How severe is CVE-2009-3691?

CVE-2009-3691 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2009-3691 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3691?

CVE-2009-3691 primarily affects Ibm Informix Client Sdk. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3691?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-3691 published?

CVE-2009-3691 was published on 2009-10-13 and last updated on 2026-06-16.

CVE-2009-3691

CVE-2009-3691 is a critical-severity vulnerability in Ibm Informix Client Sdk with a CVSS 2.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-189.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Ibm Informix Client Sdk
Published: 2009-10-13
Last modified: 2026-06-16

Description

Multiple integer overflows in setnet32.exe 3.50.0.13752 in IBM Informix Client SDK 3.0 and 3.50 and Informix Connect Runtime 3.x allow remote attackers to execute arbitrary code via a .nfx file with a crafted (1) HostSize, and possibly (2) ProtoSize and (3) ServerSize, field that triggers a stack-based buffer overflow involving a crafted HostList field. NOTE: some of these details are obtained from third party information.

Frequently asked questions

What is CVE-2009-3691?: Multiple integer overflows in setnet32.exe 3.50.0.13752 in IBM Informix Client SDK 3.0 and 3.50 and Informix Connect Runtime 3.x allow remote attackers to execute arbitrary code via a .nfx file with a crafted (1) HostSize, and possibly (2) ProtoSize and (3) ServerSize, field that triggers a stack-based buffer overflow involving a crafted HostList field. NOTE: some of these details are obtained from third party information.
How severe is CVE-2009-3691?: CVE-2009-3691 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2009-3691 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3691?: CVE-2009-3691 primarily affects Ibm Informix Client Sdk. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3691?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-3691 published?: CVE-2009-3691 was published on 2009-10-13 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:ibm:informix_client_sdk:3.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:informix_client_sdk:3.50:*:*:*:*:*:*:*
cpe:2.3:a:ibm:informix_connect_runtime:3.0:*:*:*:*:*:*:*

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