CVE-2019-4656Network attack vector

Authenticated queue crash via crafted message

Published Mar 16, 2020 · Updated Sep 17, 2024

A denial-of-service flaw in IBM MQ allows remote authenticated users to crash a queue manager by sending a malicious message. Error-message processing incorrectly marks the affected queue as damaged when it handles the crafted message. An authenticated messaging user can trigger the condition remotely, causing service interruption until the queue manager is restarted.

CVSS severity6.5
Medium
EPSS probability1.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A denial-of-service flaw in IBM MQ allows remote authenticated users to crash a queue manager by sending a malicious message. Error-message processing incorrectly marks the affected queue as damaged when it handles the crafted message. An authenticated messaging user can trigger the condition remotely, causing service interruption until the queue manager is restarted.

The record

CVE
CVE-2019-4656
Published
Mar 16, 2020
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM MQ
Classifications
T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 16, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=7.1.0.0
  2. Affected versionversion=7.1.0.1
  3. Affected versionversion=7.1.0.2
  4. Affected versionversion=7.1.0.3
  5. Affected versionversion=7.1.0.4
  6. Affected versionversion=7.1.0.5
  7. Affected versionversion=7.1.0.6
  8. Affected versionversion=7.1.0.7
  9. Affected versionversion=7.1.0.8
  10. Affected versionversion=7.1.0.9
  11. Affected versionversion=7.5.0.0
  12. Affected versionversion=7.5.0.1
  13. Affected versionversion=7.5.0.2
  14. Affected versionversion=7.5.0.3
  15. Affected versionversion=7.5.0.4
  16. Affected versionversion=7.5.0.5
  17. Affected versionversion=7.5.0.6
  18. Affected versionversion=7.5.0.7
  19. Affected versionversion=7.5.0.8
  20. Affected versionversion=7.5.0.9
  21. Affected versionversion=8.0.0.0
  22. Affected versionversion=8.0.0.1
  23. Affected versionversion=8.0.0.10
  24. Affected versionversion=8.0.0.11
  25. Affected versionversion=8.0.0.12
  26. Affected versionversion=8.0.0.13
  27. Affected versionversion=8.0.0.2
  28. Affected versionversion=8.0.0.3
  29. Affected versionversion=8.0.0.4
  30. Affected versionversion=8.0.0.5
  31. Affected versionversion=8.0.0.6
  32. Affected versionversion=8.0.0.7
  33. Affected versionversion=8.0.0.8
  34. Affected versionversion=8.0.0.9
  35. Affected versionversion=9.0.0.0
  36. Affected versionversion=9.0.0.1
  37. Affected versionversion=9.0.0.2
  38. Affected versionversion=9.0.0.3
  39. Affected versionversion=9.0.0.4
  40. Affected versionversion=9.0.0.5
  41. Affected versionversion=9.0.0.6
  42. Affected versionversion=9.0.0.7
  43. Affected versionversion=9.0.0.8
  44. Affected versionversion=9.1
  45. Affected versionversion=9.1.0.1
  46. Affected versionversion=9.1.0.2
  47. Affected versionversion=9.1.0.3
  48. Affected versionversion=9.1.1
  49. Affected versionversion=9.1.2
  50. Affected versionversion=9.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM MQversion=7.1.0.0; version=7.1.0.1; version=7.1.0.2; version=7.1.0.3; version=7.1.0.4; version=7.1.0.5; version=7.1.0.6; version=7.1.0.7; version=7.1.0.8; version=7.1.0.9; version=7.5.0.0; version=7.5.0.1; version=7.5.0.2; version=7.5.0.3; version=7.5.0.4; version=7.5.0.5; version=7.5.0.6; version=7.5.0.7; version=7.5.0.8; version=7.5.0.9; version=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=8.0.0.2; 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=8.0.0.8; version=8.0.0.9; version=9.0.0.0; version=9.0.0.1; version=9.0.0.2; version=9.0.0.3; version=9.0.0.4; version=9.0.0.5; version=9.0.0.6; version=9.0.0.7; version=9.0.0.8; 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

6.5IBMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0NVDAV:N/AC:L/Au:S/C:N/I:N/A:P

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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