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CVE-2021-44657

27
FAUCET Score

CVE-2021-44657 is a critical vulnerability affecting StackStorm versions prior to 3.6.0, where the Jinja interpreter was not sandboxed, allowing for the execution of arbitrary system commands. This flaw carries a high CVSS score of 8.8, indicating a network-exploitable vulnerability with low attack complexity that can lead to complete compromise of confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.6.0CPE matchmatch criteria
cpe:2.3:a:stackstorm:stackstorm:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.47%
Probability of exploitation in next 30 days
EPSS Percentile
82.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0247 is in the 81st percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 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 / pallets/jinja/issues/549
ExploitIssue TrackingThird Party Advisory
github.com / StackStorm/st2/pull/5359
PatchThird Party Advisory
podalirius.net / en/articles/python-vulnerabilities-code-execution-in-jinja-templates
ExploitThird Party Advisory
stackstorm.com / 2021/12/16/stackstorm-v3-6-0-released
Release NotesVendor Advisory