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CVE-2021-31196

Microsoft Exchange Server Remote Code Execution Vulnerability

HIGH
7.2
CVSS Score
Published: July 14, 2021 at 05:53 PM UTC
Updated: August 10, 2026 at 08:08 PM UTC
1 product affected across 1 vendorExchange Server

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Severity
HIGH7.2
Exploitation
CISA KEV
Exploit prediction
EPSS 54%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score54.1%

EPSS (Exploit Prediction Scoring System) estimates a 54.1% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Microsoft Exchange Server contains an information disclosure vulnerability that allows for remote code execution.

Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Ransomware Use
Unknown
Added to KEV
Aug 21, 2024
Remediation Due
Sep 11, 2024
779 days overdue
Notes
https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-31196
https://nvd.nist.gov/vuln/detail/CVE-2021-31196

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Exchange Server· Microsoft
95%
15.00.0 ≤ v < 15.00.1497.02315.01.0 ≤ v < 15.01.2242.01215.01.0 ≤ v < 15.01.2308.01415.02.0 ≤ v < 15.02.0858.01515.02.0 ≤ v < 15.02.0922.01315.00.015.01.015.02.02013 cumulative_update_232016 cumulative_update_202016 cumulative_update_212019 cumulative_update_102019 cumulative_update_9
Affected range stops below 15.00.1497.023, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.01.2242.012, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.01.2308.014, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.02.0858.015, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.02.0922.013, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

PatchVendor Advisory
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31196
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31196

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.2HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

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