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

> A remote attacker can cause a denial of service in IBM Informix Dynamic Server via an integer underflow during packet processing.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Jun 2025
- **Updated:** 24 Aug 2025
- **Also known as:** GHSA-h658-g68v-wgc7

## 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 (Integer Underflow (Wrap or Wraparound))

## Which versions are affected by CVE-2025-1991?

It affects 1 product.


Products: 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](https://insights.sbomify.com/CVE-2010-4070/): Integer overflow in n/a (critical 10.0)
- [CVE-2009-2753](https://insights.sbomify.com/CVE-2009-2753/): Memory corruption in n/a (critical 10.0)
- [CVE-2008-0949](https://insights.sbomify.com/CVE-2008-0949/): Privilege escalation in n/a (critical 10.0)
- [CVE-2008-0768](https://insights.sbomify.com/CVE-2008-0768/): Memory corruption in n/a (critical 10.0)
- [CVE-2011-1033](https://insights.sbomify.com/CVE-2011-1033/): Memory corruption in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-1991 and fix it if it is affected.

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

Affected product: Ibm Informix Dynamic Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-1991/ (Markdown: https://insights.sbomify.com/CVE-2025-1991/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-1991
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-1991
- OSV: https://osv.dev/vulnerability/CVE-2025-1991

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-1991/
Summaries are generated and may contain mistakes; the official description above is the record.