CVE-2021-27798Public exploit

Filesystem disclosure via more tab completion

Published Aug 5, 2022 · Updated Feb 15, 2025

Path traversal in Brocade Fabric OS 7.4.1b and 7.3.1d allows local users to disclose filesystem structure through a restricted shell. Tab completion passes partial paths supplied to the more binary outside the account's assigned scope and lists the referenced directories. Access requires a user or factory account and an active SSH session; disclosure is limited to directory contents and available binary names.

CVSS severity3.3
Low
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Brocade Fabric OS 7.4.1b and 7.3.1d allows local users to disclose filesystem structure through a restricted shell. Tab completion passes partial paths supplied to the more binary outside the account's assigned scope and lists the referenced directories. Access requires a user or factory account and an active SSH session; disclosure is limited to directory contents and available binary names.

The record

CVE
CVE-2021-27798
Published
Aug 5, 2022
Updated
Feb 15, 2025
Vendor
Brocade Communications Systems
Product
Brocade Fabric OS
Classifications
CWE-22, T1083
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Feb 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Brocade Fabric OS 7.4.1b, and 7.3.1d.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Brocade Communications Systems · Brocade Fabric OSversion=Brocade Fabric OS 7.4.1b, and 7.3.1d.

Published CVSS scores

3.3BroadcomCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1083File and Directory Discovery

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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