CVE-2019-4620

Local security restriction bypass via environment variables

Published Jan 28, 2020 · Updated Sep 17, 2024

Improper input validation in IBM MQ Appliance 8.0 and 9.1 allows local users to bypass security restrictions through environment variables. IBM states that environment variables are improperly validated but does not disclose the affected command, validation rule, or accepted input. Local access is required; IBM does not disclose which restriction is bypassed or the resulting data access, modification, or service effect.

CVSS severity8.4
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in IBM MQ Appliance 8.0 and 9.1 allows local users to bypass security restrictions through environment variables. IBM states that environment variables are improperly validated but does not disclose the affected command, validation rule, or accepted input. Local access is required; IBM does not disclose which restriction is bypassed or the resulting data access, modification, or service effect.

The record

CVE
CVE-2019-4620
Published
Jan 28, 2020
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM MQ Appliance
Classifications
CWE-20, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 28, 2020CVE 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=8.0.0.0
  2. Affected versionversion=8.0.0.1
  3. Affected versionversion=8.0.0.10
  4. Affected versionversion=8.0.0.11
  5. Affected versionversion=8.0.0.12
  6. Affected versionversion=8.0.0.13
  7. Affected versionversion=8.0.0.3
  8. Affected versionversion=8.0.0.4
  9. Affected versionversion=8.0.0.5
  10. Affected versionversion=8.0.0.6
  11. Affected versionversion=8.0.0.7
  12. Affected versionversion=8.0.0.9
  13. Affected versionversion=9.1
  14. Affected versionversion=9.1.0.1
  15. Affected versionversion=9.1.0.2
  16. Affected versionversion=9.1.0.3
  17. Affected versionversion=9.1.1
  18. Affected versionversion=9.1.2
  19. Affected versionversion=9.1.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

IBM · IBM MQ Applianceversion=8.0.0.0; version=8.0.0.1; version=8.0.0.10; version=8.0.0.11; version=8.0.0.12; version=8.0.0.13; version=8.0.0.3; version=8.0.0.4; version=8.0.0.5; version=8.0.0.6; version=8.0.0.7; version=8.0.0.9; version=9.1; version=9.1.0.1; version=9.1.0.2; version=9.1.0.3; version=9.1.1; version=9.1.2; version=9.1.3

Published CVSS scores

8.4IBM CorporationCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

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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