Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability

Exploited · KEV 2021-11-03Public exploit codeCVE-2020-0674CWE-416

Exploited since 2021-11-03. No WAF vendor names it yet.

Edge rules

0/8

Our test

No exploit yet

CVSS

7.5

EPSS

86.9% Top 0.3%

Posts, 14d

Published

2020-02-11

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka 'Scripting Engine Memory Corruption Vulnerability'. This CVE ID is unique from CVE-2020-0673,… More

Edge coverage

Claimed by vendors

CloudflareBefore feed historyOlder than its feed AWSNo public claimNot named Microsoft AzureNo public claimNot named Google CloudBefore feed historyOlder than its feed FastlyBefore feed historyOlder than its feed F5Before feed historyOlder than its feed AkamaiNo public sourceNo public changelog OWASP CRSBefore feed historyOlder than its feed

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AI · answers from this page

Ask about CVE-2020-0674: who's covered, what to patch first, how vendors compare. I cite sources and won't help with attacks.

Workers AI (Llama 3.3). Can be wrong: check the cited source.

Severity, decoded

CVSS 3.1

7.5High

High · 7.5 / 10

Exploitable over the network under specific conditions, with no privileges and user interaction, leading to full loss of confidentiality, integrity and availability.

Over the internetNo login neededNeeds a user to actHard to pull offFull compromise

How the score is built8 metrics

Attack vectorAn attacker can reach it over the internet; no access to your network needed.
Network
Attack complexityThe attack only works when conditions outside the attacker's control line up.
High
Privileges requiredNo account or login is needed.
None
User interactionA user has to do something first, such as open a file or click a link.
Required
ScopeThe damage stays within the vulnerable component.
Unchanged
Confidentiality impactAn attacker can read all data the affected component holds, or the most sensitive parts of it.
High
Integrity impactAn attacker can change any data or files the affected component protects.
High
Availability impactAn attacker can take the component down completely or keep it from serving anyone.
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA's assessmentSSVC, from the CVE record

ExploitationActive

Attackers are exploiting this in the wild.

AutomatableNo

At least one step needs hands-on work, which slows mass attacks.

Technical impactTotal

A successful attack gives full control over the affected software or all of its data.

Public exploits

2 found

0 Metasploit2 Exploit-DB0 Scanner template0 GitHub PoCs

Exploit-DBMicrosoft Internet Explorer 11 and WPAD service 'Jscript.dll' - Use-After-Free2021-05-13 · local · windows_x86-64
Exploit-DBMicrosoft Internet Explorer 11 - Use-After-Free2020-11-17 · local · windows

Links are to third-party code: never run it outside an isolated lab.

Timeline

2020-02-11
CVE published
CVE List
2020-11-17
Exploit published on Exploit-DB
Microsoft Internet Explorer 11 - Use-After-Free
2021-11-03
Added to CISA KEV
Confirmed exploitation in the wild