Description
avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, which allows remote attackers to cause a denial of service (traffic amplification) and may cause information leakage by obtaining potentially sensitive information from the responding device via port-5353 UDP packets. NOTE: this may overlap CVE-2015-2809.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | avahi | 0.7-5 | — |
| Debian 13 | avahi | 0.7-5 | — |
| Debian 12 | avahi | 0.7-5 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | avahi | 0.7-3.1ubuntu1.2 | USN-3876-1 |
| Ubuntu 16.04 LTS | avahi | 0.6.32~rc+dfsg-1ubuntu2.3 | USN-3876-1 |
| Ubuntu 14.04 LTS | avahi | 0.6.31-4ubuntu1.3 | USN-3876-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | avahi +21 | 0.6.31-20.el7 | RHSA-2020:1176 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | avahi | 0.8-7.2 | openSUSE-SU-2024:10643-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | avahi | 0.7-r2 | — |
| Alpine v3.23 | avahi | 0.7-r2 | — |
| Alpine v3.22 | avahi | 0.7-r2 | — |
| Alpine v3.21 | avahi | 0.7-r2 | — |
| Alpine v3.20 | avahi | 0.7-r2 | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | avahi | 0.7-r2 | — |
| Alpine v3.18 | avahi | 0.7-r2 | — |
| Alpine v3.17 | avahi | 0.7-r2 | — |
| Alpine v3.16 | avahi | 0.7-r2 | — |
| Alpine v3.15 | avahi | 0.7-r2 | — |
| Alpine v3.14 | avahi | 0.7-r2 | — |
| Alpine v3.13 | avahi | 0.7-r2 | — |
| Alpine v3.12 | avahi | 0.7-r2 | — |
| Alpine v3.11 | avahi | 0.7-r2 | — |
| Alpine v3.10 | avahi | 0.7-r2 | — |
| Alpine v3.9 | avahi | 0.7-r2 | — |
| Alpine v3.8 | avahi | 0.7-r2 | — |
| Alpine v3.7 | avahi | 0.6.32-r5 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | avahi +21 | 0.6.31-20.amzn2 | ALAS2-2020-1502 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | avahi | 0.8-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | avahi +21 | 0.6.31-20.el7 | ELSA-2020-1176 |
Advisories 6
- RHSA-2020:1176 Red Hat Security Advisory: avahi security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-3876-1 avahi vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- openSUSE-SU-2024:10643-1 avahi-0.8-7.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-2548 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 2, 2025
- ALAS2-2020-1502 Low: avahi security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 22, 2020
- ELSA-2020-1176 Low: avahi security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 6, 2020
References
- https://github.com/lathiat/avahi/issues/203#issuecomment-449536790
- USN-3876-1 vendor-advisory
- https://github.com/lathiat/avahi/issues/203
- https://bugzilla.redhat.com/show_bug.cgi?id=1426712
- USN-3876-2 vendor-advisory
- https://www.secfu.net/advisories
- [bookkeeper-issues] 20200729 [GitHub] [bookkeeper] padma81 opened a new issue #2387: Security vulnerabilities in the apache/bookkeeper-4.9.2 image mailing-list