CVE-2021-28543

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

1.49% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 72.4% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Low. 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

2021-03-16 14:43Z5 YR AGO

Last updated

2024-08-03 21:47Z2 YR AGO

Reserved

2021-03-16

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 4.0)

CNA CVSS vector

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

Weaknesses

• CWE-476NULL Pointer DereferenceBase
• CWE-617Reachable AssertionBase

Data version

5.1

Document digest

cdfa2774e250a57c715b870d808e15b8b4e57079b4c88e762ad03178441b67fa

• varnish-cache.orghttps://varnish-cache.org/security/VSV00006.htmlx_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-2ad352ec70https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPFBRQUJNWHCB3GQHSSAPRLQU6Q6PY43/vendor-advisoryx_refsource_FEDORA