What is the severity of CVE-2021-31196?

CVE-2021-31196 has a CVSS Base Score of 7.2/10 and is classified as High severity. It is important to assess the risk based on your specific environment.

How do I fix CVE-2021-31196?

Remediation typically involves updating the affected software products to the latest patched version. Refer to the 'Affected Products' and 'Remediation' sections on this page for specific mitigation steps and vendor advisories.

Home→Vulnerabilities→CVE-2021-31196

Active Exploitation

CVE-2021-31196

Microsoft Exchange Server Remote Code Execution Vulnerability

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Confirmed Active Exploitation

This vulnerability is listed in the CISA KEV Catalog. Federal agencies are mandated to patch immediately. Immediate remediation is required.

Exploitation Probability (EPSS)

Low Priority

3.34%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

4 events

Jul 14, 2021

Vulnerability Disclosed

Published to component-level vulnerability database.

Mar 7, 2025

Last Updated

Record updated with new analysis or tags.

Nov 19, 2025

EPSS Score Increased

Daily EPSS score increased by 0.805 on 2023-12-30

Nov 22, 2025

EPSS Score Decreased

Daily EPSS score decreased by 0.805 on 2023-12-30

Threat Actor Attribution

PREMIUM INTEL

Associated Groups:Lazarus Group, APT28

Ransomware Campaigns:LockBit 3.0, BlackCat

IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

Affected Products

3 Total

microsoft/exchange_server2013

microsoft/exchange_server2016

microsoft/exchange_server2019

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196Microsoft

PatchVendor Advisory

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196Microsoft

PatchVendor Advisory

Am I Vulnerable?

Check your domain or package.json for CVE-2021-31196 exposure.

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Vulnerability Details

CVSS Base Score

7.2/ 10

Vector

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

Published Date

Jul 14, 2021

Last Modified

Mar 7, 2025

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