The following advisory data is extracted from:
https://access.redhat.com/security/data/csaf/v2/advisories/2023/rhsa-2023_7836.json
Red Hat officially shut down their mailing list notifications October 10, 2023.  Due to this, Packet Storm has recreated the below data as a reference point to raise awareness.  It must be noted that due to an inability to easily track revision updates without crawling Red Hat's archive, these advisories are single notifications and we strongly suggest that you visit the Red Hat provided links to ensure you have the latest information available if the subject matter listed pertains to your environment.
- Packet Storm Staff
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Red Hat Security Advisory
Synopsis:           Moderate: avahi security update
Advisory ID:        RHSA-2023:7836-03
Product:            Red Hat Enterprise Linux
Advisory URL:       https://access.redhat.com/errata/RHSA-2023:7836
Issue date:         2023-12-14
Revision:           03
CVE Names:          CVE-2021-3468
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Summary: 
An update for avahi is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Description:
Avahi is an implementation of the DNS Service Discovery and Multicast DNS specifications for Zero Configuration Networking. It facilitates service discovery on a local network. Avahi and Avahi-aware applications allow you to plug your computer into a network and, with no configuration, view other people to chat with, view printers to print with, and find shared files on other computers.
Security Fix(es):
* avahi: Local DoS by event-busy-loop from writing long lines to /run/avahi-daemon/socket (CVE-2021-3468)
* avahi: Reachable assertion in avahi_dns_packet_append_record (CVE-2023-38469)
* avahi: Reachable assertion in avahi_escape_label (CVE-2023-38470)
* avahi: Reachable assertion in dbus_set_host_name (CVE-2023-38471)
* avahi: Reachable assertion in avahi_rdata_parse (CVE-2023-38472)
* avahi: Reachable assertion in avahi_alternative_host_name (CVE-2023-38473)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Solution:
https://access.redhat.com/articles/11258
CVEs:
CVE-2021-3468
References:
https://access.redhat.com/security/updates/classification/#moderate
https://bugzilla.redhat.com/show_bug.cgi?id=1939614
https://bugzilla.redhat.com/show_bug.cgi?id=2191687
https://bugzilla.redhat.com/show_bug.cgi?id=2191690
https://bugzilla.redhat.com/show_bug.cgi?id=2191691
https://bugzilla.redhat.com/show_bug.cgi?id=2191692
https://bugzilla.redhat.com/show_bug.cgi?id=2191694