CVE-2021-39185 is a critical vulnerability affecting Http4s, a Scala HTTP services interface, specifically versions 0.21.26 and prior, 0.22.0-0.22.2, 0.23.0-0.23.1, and 1.0.0-M1-1.0.0-M24. The vulnerability stems from a misconfigured default Cross-Origin Resource Sharing (CORS) setup, making it susceptible to origin reflection and Null Origin attacks. With a CVSS score of 9.1 (CRITICAL), this network-exploitable flaw requires no user interaction or privileges, allowing for high confidentiality and integrity impacts. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 0.21.26CPE matchmatch criteria | cpe:2.3:a:typelevel:http4s:*:*:*:*:*:*:*:* | ||
>= 0.22.0, <= 0.22.2CPE matchmatch criteria | cpe:2.3:a:typelevel:http4s:*:*:*:*:*:*:*:* | ||
0.23.0CPE matchmatch criteria | cpe:2.3:a:typelevel:http4s:0.23.0:*:*:*:*:*:*:* | ||
0.23.1CPE matchmatch criteria | cpe:2.3:a:typelevel:http4s:0.23.1:*:*:*:*:*:*:* | ||
1.0.0CPE matchmatch criteria | cpe:2.3:a:typelevel:http4s:1.0.0:milestone1:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.