HOME VULNERABILITIESCVE-2011-0495

MEDIUM

CVE-2011-0495

CWE-787Published: January 20, 2011· Updated: Jun 16, 2026

6.0

CVSS v3.1

Official Description

Stack-based buffer overflow in the ast_uri_encode function in main/utils.c in Asterisk Open Source before 1.4.38.1, 1.4.39.1, 1.6.1.21, 1.6.2.15.1, 1.6.2.16.1, 1.8.1.2, 1.8.2.; and Business Edition before C.3.6.2; when running in pedantic mode allows remote authenticated users to execute arbitrary code via crafted caller ID data in vectors involving the (1) SIP channel driver, (2) URIENCODE dialplan function, or (3) AGI dialplan function.

Technical Analysis

CVE-2011-0495 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-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityM

Privileges Req.

User Interaction

Scope

Impact

ConfidentialityP

IntegrityP

AvailabilityP

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

Affected Vendors & Products

Debian1 product(s)

debian linux

digium4 product(s)

asteriskasterisknows800i firmwares800i

Fedora1 product(s)

fedora

Source: NVD CPE · 7 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://downloads.asterisk.org/pub/security/AST-2011-001-1.6.2.diff

PATCHhttp://downloads.asterisk.org/pub/security/AST-2011-001-1.6.2.diff

ADVISORYhttp://downloads.asterisk.org/pub/security/AST-2011-001.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2011-February/053689.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2011-February/053713.html

ADVISORYhttp://secunia.com/advisories/42935

ADVISORYhttp://secunia.com/advisories/43119

ADVISORYhttp://secunia.com/advisories/43373

ADVISORYhttp://www.debian.org/security/2011/dsa-2171

ADVISORYhttp://www.securityfocus.com/archive/1/515781/100/0/threaded

ADVISORYhttp://www.securityfocus.com/bid/45839

ADVISORYhttps://exchange.xforce.ibmcloud.com/vulnerabilities/64831

ADVISORYhttp://downloads.asterisk.org/pub/security/AST-2011-001.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2011-February/053689.html

ADVISORYhttp://lists.fedoraproject.org/pipermail/package-announce/2011-February/053713.html

ADVISORYhttp://secunia.com/advisories/42935

ADVISORYhttp://secunia.com/advisories/43119

ADVISORYhttp://secunia.com/advisories/43373

ADVISORYhttp://www.debian.org/security/2011/dsa-2171

ADVISORYhttp://www.securityfocus.com/archive/1/515781/100/0/threaded

ADVISORYhttp://www.securityfocus.com/bid/45839

ADVISORYhttps://exchange.xforce.ibmcloud.com/vulnerabilities/64831

All References (30)

→

http://downloads.asterisk.org/pub/security/AST-2011-001-1.6.2.diffPatch · Vendor Advisory

→

http://downloads.asterisk.org/pub/security/AST-2011-001.htmlVendor Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2011-February/053689.htmlThird Party Advisory

→

http://lists.fedoraproject.org/pipermail/package-announce/2011-February/053713.htmlThird Party Advisory

→

http://osvdb.org/70518Broken Link

→

http://secunia.com/advisories/42935Third Party Advisory

→

http://secunia.com/advisories/43119Third Party Advisory

→

http://secunia.com/advisories/43373Third Party Advisory

→

http://www.debian.org/security/2011/dsa-2171Third Party Advisory

→

http://www.securityfocus.com/archive/1/515781/100/0/threadedThird Party Advisory · VDB Entry

→

http://www.securityfocus.com/bid/45839Third Party Advisory · VDB Entry

→

http://www.vupen.com/english/advisories/2011/0159Permissions Required

→

http://www.vupen.com/english/advisories/2011/0281Permissions Required

→

http://www.vupen.com/english/advisories/2011/0449Permissions Required

→

https://exchange.xforce.ibmcloud.com/vulnerabilities/64831Third Party Advisory · VDB Entry

Quick Facts

CVE IDCVE-2011-0495

CVSS Score6.0 / 10

SeverityMEDIUM

WeaknessCWE-787

CISA KEVNo

Affected3 vendor(s)

PublishedJan 20, 2011

Related CVEs (CWE-787)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2011-0495 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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