CVE-2021-21335 describes a critical authentication bypass vulnerability in the SPNEGO HTTP Authentication Module for nginx (spnego-http-auth-nginx-module) prior to version 1.1.1. An attacker can exploit this flaw by using a malformed username to bypass basic authentication, impacting users who have enabled this feature. With a CVSS score of 9.8 (CRITICAL), this vulnerability is easily exploitable over the network with no user interaction, leading to potential full compromise of confidentiality, integrity, and availability. While no active exploitation, public exploit code, or significant community discussion has been observed, immediate patching to version 1.1.1 or disabling basic authentication is recommended.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.1.1CPE matchmatch criteria | cpe:2.3:a:spnego_http_authentication_module_project:spnego_http_authentication_module:*:*:*:*:*:nginx:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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.