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CVE-2021-23422

24
FAUCET Score

CVE-2021-23422 is a critical arbitrary OS command execution vulnerability affecting the bikeshed package prior to version 3.0.0. This flaw allows an attacker to execute arbitrary operating system commands by processing an untrusted source file containing Inline Tag Command metadata, with the command output embedded in the HTML output. Rated 7.8 HIGH, it requires user interaction and local access, but can lead to high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.0.0CPE matchmatch criteria
cpe:2.3:a:bikeshed_project:bikeshed:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.79%
Probability of exploitation in next 30 days
EPSS Percentile
52.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0079 is in the 49th percentile among its peer group of 11,621 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 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 (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: bikeshedFixed in: 3.0.0

Vendor Advisories (1)

pipGHSA-87cj-px37-rc3xhigh

OS Command Injection in bikeshed

Aug 30, 2021

References

github.com / tabatkins/bikeshed/commit/b2f668fca204260b1cad28d5078e93471cb6b2dd
PatchThird Party Advisory
snyk.io / vuln/SNYK-PYTHON-BIKESHED-1537646
PatchThird Party Advisory