CVE-2009-3699

CRITICAL ⚠ Exploit

Stack-based buffer overflow in libcsa.a (aka the calendar daemon library) in IBM AIX 5.x through 5.3.10 and 6.x through 6.1.3, and VIOS 2.1 and earlier, allows remote attackers to execute arbitrary...

Affects 2 products across 1 vendor.

CVSS 2.010.0
EPSS62.3%
Percentile99th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
CWE Weakness Definitions
CWE-119: Improper Restriction of Operations within Memory Buffer

Parent class for buffer-related vulnerabilities where operations exceed buffer boundaries.

Related Attack Patterns (CAPEC)
CAPEC-8 Buffer Overflow in an API Call
via CWE-119
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-119
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-119
CAPEC-14 Client-side Injection-induced Buffer Overflow
via CWE-119
CAPEC-24 Filter Failure through Buffer Overflow
via CWE-119
Show all 12

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

A stack-based buffer overflow vulnerability exists in the libcsa.a library used in IBM AIX and VIOS, which can be exploited by remote attackers to execute arbitrary code.

BSID: BS-2009-GLOBAL-228495-C • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2009-3699?
A stack-based buffer overflow vulnerability exists in the libcsa.a library used in IBM AIX and VIOS, which can be exploited by remote attackers to execute arbitrary code.
What is the CVSS score for CVE-2009-3699?
CVE-2009-3699 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 62.3%.
Is CVE-2009-3699 actively exploited?
Public exploit available for CVE-2009-3699. Exploitation risk elevated.
How do I remediate CVE-2009-3699?
Priority: IMMEDIATE. Advisory: http://www.ibm.com/support/docview.wss?uid=isg1IZ62572 PSIRT: [email protected]
What systems are affected by CVE-2009-3699?
CVE-2009-3699 affects Ibm Aix, Vios.
Vulnerability Details
CVE IDCVE-2009-3699
BSIDBS-2009-GLOBAL-228495-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published2009-10-15
Last Modified2026-06-16
ICS Relevance15%
Weakness (CWE)
Improper Restriction of Operations within Memory Buffer
SourceNVD
Official Description

Stack-based buffer overflow in libcsa.a (aka the calendar daemon library) in IBM AIX 5.x through 5.3.10 and 6.x through 6.1.3, and VIOS 2.1 and earlier, allows remote attackers to execute arbitrary code via a long XDR string in the first argument to procedure 21 of rpc.cmsd.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability is triggered by a long XDR string in the first argument to procedure 21 of the rpc.cmsd service, allowing attackers to overflow a buffer and execute arbitrary code with the privileges of the service.

Exploitation Likelihood: HIGH

Affected Products
VendorProductAffected Versions
Ibm Aix 5 5.1 5.1.0.10 5.1l 5.2 5.2.0
+19 more5.2.0.50 5.2.0.54 5.2.2 5.2_l 5.3 5.3.0 5.3.0.20 5.3.7 5.3.8 5.3.9 5.3.10 5.3_l 5.3_ml03 5l 6.1 6.1.0 6.1.1 6.1.2 6.1.3
Ibm Vios ≤ 2.1.0
Remediation
View Vendor Advisory →

Remediation Priority: IMMEDIATE

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 6210 Days
CISA known-exploitedNot in KEV catalog
Public Exploit⚠ Available — Reference
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
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