CVE-2021-28683

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

1.69% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 75.0% 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

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

2021-05-20 16:34Z5 YR AGO

Last updated

2024-08-03 21:47Z2 YR AGO

Reserved

2021-03-18

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-476NULL Pointer DereferenceBase

Data version

5.1

Document digest

eb4672d0a5c35c99795489bafe4cc1112a494ae7df00c6dbaf09182f02fd048c

• github.comhttps://github.com/envoyproxy/envoy/releasesx_refsource_MISC
• blog.envoyproxy.iohttps://blog.envoyproxy.iox_refsource_MISC
• github.comhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-r22g-5f3x-xjggx_refsource_MISC