CVE-2020-0674Known exploitationPublic exploitNetwork attack vector

Remote code execution via JScript use-after-free

Published Feb 11, 2020 · Updated Oct 21, 2025

Memory corruption in Microsoft Internet Explorer 9 through 11 allows remote attackers to execute code via crafted content. The legacy jscript.dll engine uses an object after its memory has been freed, corrupting memory under attacker control. Exploitation requires user interaction with crafted HTML or another document embedding the engine, and legacy JScript must be selected instead of the default jscript9.dll; code runs as the current user.

CVSS severity7.5
High
EPSS probability86.86%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory corruption in Microsoft Internet Explorer 9 through 11 allows remote attackers to execute code via crafted content. The legacy jscript.dll engine uses an object after its memory has been freed, corrupting memory under attacker control. Exploitation requires user interaction with crafted HTML or another document embedding the engine, and legacy JScript must be selected instead of the default jscript9.dll; code runs as the current user.

The record

CVE
CVE-2020-0674
Published
Feb 11, 2020
Updated
Oct 21, 2025
Vendor
Microsoft
Product
Internet Explorer 10
Classifications
CWE-416, T1189, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2020CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Windows Server 2012

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Internet Explorer 10version=Windows Server 2012
Microsoft · Internet Explorer 11version=unspecified; version=Windows 10 for 32-bit Systems; version=Windows 10 for x64-based Systems; version=Windows 10 Version 1607 for 32-bit Systems; version=Windows 10 Version 1607 for x64-based Systems; version=Windows 10 Version 1709 for 32-bit Systems; version=Windows 10 Version 1709 for ARM64-based Systems; version=Windows 10 Version 1709 for x64-based Systems; version=Windows 10 Version 1803 for 32-bit Systems; version=Windows 10 Version 1803 for ARM64-based Systems; version=Windows 10 Version 1803 for x64-based Systems; version=Windows 10 Version 1809 for 32-bit Systems; version=Windows 10 Version 1809 for ARM64-based Systems; version=Windows 10 Version 1809 for x64-based Systems; version=Windows 7 for 32-bit Systems Service Pack 1; version=Windows 7 for x64-based Systems Service Pack 1; version=Windows 8.1 for 32-bit systems; version=Windows 8.1 for x64-based systems; version=Windows RT 8.1; version=Windows Server 2008 R2 for x64-based Systems Service Pack 1; version=Windows Server 2012 R2; version=Windows Server 2016; version=Windows Server 2019
Microsoft · Internet Explorer 9version=Windows Server 2008 for 32-bit Systems Service Pack 2; version=Windows Server 2008 for x64-based Systems Service Pack 2

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.6NVDAV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1189Drive-by Compromise
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo