HOME VULNERABILITIESCVE-2011-1147

MEDIUM

CVE-2011-1147

CWE-119Published: March 15, 2011· Updated: Jun 16, 2026

6.8

CVSS v3.1

Official Description

Multiple stack-based and heap-based buffer overflows in the (1) decode_open_type and (2) udptl_rx_packet functions in main/udptl.c in Asterisk Open Source 1.4.x before 1.4.39.2, 1.6.1.x before 1.6.1.22, 1.6.2.x before 1.6.2.16.2, and 1.8 before 1.8.2.4; Business Edition C.x.x before C.3.6.3; AsteriskNOW 1.5; and s800i (Asterisk Appliance), when T.38 support is enabled, allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted UDPTL packet.

Technical Analysis

CVE-2011-1147 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.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityM

Privileges Req.

User Interaction

Scope

Impact

ConfidentialityP

IntegrityP

AvailabilityP

AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected Vendors & Products

digium3 product(s)

asteriskasterisknows800i

Source: NVD CPE · 112 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://lists.fedoraproject.org/pipermail/package-announce/2011-March/055030.html

PATCHhttp://lists.fedoraproject.org/pipermail/package-announce/2011-March/055421.html

PATCHhttp://lists.fedoraproject.org/pipermail/package-announce/2011-March/055634.html

PATCHhttp://lists.fedoraproject.org/pipermail/package-announce/2011-March/055030.html

PATCHhttp://lists.fedoraproject.org/pipermail/package-announce/2011-March/055421.html

PATCHhttp://lists.fedoraproject.org/pipermail/package-announce/2011-March/055634.html

ADVISORYhttp://downloads.asterisk.org/pub/security/AST-2011-002.html

ADVISORYhttp://secunia.com/advisories/43429

ADVISORYhttp://secunia.com/advisories/43702

ADVISORYhttp://www.vupen.com/english/advisories/2011/0635

ADVISORYhttp://downloads.asterisk.org/pub/security/AST-2011-002.html

ADVISORYhttp://secunia.com/advisories/43429

ADVISORYhttp://secunia.com/advisories/43702

ADVISORYhttp://www.vupen.com/english/advisories/2011/0635

All References (24)

→

http://downloads.asterisk.org/pub/security/AST-2011-002.htmlVendor Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2011-March/055030.htmlPatch

→

http://lists.fedoraproject.org/pipermail/package-announce/2011-March/055421.htmlPatch

→

http://lists.fedoraproject.org/pipermail/package-announce/2011-March/055634.htmlPatch

→

http://secunia.com/advisories/43429Vendor Advisory

→

http://secunia.com/advisories/43702Vendor Advisory

→

http://www.debian.org/security/2011/dsa-2225

→

http://www.openwall.com/lists/oss-security/2011/03/11/2

→

http://www.openwall.com/lists/oss-security/2011/03/11/8

→

http://www.securityfocus.com/bid/46474

→

http://www.securitytracker.com/id?1025101

→

http://www.vupen.com/english/advisories/2011/0635Vendor Advisory

→

http://downloads.asterisk.org/pub/security/AST-2011-002.htmlVendor Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2011-March/055030.htmlPatch

→

http://lists.fedoraproject.org/pipermail/package-announce/2011-March/055421.htmlPatch

Quick Facts

CVE IDCVE-2011-1147

CVSS Score6.8 / 10

SeverityMEDIUM

WeaknessCWE-119

CISA KEVNo

Affected1 vendor(s)

PublishedMar 15, 2011

Related CVEs (CWE-119)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2011-1147 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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