CVE-2019-4378 Denial of service in MQ
An authenticated user can cause a denial of service in IBM MQ command server by sending specially crafted PCF messages.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-4378?
CVE-2019-4378 is a medium-severity denial of service vulnerability in Ibm Mq, published on 26 Sep 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
IBM MQ 7.5.0.0 - 7.5.0.9, 7.1.0.0 - 7.1.0.9, 8.0.0.0 - 8.0.0.12, 9.0.0.0 - 9.0.0.6, 9.1.0.0 - 9.1.0.2, and 9.1.0 - 9.1.2 command server is vulnerable to a denial of service attack caused by an authenticated and authorized user using specially crafted PCF messages. IBM X-Force ID: 162084.
Which versions are affected by CVE-2019-4378?
It affects 1 product.
Products include Ibm Mq.
How do I fix CVE-2019-4378?
No fix has been published for CVE-2019-4378 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-4378 being exploited?
There is no known exploitation of CVE-2019-4378 in the wild and no public exploit code.
Other vulnerabilities in Ibm Mq
- CVE-2026-10575 IBM MQ queue manager is vulnerable to remote code execution
- CVE-2026-11375 IBM MQ queue manager is vulnerable to remote code execution
- CVE-2026-11378 IBM MQ queue manager is vulnerable to remote code execution
- CVE-2022-22489 XML external entity in MQ
- CVE-2026-10027 IBM MQ queue manager is vulnerable to unauthenticated remote code execution
Sources
Also known as GHSA-mvwv-xww2-xj42.