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Fencer Vulns
high 7.8

CVE-2009-0758 json

The originates_from_local_legacy_unicast_socket function in avahi-core/server.c in avahi-daemon 0.6.23 does not account for the network byt…

published 2009-03-03 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-0758

cvss
7.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

The originates_from_local_legacy_unicast_socket function in avahi-core/server.c in avahi-daemon 0.6.23 does not account for the network byte order of a port number when processing incoming multicast packets, which allows remote attackers to cause a denial of service (network bandwidth and CPU consumption) via a crafted legacy unicast mDNS query packet that triggers a multicast packet storm.

Patch / fix

  • avahi Debian 14, Debian 13, Debian 12 0.6.24-3

debian advisories DEBIAN-CVE-2009-0758

  • avahi RHEL 5 0.6.16-9.el5_5
  • avahi-qt3 RHEL 5 0.6.16-9.el5_5
  • avahi-glib RHEL 5 0.6.16-9.el5_5
  • avahi-tools RHEL 5 0.6.16-9.el5_5
  • avahi-compat-howl RHEL 5 0.6.16-9.el5_5
  • avahi-compat-libdns_sd RHEL 5 0.6.16-9.el5_5

red hat advisories RHSA-2010:0528

  • avahi openSUSE Tumbleweed 0.6.32-2.3

opensuse advisories openSUSE-SU-2024:10363-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-0758 updated cvss 3.3

avahi: remote DoS via legacy unicast mDNS queries

  • Red Hat Enterprise Linux (v. 5 server) avahi 0.6.16-9.el5_5, avahi-qt3 0.6.16-9.el5_5, avahi-glib 0.6.16-9.el5_5, avahi-tools 0.6.16-9.el5_5, avahi-compat-howl 0.6.16-9.el5_5, avahi-compat-libdns_sd 0.6.16-9.el5_5 Red Hat Enterprise Linux Desktop (v. 5 client) avahi 0.6.16-9.el5_5, avahi-qt3 0.6.16-9.el5_5, avahi-glib 0.6.16-9.el5_5, avahi-tools 0.6.16-9.el5_5, avahi-compat-howl 0.6.16-9.el5_5, avahi-compat-libdns_sd 0.6.16-9.el5_5 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) avahi 0.6.16-9.el5_5, avahi-qt3 0.6.16-9.el5_5, avahi-glib 0.6.16-9.el5_5, avahi-tools 0.6.16-9.el5_5, avahi-compat-howl 0.6.16-9.el5_5, avahi-compat-libdns_sd 0.6.16-9.el5_5
    fixed: vendor fix RHSA-2010:0528

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.01% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-399 Resource Management Errors

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.