CVE-2025-1991 IBM Informix Dynamic Server denial of service

What is CVE-2025-1991?

CVE-2025-1991 is a high-severity vulnerability in Ibm Informix Dynamic Server, published on 28 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

IBM Informix Dynamic Server 12.10,14.10, and15.0 could allow a remote attacker to cause a denial of service due to an integer underflow when processing packets.

Weakness: CWE-191

Which versions are affected by CVE-2025-1991?

It affects 1 product.

Products include Ibm Informix Dynamic Server.

How do I fix CVE-2025-1991?

No fix has been published for CVE-2025-1991 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-1991 being exploited?

There is no known exploitation of CVE-2025-1991 in the wild and no public exploit code.

Other vulnerabilities in Ibm Informix Dynamic Server

• CVE-2010-4070 Integer overflow in n/a Critical 10.0
• CVE-2009-2753 Memory corruption in n/a Critical 10.0
• CVE-2008-0949 Privilege escalation in n/a Critical 10.0
• CVE-2008-0768 Memory corruption in n/a Critical 10.0
• CVE-2011-1033 Memory corruption in n/a Critical 9.3

All Ibm Informix Dynamic Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-h658-g68v-wgc7.