How severe is CVE-2023-28523?

CVE-2023-28523 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-28523 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-28523?

CVE-2023-28523 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-2023-28523?

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.

When was CVE-2023-28523 published?

CVE-2023-28523 was published on 2023-12-09 and last updated on 2026-06-17.

CVE-2023-28523

CVE-2023-28523 is a high-severity vulnerability in Ibm Informix Dynamic Server with a CVSS 3.x base score of 8.4. 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-787.

Key facts

Severity: High (CVSS 3.x base score 8.4)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Ibm Informix Dynamic Server
Published: 2023-12-09
Last modified: 2026-06-17

Description

IBM Informix Dynamic Server 12.10 and 14.10 onsmsync is vulnerable to a heap buffer overflow, caused by improper bounds checking which could allow an attacker to execute arbitrary code. IBM X-Force ID: 250753.

Frequently asked questions

What is CVE-2023-28523?: IBM Informix Dynamic Server 12.10 and 14.10 onsmsync is vulnerable to a heap buffer overflow, caused by improper bounds checking which could allow an attacker to execute arbitrary code. IBM X-Force ID: 250753.
How severe is CVE-2023-28523?: CVE-2023-28523 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-28523 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-28523?: CVE-2023-28523 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-2023-28523?: 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.
When was CVE-2023-28523 published?: CVE-2023-28523 was published on 2023-12-09 and last updated on 2026-06-17.

References

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_on_cloud_pak_for_data:*:*:*:*:*:*:*:*

More vulnerabilities in Ibm Informix Dynamic Server

CVE-2010-4070 — Critical (CVSS 10.0): Integer overflow in librpc.dll in portmap.exe (aka the ISM Portmapper service) in ISM before 2.20.TC1.117 in IBM…
CVE-2009-2754 — Critical (CVSS 10.0): Integer signedness error in the authentication functionality in librpc.dll in the Informix Storage Manager (ISM)…
CVE-2009-2753 — Critical (CVSS 10.0): Multiple buffer overflows in the authentication functionality in librpc.dll in the Informix Storage Manager (ISM)…
CVE-2008-0949 — Critical (CVSS 10.0): Unspecified vulnerability in IBM Informix Dynamic Server (IDS) 7.x through 11.x allows remote attackers to gain…
CVE-2008-0768 — Critical (CVSS 10.0): Multiple stack-based and heap-based buffer overflows in the Windows RPC components for IBM Informix Storage Manager…
CVE-2011-1033 — Critical (CVSS 9.3): Stack-based buffer overflow in oninit in IBM Informix Dynamic Server (IDS) 11.50 allows remote attackers to execute…

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