CVE-2009-0758

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.

Published: 2009-03-03 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-0758 is rated Moderate Risk (59.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.01%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2009-0758

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.12% 2.01% +0.89%
2 2025-07-23 1.26% 1.12% -0.14%
3 2025-03-30 — 1.26% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-0758

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2009-0758

OS Trackers for CVE-2009-0758

vendor priority summary link
debian low CVE-2009-0758 low priority: Debian including 1 source packages (avahi), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2009-0758
gentoo normal CVE-2009-0758: 1 GLSA(s) (200904-10), 1 atom(s) (net-dns/avahi); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-0758
redhat low — https://access.redhat.com/security/cve/CVE-2009-0758
suse high CVE-2009-0758 severity important: SUSE including 164 source package names (avahi-0.6.23-11.14.1, avahi-0.6.23-11.19.22, …), 305 product×package rows across 34 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (34 product lines)): Fixed 305. https://www.suse.com/security/cve/CVE-2009-0758/
ubuntu low CVE-2009-0758 low priority: Ubuntu including 1 source packages (avahi), 8 status rows across 8 suites (dapper, gutsy, hardy, intrepid, jaunty, karmic, lucid, upstream): ignored 3, released 3, not-affected 2. https://ubuntu.com/security/CVE-2009-0758

Vendor comments (NVD) for CVE-2009-0758

  • Red Hat (2010-07-13T00:00:00)

    This issue has been addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2010-0528.html.

Affected software / configurations for CVE-2009-0758

Vendor Product Version Raw CPE
avahi avahi-daemon 0.6.23 cpe:2.3:a:avahi:avahi-daemon:0.6.23:*:*:*:*:*:*:*

References for CVE-2009-0758

cvelogic Threat Intelligence