srs2.c in PostSRSd before 1.10 allows remote attackers to cause a denial of service (CPU consumption) via a long timestamp tag in an SRS address.
https://security.gentoo.org/glsa/202107-08
https://lists.debian.org/debian-lts-announce/2020/12/msg00031.html
https://github.com/roehling/postsrsd/commit/4733fb11f6bec6524bb8518c5e1a699288c26bac