CVE-2009-3699
CriticalPublic exploitStack-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.
Published Oct 15, 2009 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2009-3699 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Vios (Ibm), Aix (Ibm).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 62% probability of exploitation in the next 30 days.
- Fixed versions are available, including Vios 2.1.0.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
10.0
AV:N/AC:L/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
62%
Higher than 99.1% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2009-3699 brief as a PDF
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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.
Affected Products
31 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ViosIbm | 1.4, 1.5.0, 1.5.1, 1.5.2 | 2.1.0 |
| AixIbm | 5, 5.1, 5.1.0.10, 5.1l, 5.2, 5.2.0, 5.2.0.50, 5.2.0.54 | n/a |
Patched Releases
Vios
2.1.0
Timeline
Publicly disclosed
Oct 15, 2009
Last updated
Apr 22, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
- advisoryhttp://aix.software.ibm.com/aix/efixes/security/cmsd_advisory.asc
- advisory36978
- advisoryIZ62572
- patch20091007 IBM AIX rpc.cmsd Stack Buffer Overflow Vulnerability
- patch36615
FAQ
Common Questions.
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.
Affected: Vios (Ibm) versions 1.4, 1.5.0, 1.5.1, 1.5.2; Aix (Ibm) versions 5, 5.1, 5.1.0.10, 5.1l, 5.2, 5.2.0, 5.2.0.50, 5.2.0.54. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Vios 2.1.0.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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