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CVE-2025-43866

21
FAUCET Score

CVE-2025-43866 affects vantage6, an open-source infrastructure for privacy-preserving analysis. The vulnerability stems from the use of predictable UUID1s as auto-generated JWT secret keys, which are not cryptographically secure. This high-severity vulnerability (CVSS 7.5) could allow an unauthenticated attacker to compromise confidentiality due to the predictable key, with low attack complexity and no user interaction required. While no active exploitation, public exploit code, or significant community discussion has been observed, organizations using vantage6 should upgrade to version 4.11.0 or later to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.11.0CPE matchmatch criteria
cpe:2.3:a:vantage6:vantage6:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

1.7LOW

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
LOW
VS Integrity
LOW
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
UNREPORTED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.33%
Probability of exploitation in next 30 days
EPSS Percentile
25.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0033 is in the 7th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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 (2)

pippatch availablevia ghsa
Product: vantage6-serverFixed in: 4.11.0
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

pipGHSA-m3mq-f375-5vghlow

Vantage6 Server JWT secret not cryptographically secure

Jun 12, 2025

References

github.com / vantage6/vantage6/security/advisories/GHSA-m3mq-f375-5vgh
Vendor Advisory