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Informix Dynamic Server CVE-2023-28526

MEDIUM
Heap-based Buffer Overflow (CWE-122)
2023-12-09 psirt@us.ibm.com
Buffer Overflow Heap Overflow IBM Informix Dynamic Server Informix Dynamic Server On Cloud Pak For Data
5.5
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-122
ASVS 5.0
V15 - Secure Coding and Architecture Heap buffer bounds checking
MITRE ATT&CK

1 technique across 1 tactic: Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 5.5 (MEDIUM). Attack characteristics: local attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived

Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAI

IBM Informix Dynamic Server 12.10 and 14.10 archecker is vulnerable to a heap buffer overflow, caused by improper bounds checking which could allow a local user to cause a segmentation fault. Rated medium severity (CVSS 5.5), this vulnerability is low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified under CWE-122. IBM Informix Dynamic Server 12.10 and 14.10 archecker is vulnerable to a heap buffer overflow, caused by improper bounds checking which could allow a local user to cause a segmentation fault. IBM X-Force ID: 251204. Affected products include: Ibm Informix Dynamic Server, Ibm Informix Dynamic Server On Cloud Pak For Data.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

DescriptionNVD

IBM Informix Dynamic Server 12.10 and 14.10 archecker is vulnerable to a heap buffer overflow, caused by improper bounds checking which could allow a local user to cause a segmentation fault. IBM X-Force ID: 251204.

Threat Intelligence Overview

EPSS Score
0.2%
Top 86% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Heap Overflow HIGH

A heap overflow occurs when a program writes data beyond the bounds of a buffer allocated in the heap memory region.

Affected Products (CPE)NVD

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 in Informix Dynamic Server

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CVE-2012-3334 CRITICAL
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Stack-based buffer overflow in IBM Informix Dynamic Server (IDS) 11.50 before 11.50.xC9W2 and 11.70 before 11.70.xC5 all
CVE-2012-4857 CRITICAL
9.0 Dec 08

Buffer overflow in IBM Informix 11.50 through 11.50.xC9W2 and 11.70 before 11.70.xC7 allows remote authenticated users t
CVE-2026-13361 HIGH
8.8 Aug 12

Remote code execution in IBM Informix Dynamic Server 14.10, 12.10.x, and 15.0 is possible through a stack-based buffer o
CVE-2026-13367 HIGH
7.8 Aug 12

Local privilege escalation in IBM Informix Dynamic Server 14.10 and 15.0 allows any low-privileged local OS user to gain
CVE-2016-0226 HIGH
7.8 Mar 28

The client implementation in IBM Informix Dynamic Server 11.70.xCn on Windows does not properly restrict access to the (
CVE-2024-45675 HIGH
7.8 Dec 02

Local privilege escalation in IBM Informix Dynamic Server 14.10 allows a user who already holds a low-privilege account

CVE-2023-28523 HIGH
7.8 Dec 09

IBM Informix Dynamic Server 12.10 and 14.10 onsmsync is vulnerable to a heap buffer overflow, caused by improper bounds

CVE-2020-4799 HIGH
7.8 Oct 08

IBM Informix spatial 14.10 could allow a local user to execute commands as a privileged user due to an out of bounds wri
CVE-2019-4253 HIGH
7.8 Aug 20

IBM Informix Dynamic Server Enterprise Edition 12.1 could allow a local privileged Informix user to load a malicious sha
CVE-2025-1991 HIGH
7.5 Jun 28

IBM Informix Dynamic Server 12.10,14.10, and15.0 could allow a remote attacker to cause a denial of service due to an in
CVE-2026-13476 HIGH
7.3 Aug 12

Remote unauthenticated OS command injection in IBM Informix Dynamic Server 12.10, 14.10, and 15.0 allows network-accessi
CVE-2017-1508 MEDIUM
6.7 Sep 13

IBM Informix Dynamic Server 12.1 could allow a local user logged in with database administrator user to gain root privil

Same weakness CWE-122 – Heap-based Buffer Overflow

View all
CVE-2023-4911 HIGH POC
7.8
CVE-2023-27997 CRITICAL
9.8
CVE-2026-94127 CRITICAL POC
9.3
CVE-2025-25249 CRITICAL POC
9.8
CVE-2026-85880 HIGH POC
7.8
CVE-2025-24985 HIGH POC
7.8
CVE-2026-53362 HIGH POC
7.8
CVE-2025-21418 HIGH
7.8

Same technique Buffer Overflow

View all
CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

References

Advisories & patches
ADVISORY https://exchange.xforce.ibmcloud.com/vulnerabilities/251204 ADVISORY https://www.ibm.com/support/pages/node/7070188

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