CVE DATABASE / CVE-2009-2726
CVE-2009-2726
Summary
The SIP channel driver in Asterisk Open Source 1.2.x before 1.2.34, 1.4.x before 1.4.26.1, 1.6.0.x before 1.6.0.12, and 1.6.1.x before 1.6.1.4; Asterisk Business Edition A.x.x, B.x.x before B.2.5.9, C.2.x before C.2.4.1, and C.3.x before C.3.1; and Asterisk Appliance s800i 1.2.x before 1.3.0.3 does not use a maximum width when invoking sscanf style functions, which allows remote attackers to cause a denial of service (stack memory consumption) via SIP packets containing large sequences of ASCII decimal characters, as demonstrated via vectors related to (1) the CSeq value in a SIP header, (2) large Content-Length value, and (3) SDP.
CVSS 2.0 breakdown
| Base score | 7.8 (HIGH) |
| Vector | AV:N/AC:L/Au:N/C:N/I:N/A:C |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Confidentiality | NONE |
| Integrity | NONE |
| Availability | COMPLETE |
Weakness type (CWE)
Affected products
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References
- http://downloads.digium.com/pub/security/AST-2009-005.html
- http://labs.mudynamics.com/advisories/MU-200908-01.txt
- http://secunia.com/advisories/36227
- http://www.securityfocus.com/archive/1/505669/100/0/threaded
- http://www.securityfocus.com/bid/36015
- http://www.securitytracker.com/id?1022705
- http://www.vupen.com/english/advisories/2009/2229
Data: NIST NVD. NVD last modified 2026-04-23. Always verify against the vendor advisory before acting.