Is CVE-2011-1147 in the CISA KEV catalog?

No. CVE-2011-1147 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-1147?

CVE-2011-1147 has a CVSS v2 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2011-1147?

CVE-2011-1147 has an EPSS score of 3.52% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-1147?

Upgrade asterisk on debian 11 to 1:1.8.3.3-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-1147

MEDIUMEPSS 88th pctl

6.8

CVSS v2

NVD

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.

CWE-119Buffer Overflow

How to fix

Remediation Available

asteriskDebian

Fixed in:1:1.8.3.3-1CVE-2011-1147

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

3.52%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch3

Vendor Advisory4

Other references5

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.