CVE-2021-31957

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited 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

5.13% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 92.1% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-07.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

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

2021-06-08 22:46Z5 YR AGO

Last updated

2026-10-07 16:12Z22 DAYS AGO

Reserved

2021-04-30

Assigning CNA

microsoft

Record state

PUBLISHED

Severity

Medium (CVSS 5.9)

CNA CVSS vector

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

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass
• CWE-772Missing Release of Resource after Effective LifetimeBase

Data version

5.2

Document digest

85d53f1ad1f53e6540187177798bb429fdf0dfb1c833e9656ad9fbf8a2453b87

• portal.msrc.microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31957x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-4b3fc547fehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PMHWHRRYDHKM6BIINW5V7OCSW4SDWB4W/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-cb4f3ab817https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4PRVVLXXQEF4SEJOBV3VRJHGX7YHY2CG/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-1e0e04958dhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMAO4NG2OQ4PCXUQWMNSCMYWLIJJY6UY/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-e9c84e6d26https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVCDYIP4A6DDRT7G6P3ZW6PKNK2DNWJ2/vendor-advisoryx_refsource_FEDORA