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CVE-2021-21269

21
FAUCET Score

CVE-2021-21269 is a path traversal vulnerability affecting Keymaker, a Mastodon Community Finder based Matrix Community serverlist page server, in versions prior to 0.2.0. The flaw allows an authenticated attacker to read arbitrary files on the server due to insufficient input validation in the assets endpoint. This vulnerability carries a CVSS score of 6.5 (Medium) with high confidentiality impact, requiring low privileges and network access. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.2.0CPE matchmatch criteria
cpe:2.3:a:keymaker_project:keymaker:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.7HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.1
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.39%
Probability of exploitation in next 30 days
EPSS Percentile
69.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0139 is in the 83rd percentile among its peer group of 21,958 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 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 / keymaker-mx/keymaker/commit/63f3012b390ff1519a84100df9e5dff5058bb926
PatchThird Party Advisory
github.com / keymaker-mx/keymaker/security/advisories/GHSA-pg25-xfcf-vjvm
Third Party Advisory