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NVD / CVE Program· CNA redhat

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…

MediumCVSS 6.8 · v2.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3.5% (FIRST EPSS); higher than 89.4% of all records.
  • Fixed version: asterisk (Debian:14) 1:1.8.3.3-1; asterisk (Debian:5.0) 1:1.4.21.2~dfsg-3+lenny2.1; asterisk (Debian:6.0) 1:1.6.2.9-2+squeeze2.

Low priority for now. Upgrade to asterisk (Debian:14) 1:1.8.3.3-1; asterisk (Debian:5.0) 1:1.4.21.2~dfsg-3+lenny2.1; asterisk (Debian:6.0) 1:1.6.2.9-2+squeeze2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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
Mar 15, 2011
Updated
Jun 16, 2026
EPSS
3.5% · 89th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
27 / 40 · 6.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
digiumasterisk
digiumasterisknow
digiums800i

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • digium asterisk1.4.0
  • digium asterisk1.4.1
  • digium asterisk1.4.10
  • digium asterisk1.4.10.1
  • digium asterisk1.4.11
  • digium asterisk1.4.12
  • digium asterisk1.4.12.1
  • digium asterisk1.4.13
+12 more rows
  • digium asterisk1.4.14
  • digium asterisk1.4.15
  • digium asterisk1.4.16
  • digium asterisk1.4.16.1
  • digium asterisk1.4.16.2
  • digium asterisk1.4.17
  • digium asterisk1.4.18
  • digium asterisk1.4.19
  • digium asterisk1.4.19.1
  • digium asterisk1.4.19.2
  • digium asterisk1.4.2
  • digium asterisk1.4.20

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:14asteriskbefore 1:1.8.3.3-11:1.8.3.3-1
Debian:5.0asteriskbefore 1:1.4.21.2~dfsg-3+lenny2.11:1.4.21.2~dfsg-3+lenny2.1
Debian:6.0asteriskbefore 1:1.6.2.9-2+squeeze21:1.6.2.9-2+squeeze2

Same product

digium: all records

Other highest-scoring records for the same primary product.

  • CVE-2006-5444Integer overflow in the get_input function in the Skinny channel driver (chan_skinny.c) in Asterisk 1.0.x before 1.0.12 and 1.2.x before…
    56Plan
  • CVE-2017-17850An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and older, and 13.18-cert1 and older.
    53Plan
  • CVE-2019-18610An issue was discovered in manager.c in Sangoma Asterisk through 13.x, 16.x, 17.x and Certified Asterisk 13.21 through 13.21-cert4.
    50Plan

Published before and after this one in the same product

  • ← EarlierCVE-2010-1224Apr 1, 2010 · main/acl.c in Asterisk Open Source 1.6.0.x before 1.6.0.25, 1.6.1.x before 1.6.1.17, and 1.6.2.x before 1.6.2.5 does not properly enforce…
    18Monitor
  • ← EarlierCVE-2011-0495Jan 20, 2011 · 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.
    25Monitor
  • Later →CVE-2011-1174Mar 31, 2011 · manager.c in Asterisk Open Source 1.6.1.x before 1.6.1.24, 1.6.2.x before 1.6.2.17.2, and 1.8.x before 1.8.3.2 allows remote attackers to…
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:asterisk1:1.8.3.3-1 · Debian:14Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

    If successful

    Confidentiality
    P · data can be read
    Integrity
    P · data or configuration can be modified
    Availability
    P · the service can be disrupted
    Attack complexity
    M
    Confidentiality impact
    P
    Integrity impact
    P
    Availability impact
    P

    Weakness class (CWE)

    CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

    CVSS vector

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

    nvd-primary

    Attack context

    MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

    ATT&CK techniques

    —

    References

    Show all references (11 more)

    Vendor advisories and official records. Exploit/PoC links are deliberately left out.

    All records