CVE-2021-31999 is a critical vulnerability in Rancher versions prior to 2.5.9 and 2.4.16, stemming from a reliance on untrusted inputs in security decisions. This allows authenticated users to impersonate other users or groups within the cluster by forging "Impersonate-User" or "Impersonate-Group" headers. With a CVSS score of 8.8 (High), it presents a significant risk due to its low attack complexity and potential for complete compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 2.4.16CPE matchmatch criteria | cpe:2.3:a:rancher:rancher:*:*:*:*:*:*:*:* | ||
>= 2.5.0, < 2.5.9CPE matchmatch criteria | cpe:2.3:a:rancher:rancher:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.