CVE-2025-59529: avahi · Uncontrolled Resource Consumption
Affects avahiSource CVE Database V5
Public exploit available · CVSS 5.5 Medium.
Data as of 26 Oct 2026, 11:07 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- CISA SSVC
- Exploitation
- Proof of concept is public or traded
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2025-12-18.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitation evidence
t = 0 is the CVE’s publication on cve.org
Disclosed: evidence found.
CVE published 18 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: evidence found.
CISA SSVC: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
Timeline
CVE ID reserved
by GitHub, Inc.
, 92 days before disclosure
CVE published
on cve.org
, t = 0
CISA SSVC assessment
proof of concept public
, 16 minutes after disclosure
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA SSVC, the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| avahiavahi | Affected
| Fixed in– |
AI-suggested
Workarounds include changing the permissions of the unix socket /run/avahi-daemon/socket after the daemon starts to restrict access, and applying additional access controls such as SELinux policies to prevent unauthorized tools from accessing the socket. Resolution requests via DBus and tools using DBus interfaces are not affected and can be used as alternatives. Monitor the vendor's repository for the candidate fix in pull request 808 and apply it once officially released.
Description
CVE-2025-59529 is an uncontrolled resource consumption vulnerability in Avahi versions up to and including 0.9-rc5. The Avahi simple protocol server ignores the documented client limit and accepts unlimited connections, allowing local unprivileged users to exhaust daemon memory and file descriptors. This leads to a denial of service affecting mDNS/DNS-SD resolution system-wide. The vulnerability does not affect resolution requests via DBus or certain Avahi tools using DBus. No official patch is available at the time of publication, but a candidate fix exists in a pull request. Workarounds include changing permissions on the unix socket or applying access restrictions such as SELinux.
References
- github.com/avahi/avahi/security/advisories/GHSA-73wf-3xmj-x82q (opens in a new tab)
- github.com/avahi/avahi/pull/808 (opens in a new tab)
- github.com/avahi/avahi/pull/975 (opens in a new tab)
- zeropath.com/blog/avahi-simple-protocol-server-dos-cve-2025-59529 (opens in a new tab)
- openwall.com/lists/oss-security/2025/12/19/1 (opens in a new tab)