2020-1380?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2020-1380 known to be exploited?

Yes. CVE-2020-1380 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 6 public proof-of-concept repositories are indexed.

Vulnerability in Microsoft Internet Explorer 11

CVE-2020-1380

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the con…

EPSS: 0.917 (99.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/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: 2022-05-03.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1380 (x_refsource_MISC)
packetstormsecurity.com/files/163056/Internet-Explorer-jscript9.dll-Memory-Corr… (x_refsource_MISC)

Frequently asked questions

What is CVE-2020-1380?: CVE-2020-1380 is a high-severity vulnerability in Microsoft Internet Explorer 11. CVSS score: 7.8/10. Published 2020-08-17.
How severe is CVE-2020-1380?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2020-1380 known to be exploited?: Yes. CVE-2020-1380 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 6 public proof-of-concept repositories are indexed.