Is CVE-2021-31196 in the CISA KEV catalog?

Yes. CVE-2021-31196 is on the CISA Known Exploited Vulnerabilities list, added 2024-08-21.

What is the CVSS severity of CVE-2021-31196?

CVE-2021-31196 has a CVSS v3 base score of 7.2 (HIGH).

What is the EPSS score for CVE-2021-31196?

CVE-2021-31196 has an EPSS score of 46.38% (99th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2021-31196

HIGHCISA KEVEPSS 99th pctl

7.2

CVSS v3

NVD

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

46.38%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Exchange Server Information Disclosure Vulnerability

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

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remediation due: 2024-09-11

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-29.