CVE-2021-39214 describes an HTTP request smuggling vulnerability in mitmproxy versions 7.0.2 and below, allowing malicious clients or servers to bypass security controls. This critical vulnerability, rated 9.8 CVSS, enables attackers to smuggle requests or responses within legitimate HTTP messages, circumventing mitmproxy's event hooks and potentially access controls or input sanitization. While no active exploitation or public exploit code is currently reported, the vulnerability has garnered significant community discussion. Organizations using mitmproxy to protect HTTP/1 services should upgrade to version 7.0.3 or higher immediately.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 7.0.2CPE matchmatch criteria | cpe:2.3:a:mitmproxy:mitmproxy:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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.