How severe is CVE-2025-1991?

CVE-2025-1991 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-1991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-1991?

CVE-2025-1991 primarily affects Ibm Informix Dynamic Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-1991?

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

Does CVE-2025-1991 have an EU (EUVD) identifier?

Yes. CVE-2025-1991 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19451.

When was CVE-2025-1991 published?

CVE-2025-1991 was published on 2025-06-28 and last updated on 2026-06-17.

CVE-2025-1991

CVE-2025-1991 is a high-severity vulnerability in Ibm Informix Dynamic Server with a CVSS 3.x base score of 7.5. 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-191.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-19451
Weakness: CWE-191
Affected product: Ibm Informix Dynamic Server
Published: 2025-06-28
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-1991?: 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.
How severe is CVE-2025-1991?: CVE-2025-1991 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-1991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-1991?: CVE-2025-1991 primarily affects Ibm Informix Dynamic Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-1991?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-1991 have an EU (EUVD) identifier?: Yes. CVE-2025-1991 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19451.
When was CVE-2025-1991 published?: CVE-2025-1991 was published on 2025-06-28 and last updated on 2026-06-17.

References

https://www.ibm.com/support/pages/node/7238455

Affected products (3)

cpe:2.3:a:ibm:informix_dynamic_server:12.10:-:*:*:-:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:14.10:-:*:*:-:*:*:*
cpe:2.3:a:ibm:informix_dynamic_server:15.0:-:*:*:-:*:*:*

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