CVE-2011-0220

Local-link service crash via malformed mDNS validation

Published Feb 5, 2020 · Updated Aug 6, 2024

Input validation failure in Apple Bonjour before 2011 allows remote attackers on the local network to crash the service with a crafted mDNS packet. The Bonjour Namespace Provider inadequately validates malformed multicast DNS packets, allowing its error-handling path to terminate the service unexpectedly. The sender must share the target's local network segment, and the documented consequence is loss of Bonjour service rather than a host crash or data compromise.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Input validation failure in Apple Bonjour before 2011 allows remote attackers on the local network to crash the service with a crafted mDNS packet. The Bonjour Namespace Provider inadequately validates malformed multicast DNS packets, allowing its error-handling path to terminate the service unexpectedly. The sender must share the target's local network segment, and the documented consequence is loss of Bonjour service rather than a host crash or data compromise.

The record

CVE
CVE-2011-0220
Published
Feb 5, 2020
Updated
Aug 6, 2024
Vendor
Apple
Product
Bonjour
Classifications
CWE-20, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=before 2011

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Apple · Bonjourversion=before 2011

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.9NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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