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CVE-2021-28966

56
FAUCET Score

CVE-2021-28966 describes a path traversal vulnerability in Ruby through version 3.0 on Windows, affecting applications that handle parameters with TmpDir. This high-severity vulnerability (CVSS 7.5) allows an unauthenticated remote attacker to achieve arbitrary file creation or modification by submitting a crafted path. While the potential impact is high, there is currently no known active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.7.3CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
>= 3.0.0, < 3.0.1CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
57.13%
Probability of exploitation in next 30 days
EPSS Percentile
99.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.5713 is in the 98th percentile among its peer group of 51,551 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 (1)

rubygemspatch availablevia ghsa
Product: tmpdirFixed in: 0.1.2

Vendor Advisories (1)

rubygemsGHSA-46f2-3v63-3xrphigh

Tempfile on Windows path traversal vulnerability

May 6, 2021

References

hackerone.com / reports/1131465
ExploitIssue TrackingPatchThird Party Advisory
security.netapp.com / advisory/ntap-20210902-0004
Third Party Advisory