CVE-2021-39947 affects GitLab Runner versions up to 14.3.4, 14.4 to 14.4.2, and 14.5 to 14.5.2, where trace file buffers could reuse file descriptor 0, leading to mixed output from multiple jobs. This vulnerability has a high severity CVSS score of 7.5, indicating a network-exploitable issue with low attack complexity that could lead to high integrity impact without user interaction. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), it has received some community discussion and media coverage, including a GitLab security advisory.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 14.3.4CPE matchmatch criteria | cpe:2.3:a:gitlab:gitlab_runner:*:*:*:*:*:*:*:* | ||
>= 14.4.0, < 14.4.2CPE matchmatch criteria | cpe:2.3:a:gitlab:gitlab_runner:*:*:*:*:*:*:*:* | ||
>= 14.5.0, < 14.5.2CPE matchmatch criteria | cpe:2.3:a:gitlab:gitlab_runner:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.