CVE-2022-28380: The rc-httpd component through 2022-03-31 for 9front (Plan 9 fork) allows ..%2f directory traversal if serve-s

Q: How do I fix CVE-2022-28380?

rc-httpd: upgrade to newer than 2022-03-31. Exact commands for each OS are on this page.

Q: Is CVE-2022-28380 being exploited?

CVE-2022-28380 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-28380 affect?

CVE-2022-28380 affects rc-httpd. Severity is high (CVSS 7.5). The rc-httpd component through 2022-03-31 for 9front (Plan 9 fork) allows ..%2f directory traversal if serve-static is used.

Q: How urgent is CVE-2022-28380?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2022-28380 is a high-severity flaw (CVSS 7.5) affecting rc-httpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The rc-httpd component through 2022-03-31 for 9front (Plan 9 fork) allows ..%2f directory traversal if serve-static is used.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-22
Published	2022-04-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: rc-httpd project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-04-03 18:15 UTCPublished CVE record published
2026-06-17 04:38 UTCUpdated Record last modified

rc-httpd project rc-httpd UPGRADE

Affected: <= 2022-03-31

Fixed in: newer than 2022-03-31

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy rc-httpd || rpm -q rc-httpd || rc-httpd --version

2. UPGRADE to newer than 2022-03-31 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rc-httpd

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rc-httpd

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-28380?

rc-httpd: upgrade to newer than 2022-03-31. Exact commands for each OS are on this page.

Is CVE-2022-28380 being exploited?

CVE-2022-28380 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-28380 affect?

CVE-2022-28380 affects rc-httpd. Severity is high (CVSS 7.5). The rc-httpd component through 2022-03-31 for 9front (Plan 9 fork) allows ..%2f directory traversal if serve-static is used.

How urgent is CVE-2022-28380?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

Software pages

Apache HTTP Server vulnerabilities

References

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