CVE-2020-4320 Auth bypass in MQ
Attackers can bypass client authentication restrictions in IBM MQ by exploiting improper SSLPEER certificate validation, allowing unauthorized access.
- 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-2020-4320?
CVE-2020-4320 is a medium-severity authentication bypass vulnerability in Ibm Mq, published on 16 Jun 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
IBM MQ Appliance and IBM MQ AMQP Channels 8.0, 9.0 LTS, 9.1 LTS, and 9.1 CD do not correctly block or allow clients based on the certificate distinguished name SSLPEER setting. IBM X-Force ID: 177403.
Weakness: CWE-295
Which versions are affected by CVE-2020-4320?
It affects 1 product.
Products include Ibm Mq.
How do I fix CVE-2020-4320?
No fix has been published for CVE-2020-4320 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2020-4320 being exploited?
There is no known exploitation of CVE-2020-4320 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-h8p9-p3q3-7x89.