CVE-2021-21294 is a denial-of-service vulnerability affecting Http4s (http4s-blaze-server) versions prior to 0.21.17, 0.22.0-M2, and 1.0.0-M14. The vulnerability stems from Blaze-core's unbounded acceptance of connections on its selector pool, allowing an attacker to exhaust system resources by holding open numerous connections. This can lead to service degradation and denial-of-service, with a CVSS score of 7.5 (HIGH). There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 0.21.17CPE matchmatch criteria | cpe:2.3:a:typelevel:http4s:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.