The originates_from_local_legacy_unicast_socket function (avahi-core/server.c) in avahi-daemon in Avahi before 0.6.24 allows remote attacker
The originates_from_local_legacy_unicast_socket function (avahi-core/server.c) in avahi-daemon in Avahi before 0.6.24 allows remote attackers to cause a denial of service (crash) via a crafted mDNS packet with a source port of 0, which triggers an assertion failure.
- Published
- Dec 16, 2008
- Updated
- Jun 16, 2026
- EPSS
- 59.2% · 99th percentile
- CWE
- CWE-399
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Report tools
Action score
38
Monitor
Low priority for now.
- CVSS
- 20 / 40 · 5.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 18 / 30 · 59.2%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| avahi | avahi | cpe:2.3:a:avahi:avahi |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- avahi avahiup to 0.6.23 inclusive
- avahi avahi0.1
- avahi avahi0.2
- avahi avahi0.3
- avahi avahi0.4
- avahi avahi0.5
- avahi avahi0.5.1
- avahi avahi0.5.2
- avahi avahi0.6.1
- avahi avahi0.6.10
- avahi avahi0.6.11
- avahi avahi0.6.12
- avahi avahi0.6.13
- avahi avahi0.6.14
- avahi avahi0.6.15
- avahi avahi0.6.16
- avahi avahi0.6.17
- avahi avahi0.6.18
- avahi avahi0.6.19
- avahi avahi0.6.2
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | avahi | before 0.6.23-3 | 0.6.23-3 |
| Debian:4.0 | avahi | before 0.6.16-3etch2 | 0.6.16-3etch2 |
| Debian:5.0 | avahi | before 0.6.22-3+lenny1 | 0.6.22-3+lenny1 |
| openSUSE:Tumbleweed | avahi | before 0.8-7.2 | 0.8-7.2 |
| Red Hat:enterprise_linux:5::client | avahi-compat-howl | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client | avahi-compat-libdns_sd | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client | avahi-glib | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client | avahi-qt3 | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client | avahi-tools | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client_workstation | avahi | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client_workstation | avahi-compat-howl-devel | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client_workstation | avahi-compat-libdns_sd-devel | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client_workstation | avahi-debuginfo | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client_workstation | avahi-devel | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client_workstation | avahi-glib-devel | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
| Red Hat:enterprise_linux:5::client_workstation | avahi-qt3-devel | before 0:0.6.16-1.el5_2.1 | 0:0.6.16-1.el5_2.1 |
Same product
avahi: all recordsOther highest-scoring records for the same primary product.
- CVE-2017-6519avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, whic37Monitor
- CVE-2021-26720avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a 31Monitor
- CVE-2011-1002avahi-core/socket.c in avahi-daemon in Avahi before 0.6.29 allows remote attackers to cause a denial of service (infinite loop) via an empty29Monitor
- CVE-2026-24401Avahi has Uncontrolled Recursion in lookup_handle_cname function26Monitor
- CVE-2025-68471Avahi has a reachable assertion in lookup_start26Monitor
- CVE-2025-68468Avahi has a reachable assertion in lookup_multicast_callback26Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:avahi | 0.6.23-3 · Debian:12 | Package registry (OSV) |
| opensuse:avahi | 0.8-7.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:avahi | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:avahi-compat-howl | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:avahi-compat-howl-devel | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:avahi-compat-libdns_sd | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:avahi-compat-libdns_sd-devel | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:avahi-debuginfo | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:avahi-devel | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:avahi-glib | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:avahi-glib-devel | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:avahi-qt3 | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:avahi-qt3-devel | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:avahi-tools | 0:0.6.16-1.el5_2.1 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Metasploit module ×1
- Exploit-DB entry ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | dos | 2008-12-19 |
| Metasploit module | auxiliary/dos/mdns/avahi_portzeroAvahi Source Port 0 DoSauxiliary | 2008-11-14 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Metasploit-33 d
- Published
- First PoC+2 d
- TodaySep 30, 2026+6497 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- P
Weakness class (CWE)
CWE-399 · Resource Management ErrorsCVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- avahi.org/milestone/Avahi%200.6.24
- lists.opensuse.org/opensuse-security-announce/2009-02/msg00000.html
- secunia.com/advisories/33153
- secunia.com/advisories/33220
- secunia.com/advisories/33279
- secunia.com/advisories/33475
- security.gentoo.org/glsa/glsa-200901-11.xml
- www.debian.org/security/2008/dsa-1690
- www.openwall.com/lists/oss-security/2008/12/14/1
- www.securityfocus.com/bid/32825
- www.ubuntu.com/usn/usn-696-1
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9987
- www.exploit-db.com/exploits/7520
Vendor advisories and official records. Exploit/PoC links are deliberately left out.