HOMEVULNERABILITIESCVE-2009-0871
LOW

CVE-2009-0871

CWE-20Published: March 11, 2009· Updated: Jun 16, 2026

3.5
CVSS v3.1

Official Description

The SIP channel driver in Asterisk Open Source 1.4.22, 1.4.23, and 1.4.23.1; 1.6.0 before 1.6.0.6; 1.6.1 before 1.6.1.0-rc2; and Asterisk Business Edition C.2.3, with the pedantic option enabled, allows remote authenticated users to cause a denial of service (crash) via a SIP INVITE request without any headers, which triggers a NULL pointer dereference in the (1) sip_uri_headers_cmp and (2) sip_uri_params_cmp functions.

NVD Source

Technical Analysis

CVE-2009-0871 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 ComplexityM
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityNone
IntegrityNone
AvailabilityP
AV:N/AC:M/Au:S/C:N/I:N/A:P

Affected Vendors & Products

digium1 product(s)
asterisk
Source: NVD CPE · 11 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

PATCHhttp://downloads.digium.com/pub/security/AST-2009-002.html
PATCHhttp://www.securityfocus.com/bid/34070
PATCHhttp://downloads.digium.com/pub/security/AST-2009-002.html
PATCHhttp://www.securityfocus.com/bid/34070
ADVISORYhttp://secunia.com/advisories/34229
ADVISORYhttp://secunia.com/advisories/34229

All References (18)

→
http://bugs.digium.com/view.php?id=13547
→
http://bugs.digium.com/view.php?id=14417
→
http://downloads.digium.com/pub/security/AST-2009-002.htmlPatch · Vendor Advisory
→
http://osvdb.org/52568
→
http://secunia.com/advisories/34229Vendor Advisory
→
http://www.securityfocus.com/archive/1/501656/100/0/threaded
→
http://www.securityfocus.com/bid/34070Patch
→
http://www.securitytracker.com/id?1021834
→
http://www.vupen.com/english/advisories/2009/0667
→
http://bugs.digium.com/view.php?id=13547
→
http://bugs.digium.com/view.php?id=14417
→
http://downloads.digium.com/pub/security/AST-2009-002.htmlPatch · Vendor Advisory
→
http://osvdb.org/52568
→
http://secunia.com/advisories/34229Vendor Advisory
→
http://www.securityfocus.com/archive/1/501656/100/0/threaded

Quick Facts

CVE IDCVE-2009-0871
CVSS Score3.5 / 10
SeverityLOW
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedMar 11, 2009

Related CVEs (CWE-20)

CVE-2008-4329
10.0
CVE-2008-4428
10.0
CVE-2008-5963
10.0
CVE-2008-4318
10.0
CVE-2008-0251
10.0
CVE-2008-3362
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2009-0871 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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