CVE-2021-36773

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

1.26% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 69.1% 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

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

2021-07-18 03:34Z5 YR AGO

Last updated

2024-08-04 01:01Z2 YR AGO

Reserved

2021-07-18

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-674Uncontrolled RecursionClass

Data version

5.1

Document digest

f37f76bbe5d18c67435de95a656d4c8204b99687547d419732fc95f05abb54f5

• news.ycombinator.comhttps://news.ycombinator.com/item?id=27833752x_refsource_MISC
• github.comhttps://github.com/vtriolet/writings/blob/main/posts/2021/ublock_origin_and_umatrix_denial_of_service.adocx_refsource_MISC
• lists.debian.org[debian-lts-announce] 20220629 [SECURITY] [DLA 3062-1] ublock-origin security updatehttps://lists.debian.org/debian-lts-announce/2022/06/msg00024.htmlmailing-listx_refsource_MLIST