CVE-2021-31196

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2024-08-21. Federal remediation due 2024-09-11.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

54.05% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 98.9% of scored records. A rank, not a probability.

NVD base score

7.2 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-08-10.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-07-14 17:53Z5 YR AGO

Last updated

2026-08-10 15:10Z2 MO AGO

Reserved

2021-04-14

Assigning CNA

microsoft

Record state

PUBLISHED

Severity

High (CVSS 7.2)

CNA CVSS vector

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

Weaknesses

No CWE assigned

Data version

5.2

Document digest

8ac0b865172273b202622ad9c6e9f053585287dfae82fe01ebb028464b4914b6

• msrc.microsoft.comMicrosoft Exchange Server Remote Code Execution Vulnerabilityhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31196vendor-advisorypatch
• portal.msrc.microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196x_refsource_MISC
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31196government-resource