How severe is CVE-2019-4656?

CVE-2019-4656 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-4656 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-4656?

CVE-2019-4656 primarily affects Ibm Mq. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-4656?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-4656 published?

CVE-2019-4656 was published on 2020-03-16 and last updated on 2026-06-17.

CVE-2019-4656

CVE-2019-4656 is a medium-severity vulnerability in Ibm Mq with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Ibm Mq
Published: 2020-03-16
Last modified: 2026-06-17

Description

IBM MQ and IBM MQ Appliance 7.1, 7.5, 8.0, 9.0 LTS, 9.1 LTS, and 9.1 CD is vulnerable to a denial of service attack that would allow an authenticated user to crash the queue and require a restart due to an error processing error messages. IBM X-Force ID: 170967.

Frequently asked questions

What is CVE-2019-4656?: IBM MQ and IBM MQ Appliance 7.1, 7.5, 8.0, 9.0 LTS, 9.1 LTS, and 9.1 CD is vulnerable to a denial of service attack that would allow an authenticated user to crash the queue and require a restart due to an error processing error messages. IBM X-Force ID: 170967.
How severe is CVE-2019-4656?: CVE-2019-4656 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-4656 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-4656?: CVE-2019-4656 primarily affects Ibm Mq. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-4656?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-4656 published?: CVE-2019-4656 was published on 2020-03-16 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:ibm:mq:*:*:*:*:*:*:*:*
cpe:2.3:a:ibm:mq:*:*:*:*:lts:*:*:*
cpe:2.3:a:ibm:mq:*:*:*:*:continuous_delivery:*:*:*
cpe:2.3:a:ibm:mq_appliance:*:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_mq:*:*:*:*:*:*:*:*

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