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CVE-2021-4304

31
FAUCET Score

CVE-2021-4304 is a critical command injection vulnerability affecting the ulcc-core project's ulcc-core software. Specifically, it allows for remote command injection through the manipulation of the 'password' argument in the cgi/toolbox/toolbox file. With a CVSS score of 9.8 (CRITICAL), this vulnerability poses a severe risk, enabling unauthenticated attackers to achieve full compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, nor are there publicly available exploit modules or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2021-02-05CPE matchmatch criteria
cpe:2.3:a:ulcc-core_project:ulcc-core:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.15%
Probability of exploitation in next 30 days
EPSS Percentile
80.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0215 is in the 69th percentile among its peer group of 36,835 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 / eprintsug/ulcc-core/commit/811edaae81eb044891594f00062a828f51b22cb1
Patch
vuldb.com
Permissions RequiredThird Party Advisory
vuldb.com
Permissions RequiredThird Party Advisory