HOMEVULNERABILITIESCVE-2009-2726
HIGH

CVE-2009-2726

CWE-770Published: August 12, 2009· Updated: Jun 16, 2026

7.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2009-2726 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityNone
IntegrityNone
AvailabilityC
AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected Vendors & Products

digium3 product(s)
asterisks800i firmwares800i
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://secunia.com/advisories/36227
ADVISORYhttp://www.securityfocus.com/archive/1/505669/100/0/threaded
ADVISORYhttp://www.securityfocus.com/bid/36015
ADVISORYhttp://www.securitytracker.com/id?1022705
ADVISORYhttp://www.vupen.com/english/advisories/2009/2229
ADVISORYhttp://secunia.com/advisories/36227
ADVISORYhttp://www.securityfocus.com/archive/1/505669/100/0/threaded
ADVISORYhttp://www.securityfocus.com/bid/36015
ADVISORYhttp://www.securitytracker.com/id?1022705
ADVISORYhttp://www.vupen.com/english/advisories/2009/2229

All References (14)

→
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

Quick Facts

CVE IDCVE-2009-2726
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-770
CISA KEVNo
Affected1 vendor(s)
PublishedAug 12, 2009

Related CVEs (CWE-770)

CVE-2023-38507
9.8
CVE-2022-3439
9.8
CVE-2022-3273
9.8
CVE-2023-25156
9.8
CVE-2022-3456
9.8
CVE-2025-11832
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2009-2726 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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