CVE-2011-1147

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.

Published: 2011-03-15 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-1147 is rated Moderate Risk (58/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.52%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-1147

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 3.42% 3.52% +0.10%
2 2025-09-14 2.83% 3.42% +0.59%
3 2025-03-30 — 2.83% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-1147

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2011-1147

OS Trackers for CVE-2011-1147

vendor priority summary link
debian not yet assigned CVE-2011-1147 not yet assigned priority: Debian including 1 source packages (asterisk), 2 status rows across 2 suites (bullseye, sid): resolved 2. https://security-tracker.debian.org/tracker/CVE-2011-1147
gentoo high CVE-2011-1147: 1 GLSA(s) (201110-21), 1 atom(s) (net-misc/asterisk); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-1147
ubuntu medium CVE-2011-1147 medium priority: Ubuntu including 1 source packages (asterisk), 7 status rows across 7 suites (dapper, hardy, karmic, lucid, maverick, natty, upstream): released 4, ignored 3. https://ubuntu.com/security/CVE-2011-1147

Affected software / configurations for CVE-2011-1147

Vendor Product Version Raw CPE
digium asterisk 1.4.0 cpe:2.3:a:digium:asterisk:1.4.0:*:*:*:*:*:*:*
digium asterisk 1.4.0 cpe:2.3:a:digium:asterisk:1.4.0:beta1:*:*:*:*:*:*
digium asterisk 1.4.0 cpe:2.3:a:digium:asterisk:1.4.0:beta2:*:*:*:*:*:*
digium asterisk 1.4.0 cpe:2.3:a:digium:asterisk:1.4.0:beta3:*:*:*:*:*:*
digium asterisk 1.4.0 cpe:2.3:a:digium:asterisk:1.4.0:beta4:*:*:*:*:*:*
digium asterisk 1.4.1 cpe:2.3:a:digium:asterisk:1.4.1:*:*:*:*:*:*:*
digium asterisk 1.4.2 cpe:2.3:a:digium:asterisk:1.4.2:*:*:*:*:*:*:*
digium asterisk 1.4.3 cpe:2.3:a:digium:asterisk:1.4.3:*:*:*:*:*:*:*
digium asterisk 1.4.10 cpe:2.3:a:digium:asterisk:1.4.10:*:*:*:*:*:*:*
digium asterisk 1.4.10.1 cpe:2.3:a:digium:asterisk:1.4.10.1:*:*:*:*:*:*:*
digium asterisk 1.4.11 cpe:2.3:a:digium:asterisk:1.4.11:*:*:*:*:*:*:*
digium asterisk 1.4.12 cpe:2.3:a:digium:asterisk:1.4.12:*:*:*:*:*:*:*
digium asterisk 1.4.12.1 cpe:2.3:a:digium:asterisk:1.4.12.1:*:*:*:*:*:*:*
digium asterisk 1.4.13 cpe:2.3:a:digium:asterisk:1.4.13:*:*:*:*:*:*:*
digium asterisk 1.4.14 cpe:2.3:a:digium:asterisk:1.4.14:*:*:*:*:*:*:*
digium asterisk 1.4.15 cpe:2.3:a:digium:asterisk:1.4.15:*:*:*:*:*:*:*
digium asterisk 1.4.16 cpe:2.3:a:digium:asterisk:1.4.16:*:*:*:*:*:*:*
digium asterisk 1.4.16.1 cpe:2.3:a:digium:asterisk:1.4.16.1:*:*:*:*:*:*:*
digium asterisk 1.4.16.2 cpe:2.3:a:digium:asterisk:1.4.16.2:*:*:*:*:*:*:*
digium asterisk 1.4.17 cpe:2.3:a:digium:asterisk:1.4.17:*:*:*:*:*:*:*
digium asterisk 1.4.18 cpe:2.3:a:digium:asterisk:1.4.18:*:*:*:*:*:*:*
digium asterisk 1.4.19 cpe:2.3:a:digium:asterisk:1.4.19:*:*:*:*:*:*:*
digium asterisk 1.4.19 cpe:2.3:a:digium:asterisk:1.4.19:rc1:*:*:*:*:*:*
digium asterisk 1.4.19 cpe:2.3:a:digium:asterisk:1.4.19:rc2:*:*:*:*:*:*
digium asterisk 1.4.19 cpe:2.3:a:digium:asterisk:1.4.19:rc3:*:*:*:*:*:*
digium asterisk 1.4.19 cpe:2.3:a:digium:asterisk:1.4.19:rc4:*:*:*:*:*:*
digium asterisk 1.4.19.1 cpe:2.3:a:digium:asterisk:1.4.19.1:*:*:*:*:*:*:*
digium asterisk 1.4.19.2 cpe:2.3:a:digium:asterisk:1.4.19.2:*:*:*:*:*:*:*
digium asterisk 1.4.20 cpe:2.3:a:digium:asterisk:1.4.20:*:*:*:*:*:*:*
digium asterisk 1.4.20 cpe:2.3:a:digium:asterisk:1.4.20:rc1:*:*:*:*:*:*
digium asterisk 1.4.20 cpe:2.3:a:digium:asterisk:1.4.20:rc2:*:*:*:*:*:*
digium asterisk 1.4.20 cpe:2.3:a:digium:asterisk:1.4.20:rc3:*:*:*:*:*:*
digium asterisk 1.4.20.1 cpe:2.3:a:digium:asterisk:1.4.20.1:*:*:*:*:*:*:*
digium asterisk 1.4.21 cpe:2.3:a:digium:asterisk:1.4.21:*:*:*:*:*:*:*
digium asterisk 1.4.21 cpe:2.3:a:digium:asterisk:1.4.21:rc1:*:*:*:*:*:*
digium asterisk 1.4.21 cpe:2.3:a:digium:asterisk:1.4.21:rc2:*:*:*:*:*:*
digium asterisk 1.4.21.1 cpe:2.3:a:digium:asterisk:1.4.21.1:*:*:*:*:*:*:*
digium asterisk 1.4.21.2 cpe:2.3:a:digium:asterisk:1.4.21.2:*:*:*:*:*:*:*
digium asterisk 1.4.22 cpe:2.3:a:digium:asterisk:1.4.22:*:*:*:*:*:*:*
digium asterisk 1.4.22 cpe:2.3:a:digium:asterisk:1.4.22:rc1:*:*:*:*:*:*
digium asterisk 1.4.22 cpe:2.3:a:digium:asterisk:1.4.22:rc2:*:*:*:*:*:*
digium asterisk 1.4.22 cpe:2.3:a:digium:asterisk:1.4.22:rc3:*:*:*:*:*:*
digium asterisk 1.4.22 cpe:2.3:a:digium:asterisk:1.4.22:rc4:*:*:*:*:*:*
digium asterisk 1.4.22 cpe:2.3:a:digium:asterisk:1.4.22:rc5:*:*:*:*:*:*
digium asterisk 1.4.22.1 cpe:2.3:a:digium:asterisk:1.4.22.1:*:*:*:*:*:*:*
digium asterisk 1.4.22.2 cpe:2.3:a:digium:asterisk:1.4.22.2:*:*:*:*:*:*:*
digium asterisk 1.4.23 cpe:2.3:a:digium:asterisk:1.4.23:*:*:*:*:*:*:*
digium asterisk 1.4.23 cpe:2.3:a:digium:asterisk:1.4.23:rc1:*:*:*:*:*:*
digium asterisk 1.4.23 cpe:2.3:a:digium:asterisk:1.4.23:rc2:*:*:*:*:*:*
digium asterisk 1.4.23 cpe:2.3:a:digium:asterisk:1.4.23:rc3:*:*:*:*:*:*
digium asterisk 1.4.23 cpe:2.3:a:digium:asterisk:1.4.23:rc4:*:*:*:*:*:*
digium asterisk 1.4.23.1 cpe:2.3:a:digium:asterisk:1.4.23.1:*:*:*:*:*:*:*
digium asterisk 1.4.23.2 cpe:2.3:a:digium:asterisk:1.4.23.2:*:*:*:*:*:*:*
digium asterisk 1.4.24 cpe:2.3:a:digium:asterisk:1.4.24:*:*:*:*:*:*:*
digium asterisk 1.4.24 cpe:2.3:a:digium:asterisk:1.4.24:rc1:*:*:*:*:*:*
digium asterisk 1.4.24.1 cpe:2.3:a:digium:asterisk:1.4.24.1:*:*:*:*:*:*:*
digium asterisk 1.4.25 cpe:2.3:a:digium:asterisk:1.4.25:*:*:*:*:*:*:*
digium asterisk 1.4.25 cpe:2.3:a:digium:asterisk:1.4.25:rc1:*:*:*:*:*:*
digium asterisk 1.4.25.1 cpe:2.3:a:digium:asterisk:1.4.25.1:*:*:*:*:*:*:*
digium asterisk 1.4.26 cpe:2.3:a:digium:asterisk:1.4.26:*:*:*:*:*:*:*
digium asterisk 1.4.26 cpe:2.3:a:digium:asterisk:1.4.26:rc1:*:*:*:*:*:*
digium asterisk 1.4.26 cpe:2.3:a:digium:asterisk:1.4.26:rc2:*:*:*:*:*:*
digium asterisk 1.4.26 cpe:2.3:a:digium:asterisk:1.4.26:rc3:*:*:*:*:*:*
digium asterisk 1.4.26 cpe:2.3:a:digium:asterisk:1.4.26:rc4:*:*:*:*:*:*
digium asterisk 1.4.26 cpe:2.3:a:digium:asterisk:1.4.26:rc5:*:*:*:*:*:*
digium asterisk 1.4.26 cpe:2.3:a:digium:asterisk:1.4.26:rc6:*:*:*:*:*:*
digium asterisk 1.4.26.1 cpe:2.3:a:digium:asterisk:1.4.26.1:*:*:*:*:*:*:*
digium asterisk 1.4.26.2 cpe:2.3:a:digium:asterisk:1.4.26.2:*:*:*:*:*:*:*
digium asterisk 1.4.26.3 cpe:2.3:a:digium:asterisk:1.4.26.3:*:*:*:*:*:*:*
digium asterisk 1.4.27 cpe:2.3:a:digium:asterisk:1.4.27:*:*:*:*:*:*:*
digium asterisk 1.4.27 cpe:2.3:a:digium:asterisk:1.4.27:rc1:*:*:*:*:*:*
digium asterisk 1.4.27 cpe:2.3:a:digium:asterisk:1.4.27:rc2:*:*:*:*:*:*
digium asterisk 1.4.27 cpe:2.3:a:digium:asterisk:1.4.27:rc3:*:*:*:*:*:*
digium asterisk 1.4.27 cpe:2.3:a:digium:asterisk:1.4.27:rc4:*:*:*:*:*:*
digium asterisk 1.4.27 cpe:2.3:a:digium:asterisk:1.4.27:rc5:*:*:*:*:*:*
digium asterisk 1.4.27.1 cpe:2.3:a:digium:asterisk:1.4.27.1:*:*:*:*:*:*:*
digium asterisk 1.4.28 cpe:2.3:a:digium:asterisk:1.4.28:*:*:*:*:*:*:*
digium asterisk 1.4.28 cpe:2.3:a:digium:asterisk:1.4.28:rc1:*:*:*:*:*:*
digium asterisk 1.4.29 cpe:2.3:a:digium:asterisk:1.4.29:*:*:*:*:*:*:*
digium asterisk 1.4.29 cpe:2.3:a:digium:asterisk:1.4.29:rc1:*:*:*:*:*:*

References for CVE-2011-1147

cvelogic Threat Intelligence