Is CVE-2009-2726 in the CISA KEV catalog?

No. CVE-2009-2726 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-2726?

CVE-2009-2726 has a CVSS v2 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2009-2726?

CVE-2009-2726 has an EPSS score of 6.52% (93th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-2726?

Upgrade asterisk on debian 11 to 1:1.6.2.0~dfsg~rc1-1 or later.

CVE & CISA-KEV Catalog

CVE-2009-2726

HIGHEPSS 93th pctl

7.8

CVSS v2

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.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

asteriskDebian

Fixed in:1:1.6.2.0~dfsg~rc1-1CVE-2009-2726

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

6.52%probability of exploitation in 30 days

93rdpercentile

High risk: more likely to be exploited than 93% of all known CVEs.

References

Exploit1

securityfocus.com

Vendor Advisory2

Third-Party Advisory2

Product1

downloads.digium.com

Other references1

labs.mudynamics.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.