CVE-2009-0758
CVE-2009-0758 is a high-severity vulnerability in Avahi Avahi-daemon with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.
Key facts
- Severity: High (CVSS 2.0 base score 7.8)
- EPSS exploit prediction: 2% (79th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-399
- Affected product: Avahi Avahi-daemon
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2009-0758?
- CVE-2009-0758 has a CVSS 2.0 base score of 7.8, rated high severity.
- Is CVE-2009-0758 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2009-0758?
- CVE-2009-0758 affects Avahi Avahi-daemon. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2009-0758?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2009-0758 published?
- CVE-2009-0758 was published on 2009-03-03 and last updated on 2026-06-16.
References
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=517683
- http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00000.html
- http://secunia.com/advisories/38420
- http://www.debian.org/security/2010/dsa-2086
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:076
- http://www.openwall.com/lists/oss-security/2009/03/02/1
- http://www.securityfocus.com/bid/33946
Affected products (1)
- cpe:2.3:a:avahi:avahi-daemon:0.6.23:*:*:*:*:*:*:*
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