CVE-2021-43816 is a critical vulnerability affecting containerd, an open-source container runtime, specifically on SELinux-enabled systems like EL8 and Fedora, when used as a Container Runtime Interface (CRI). An unprivileged pod can achieve full read/write access to privileged host files by binding them to specific container locations (/etc/hosts, /etc/hostname, or /etc/resolv.conf), due to indiscriminate SELinux relabeling. This vulnerability carries a CVSS score of 9.1 (CRITICAL) due to its network attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 1.5.1, < 1.5.9CPE matchmatch criteria | cpe:2.3:a:linuxfoundation:containerd:*:*:*:*:*:*:*:* | ||
1.5.0CPE matchmatch criteria | cpe:2.3:a:linuxfoundation:containerd:1.5.0:-:*:*:*:*:*:* | ||
1.5.0CPE matchmatch criteria | cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta0:*:*:*:*:*:* | ||
1.5.0CPE matchmatch criteria | cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta1:*:*:*:*:*:* | ||
1.5.0CPE matchmatch criteria | cpe:2.3:a:linuxfoundation:containerd:1.5.0:beta2:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.7 Bluesky, 0.4 Mastodon, and 1.7 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.4 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.