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CVE-2022-28380

19
FAUCET Score

CVE-2022-28380 is a directory traversal vulnerability affecting the rc-httpd component in 9front (a Plan 9 fork) when the serve-static feature is enabled. This allows an unauthenticated attacker to access arbitrary files on the server using specially crafted URLs containing "..%2f". Rated as High severity (CVSS 7.5), it requires no user interaction or complex attack conditions, potentially leading to full disclosure of sensitive information. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there is minimal community discussion or media coverage, its ease of exploitation warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2022-03-31CPE matchmatch criteria
cpe:2.3:a:rc-httpd_project:rc-httpd:*:*:*:*:*:9front:*:*

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:H/I:N/A:N

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

Exploit Intelligence

EPSS Score
1.47%
Probability of exploitation in next 30 days
EPSS Percentile
71.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0147 is in the 52nd percentile among its peer group of 51,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Remediation records are not available for this CVE.

References

desuarchive.org / g/thread/86286230
Issue TrackingThird Party Advisory
git.9front.org / plan9front/plan9front/241667b933ff5bacb9a3974f6877fb8aad78bed3/commit.html
PatchThird Party Advisory