CVE-2021-41556 is a critical out-of-bounds read vulnerability in Squirrel versions 2.2.5 and 3.x through 3.1, affecting products like Fedora and Squirrel-lang. This flaw allows an unauthenticated attacker to achieve remote code execution by tricking a victim into executing a specially crafted Squirrel script, even within sandboxed environments. With a CVSS score of 10.0 (Critical), it presents a severe risk of complete compromise (Confidentiality, Integrity, Availability) with low attack complexity. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered some community discussion and media coverage, indicating awareness within the cybersecurity community.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 2.2.5CPE matchmatch criteria | cpe:2.3:a:squirrel-lang:squirrel:*:*:*:*:*:*:*:* | ||
>= 3.0, <= 3.1CPE matchmatch criteria | cpe:2.3:a:squirrel-lang:squirrel:*:*:*:*:*:*:*:* | ||
35CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | ||
36CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.