7.2

CVE-2021-31196: Microsoft Exchange Server Information Disclosure Vulnerability

CVSS: 7.2v3.1HighKEVAnalyzed
Published 14-07-2021Last modified 10-08-2026
Open JSON

Vulnerability summary

CVE-2021-31196 is a high (CVSS 7.2) vulnerability in Microsoft Exchange Server. It is known to be exploited: CISA lists it, first on 21-08-2024. EPSS estimates a 54.06% chance of exploitation in the next 30 days, higher than 98.9% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
7.2/10
010
High · v3.1 (CVE.org)
EPSS score
54.06%
0%100%
Critical · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-07-2021
    PublishedVulnerability first disclosed.
  2. 21-08-2024
    Added to CISA KEVMicrosoft Exchange Server Information Disclosure Vulnerability
  3. 11-09-2024
    CISA remediation dueApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  4. 10-08-2026
    Last modifiedVulnerability information updated.

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

54.06%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

0.00 pp

From 54.06% on 19-09-2026

19-09-202619-10-2026
EPSS score
54.06%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
21-08-2024
Federal due date
11-09-2024

CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. msrc.microsoft.com/update-guide/en-US/advisory/CVE-2021-31196 nvd.nist.gov/vuln/detail/CVE-2021-31196

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft6 products

1 vendor · 6 products

References

3 links