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CVE-2020-8441

29
FAUCET Score

CVE-2020-8441 is a critical remote code execution vulnerability affecting JYaml through version 1.3, a discontinued product. This flaw, categorized as CWE-502, allows an unauthenticated attacker to execute arbitrary code by sending a specially crafted malicious payload to the load() function during deserialization. With a CVSS score of 9.8, it presents a severe risk due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. Despite its critical severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.3CPE matchmatch criteria
cpe:2.3:a:jyaml_project:jyaml:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.96%
Probability of exploitation in next 30 days
EPSS Percentile
91.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0496 is in the 85th percentile among its peer group of 36,829 CVEs.

Social Chatter

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.

Media 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.

Remediation

Vendor Advisories (1)

mavenGHSA-4qhr-q7wf-94xpcritical

Deserialization of Untrusted Data in JYaml

May 24, 2022

References

gist.github.com / j0lt-github/f5141abcacae63d434ecae211422153a
ExploitThird Party Advisory
github.com / mbechler/marshalsec
Third Party Advisory
github.com / mbechler/marshalsec/blob/master/marshalsec.pdf
Technical DescriptionThird Party Advisory
security.netapp.com / advisory/ntap-20200313-0001
sourceforge.net / p/jyaml/bugs
Third Party Advisory