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Fencer Vulns
high 8.8

CVE-2020-0688 kev+ ransomware in the critical feed json

A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory, a…

published 2020-02-11 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-2181

cvss
8.8
version 3.1, CNA
cisa kev
Exploited
added 2021-11-03, used in ransomware
epss
100.0%
EPSS 100.0% chance of exploitation in 30 days, percentile 99.9%
public exploits
3
Metasploit, Exploit-DB

Summary

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'.

Patch / fix

cisa required action Apply updates per vendor instructions.

Timeline

  1. First public exploit (Metasploit exploit/windows/http/exchange_ecp_viewstate)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
5 y ago
Patch by
2022-05-03 (4 y ago)
Ransomware
Known to be used in ransomware campaigns
Required action
Apply updates per vendor instructions.
Vendor, product
Microsoft, Exchange Server
CISA name
Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability

Ransomware

Groups reported to have exploited it in intrusions.

  • Conti ransomware gang

reported by tenable.com

Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1190 Exploit Public-Facing Application exploitation
  • T1110 Brute Force primary impact
  • T1114 Email Collection primary impact
  • T1505.003 Web Shell secondary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

99.95% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/windows/http/exchange_ecp_viewstate Exchange Control Panel ViewState Deserialization metasploit exploit, excellent rank, 2020-02-11
  • EDB-48168 Exchange Control Panel - Viewstate Deserialization (Metasploit) remote, 2020-03-05
  • EDB-48153 Microsoft Exchange 2019 15.2.221.12 - Authenticated Remote Code Execution remote, 2020-03-02
  • packetstormsecurity.com http://packetstormsecurity.com/files/156592/Microsoft-Exchange-2019-15.2.221.12-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/156620/Exchange-Control-Panel-Viewstate-Deserialization.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C

Affected products

  • Microsoft Microsoft Exchange Server 2013
  • Microsoft Microsoft Exchange Server 2019 Cumulative Update 3
  • Microsoft Microsoft Exchange Server 2016 Cumulative Update 14
  • Microsoft Microsoft Exchange Server 2016 Cumulative Update 15
  • Microsoft Microsoft Exchange Server 2019 Cumulative Update 4
  • Microsoft Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 30

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.