CVE-2021-28691

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

0.36% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 29.1% 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

Analyzed. NVD last modified this record on 2026-08-26.

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

2021-06-29 11:30Z5 YR AGO

Last updated

2024-08-03 21:47Z2 YR AGO

Reserved

2021-03-18

Assigning CNA

XEN

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.1

Document digest

adef5c22d45aaf8512ad50f5967867a8ab374667c3d1c02a1baafdfdeca93e0e

• xenbits.xenproject.orghttps://xenbits.xenproject.org/xsa/advisory-374.txtx_refsource_MISC
• security.gentoo.orgGLSA-202107-30https://security.gentoo.org/glsa/202107-30vendor-advisoryx_refsource_GENTOO
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210805-0002/x_refsource_CONFIRM