CVE-2025-59529Public exploit

Local service interruption via unlimited socket connections

Published Dec 18, 2025 · Updated Dec 18, 2025

Uncontrolled resource consumption in Avahi 0.9-rc2 and earlier allows local users to interrupt mDNS/DNS-SD service via UNIX-socket connections. server_work accepts each connection without checking CLIENTS_MAX, while client_new appends every client and increments the client count. Any unprivileged user with access to /run/avahi-daemon/socket can exhaust daemon memory and file descriptors, causing a crash or loss of local name resolution.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Avahi 0.9-rc2 and earlier allows local users to interrupt mDNS/DNS-SD service via UNIX-socket connections. server_work accepts each connection without checking CLIENTS_MAX, while client_new appends every client and increments the client count. Any unprivileged user with access to /run/avahi-daemon/socket can exhaust daemon memory and file descriptors, causing a crash or loss of local name resolution.

The record

CVE
CVE-2025-59529
Published
Dec 18, 2025
Updated
Dec 18, 2025
Vendor
Avahi
Product
Avahi
Classifications
CWE-400, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 0.9-rc2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Avahi · Avahiversion=<= 0.9-rc2

Published CVSS scores

5.5GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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