Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability

Exploited · KEV 2021-11-03RansomwareMetasploit moduleCVE-2020-0688CWE-287

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

Edge rules

0/8

Our test

No exploit yet

CVSS

8.8

EPSS

100.0% Top 0.1%

Posts, 14d

Published

2020-02-11

A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory, aka 'Microsoft Exchange Memory Corruption Vulnerability'.

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-2020-0688: 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

8.8High

High · 8.8 / 10

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

Over the internetAny user loginNo user actionWorks reliablyFull compromise

How the score is built8 metrics

Attack vectorAn attacker can reach it over the internet; no access to your network needed.
Network
Attack complexityNo special conditions are needed; the attack works reliably.
Low
Privileges requiredThe attacker needs an ordinary user account.
Low
User interactionNo one has to click or open anything; the attack works on its own.
None
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:L/PR:L/UI:N/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

3 found

1 Metasploit2 Exploit-DB0 Scanner template0 GitHub PoCs

MetasploitExchange Control Panel ViewState Deserialization2020-02-11 · exploit · rank Excellent · has check
Exploit-DBExchange Control Panel - Viewstate Deserialization (Metasploit)2020-03-05 · remote · windows · verified
Exploit-DBMicrosoft Exchange 2019 15.2.221.12 - Authenticated Remote Code Execution2020-03-02 · remote · windows

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

Timeline

2020-02-11
CVE published
CVE List
2020-02-11
Metasploit module published
Exchange Control Panel ViewState Deserialization
2020-03-02
Exploit published on Exploit-DB
Microsoft Exchange 2019 15.2.221.12 - Authenticated Remote Code Execution
2021-11-03
Added to CISA KEV
Confirmed exploitation in the wild