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CVE-2009-2726

7.8 · HIGH

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…

Published Aug 12, 2009digiumCWE-770EPSS 6.52%

Overview

CVE-2009-2726 is a high-severity vulnerability affecting digium asterisk. It was published on August 12, 2009 and has a CVSS 2.0 base score of 7.8 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from digium. Update asterisk to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
digiumasterisk>= 0, < b.2.5.9Affected
digiums800i_firmware>= 1.2.0, < 1.3.0.3Affected

References

Refdownloads.digium.com/pub/security/AST-2009-005.htmlReflabs.mudynamics.com/advisories/MU-200908-01.txtRefsecunia.com/advisories/36227Refwww.securityfocus.com/archive/1/505669/100/0/threadedRefwww.securityfocus.com/bid/36015Refwww.securitytracker.com/id?1022705Refwww.vupen.com/english/advisories/2009/2229Refdownloads.digium.com/pub/security/AST-2009-005.htmlReflabs.mudynamics.com/advisories/MU-200908-01.txtRefsecunia.com/advisories/36227

How CyberStrike helps

Frequently asked questions

What is CVE-2009-2726?

CVE-2009-2726 is a high-severity vulnerability affecting digium asterisk. It was published on August 12, 2009 and has a CVSS 2.0 base score of 7.8 (HIGH).

How severe is CVE-2009-2726?

This vulnerability has a CVSS 2.0 base score of 7.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-2726?

Check the references section for vendor advisories and patches from digium. Update asterisk to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-2726?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-2726 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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