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Vulnerability record · CVE-2009-2726 · published 12 August 2009

CVE-2009-2726: Digium asterisk allocation without limits vulnerability

Digium · Asterisk

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.

7.8 CVSS 2.0 High EPSS 6.5% · top 6.5% CWE-770 · Allocation without limits
7.8CVSS 2.0 base score
6.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
14References, 2 tagged exploit
16 Jun 2026Last modified by NVD

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.

AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://downloads.digium.com/pub/security/AST-2009-005.html Product
http://labs.mudynamics.com/advisories/MU-200908-01.txt Broken Link
http://secunia.com/advisories/36227 Broken LinkVendor Advisory
http://www.securityfocus.com/archive/1/505669/100/0/threaded Broken LinkThird Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/36015 Broken LinkExploitThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id?1022705 Broken LinkThird Party AdvisoryVDB Entry
http://www.vupen.com/english/advisories/2009/2229 Broken LinkVendor Advisory
http://downloads.digium.com/pub/security/AST-2009-005.html Product
http://labs.mudynamics.com/advisories/MU-200908-01.txt Broken Link
http://secunia.com/advisories/36227 Broken LinkVendor Advisory
http://www.securityfocus.com/archive/1/505669/100/0/threaded Broken LinkThird Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/36015 Broken LinkExploitThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id?1022705 Broken LinkThird Party AdvisoryVDB Entry
http://www.vupen.com/english/advisories/2009/2229 Broken LinkVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-2726), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.