CVE-2021-20584Network attack vector

Authenticated arbitrary file upload via improper access control

Published Oct 7, 2021 · Updated Sep 17, 2024

Improper access control in affected IBM Sterling File Gateway releases allows remote authenticated users to upload arbitrary files. IBM identifies the myFileGateway user interface as the affected component but has not disclosed which authorization check is missing or bypassed. A valid low-privilege account is required; affected ranges end at 5.2.6.5_4, 6.0.0.6, 6.0.3.4, and 6.1.0.2.

CVSS severity6.5
Medium
EPSS probability1.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in affected IBM Sterling File Gateway releases allows remote authenticated users to upload arbitrary files. IBM identifies the myFileGateway user interface as the affected component but has not disclosed which authorization check is missing or bypassed. A valid low-privilege account is required; affected ranges end at 5.2.6.5_4, 6.0.0.6, 6.0.3.4, and 6.1.0.2.

The record

CVE
CVE-2021-20584
Published
Oct 7, 2021
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM Sterling File Gateway
Classifications
T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record 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=2.2.0.0
  2. Affected versionversion=5.2.6.5_4
  3. Affected versionversion=6.0.0.0
  4. Affected versionversion=6.0.0.6
  5. Affected versionversion=6.0.1.0
  6. Affected versionversion=6.0.3.4
  7. Affected versionversion=6.1.0.0
  8. Affected versionversion=6.1.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Sterling File Gatewayversion=2.2.0.0; version=5.2.6.5_4; version=6.0.0.0; version=6.0.0.6; version=6.0.1.0; version=6.0.3.4; version=6.1.0.0; version=6.1.0.2

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
6.5IBM CorporationCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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