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CVE-2021-41110

30
FAUCET Score

CVE-2021-41110 is a critical deserialization of untrusted data vulnerability affecting cwlviewer versions prior to 1.3.1. This flaw allows an unauthenticated attacker to execute arbitrary code remotely with low attack complexity, resulting in complete compromise of confidentiality, integrity, and availability. While no public exploit code or active exploitation has been observed, the high severity necessitates immediate patching to mitigate the risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.3.1CPE matchmatch criteria
cpe:2.3:a:commonwl:cwlviewer:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.81%
Probability of exploitation in next 30 days
EPSS Percentile
85.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0281 is in the 76th percentile among its peer group of 36,862 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

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / common-workflow-language/cwlviewer/commit/f6066f09edb70033a2ce80200e9fa9e70a5c29de
PatchThird Party Advisory
github.com / common-workflow-language/cwlviewer/security/advisories/GHSA-7g7j-f5g3-fqp7
PatchThird Party Advisory
fatalerrors.org / a/analysis-of-the-snakeyaml-deserialization-in-java-security.html
ExploitThird Party Advisory