CVE-2019-20477 is a critical deserialization vulnerability in PyYAML versions 5.1 through 5.1.2, affecting products like Fedora and PyYAML itself. This flaw, an incomplete fix for a previous CVE, allows for arbitrary code execution due to insufficient restrictions on the load and load_all functions. With a CVSS score of 9.8, it presents a critical risk, allowing unauthenticated attackers to achieve full compromise (confidentiality, integrity, and availability) with low attack complexity over the network. Despite its severity, 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 |
|---|---|---|---|
>= 5.1, <= 5.1.2CPE matchmatch criteria | cpe:2.3:a:pyyaml:pyyaml:*:*:*:*:*:*:*:* | ||
30CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* | ||
31CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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.
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.