CVE-2009-2726

Name: CVE-2009-2726
Creator: NVD / NIST
Published: 2009-08-12T10:30:01.11+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 6.52%

Last modified Jun 16, 2026

CVE-2009-2726 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 6.52% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

6.52%

92.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Digium	Asterisk	< b.2.5.9
Digium	Asterisk	>= c.2.0, <= c.2.4.1
Digium	Asterisk	>= c.3.0, < c.3.1
Digium	S800i Firmware	>= 1.2.0, < 1.3.0.3
Digium	Asterisk	>= 1.2.0, < 1.2.34
Digium	Asterisk	>= 1.4.0, < 1.4.26.1
Digium	Asterisk	>= 1.6.0, < 1.6.0.12
Digium	Asterisk	>= 1.6.1, < 1.6.1.4

References

http://downloads.digium.com/pub/security/AST-2009-005.htmlProduct
http://labs.mudynamics.com/advisories/MU-200908-01.txtBroken Link
http://secunia.com/advisories/36227Broken Link, Vendor Advisory
http://www.securityfocus.com/archive/1/505669/100/0/threadedBroken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/36015Broken Link, Exploit, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id?1022705Broken Link, Third Party Advisory, VDB Entry
http://www.vupen.com/english/advisories/2009/2229Broken Link, Vendor Advisory
http://downloads.digium.com/pub/security/AST-2009-005.htmlProduct
http://labs.mudynamics.com/advisories/MU-200908-01.txtBroken Link
http://secunia.com/advisories/36227Broken Link, Vendor Advisory
http://www.securityfocus.com/archive/1/505669/100/0/threadedBroken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/36015Broken Link, Exploit, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id?1022705Broken Link, Third Party Advisory, VDB Entry
http://www.vupen.com/english/advisories/2009/2229Broken Link, Vendor Advisory

Timeline

Published: Aug 12, 2009
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-2726?

How severe is CVE-2009-2726?

Severity scoring for CVE-2009-2726 is pending analysis. The EPSS model estimates a 6.52% probability of exploitation in the next 30 days.

How do I fix CVE-2009-2726?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-2726?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST