Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A configuration-dependent issue in rsyslog's optional imptcp input module can allow an unauthenticated remote peer to crash rsyslogd. The issue is not active in a default installation. Exploitation requires all of the following:

* imptcp is explicitly loaded.
* An imptcp listener uses the non-default framing.delimiter.regex mode.
* An attacker can establish a TCP connection to that listener.

A crafted input sequence during oversize-frame recovery can cause an invalid internal message length and terminate rsyslogd. No confidentiality or integrity impact, privilege escalation, or code execution has been identified. imtcp and the default imptcp framing modes are not affected.