CVE-2021-39056 Denial of service in i
A remote authenticated user can cause a denial of service in IBM i's Extended Dynamic Remote SQL server by sending a specially crafted request.
- 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-2021-39056?
CVE-2021-39056 is a medium-severity denial of service vulnerability in Ibm I, published on 13 Jan 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The IBM i 7.1, 7.2, 7.3, and 7.4 Extended Dynamic Remote SQL server (EDRSQL) could allow a remote authenticated user to send a specially crafted request and cause a denial of service. IBM X-Force ID: 214537.
Which versions are affected by CVE-2021-39056?
It affects 1 product.
Products include Ibm I.
How do I fix CVE-2021-39056?
No fix has been published for CVE-2021-39056 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-2021-39056 being exploited?
There is no known exploitation of CVE-2021-39056 in the wild and no public exploit code.
Other vulnerabilities in Ibm I
- CVE-2026-96119 IBM i is Affected By An Improper Control of Code Generation Vulnerability in HTTP Server Administration GUI
- CVE-2026-16860 IBM i is Affected By Remote Code Execution Vulnerability []
- CVE-2026-17083 IBM i is Affected By Multiple Vulnerabilities in the Debug Server
- CVE-2026-17218 IBM i is Affected By Remote Code Execution Vulnerability in Line Printer Daemon []
- CVE-2026-17276 IBM i is Affected By Multiple Vulnerabilities in Navigator for i
Sources
Also known as GHSA-52w9-4w5g-hqxc.