CVE-2021-28321

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.28% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 69.6% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

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

2021-04-13 19:32Z5 YR AGO

Last updated

2024-08-03 21:40Z2 YR AGO

Reserved

2021-03-12

Assigning CNA

microsoft

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

• CWE-59Improper Link Resolution Before File Access ('Link Following')Base

Data version

5.1

Document digest

fec6a9f32f0ac0ba28f13b07c2f9cf83129174af9e3820d6061ae1214ae52434

• portal.msrc.microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28321x_refsource_MISC
• seclists.org20210419 CVE-2021-28321-CVE-2021-28323: elevation of privileges in Microsoft Diaghubhttp://seclists.org/fulldisclosure/2021/Apr/40mailing-listx_refsource_FULLDISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/162251/Microsoft-DiagHub-Privilege-Escalation.htmlx_refsource_MISC