In FRRouting (FRR) through 9.1 it is possible for the getedge() function in ospfte.c in the OSPF daemon to return a NULL pointer. In cases where calling functions do not handle the returned NULL value the OSPF daemon crashes leading to denial of service.

In the Opaque LSA Extended Link parser in FRRouting (FRR) through 9.1 there can be a buffer overflow and daemon crash in ospfteparseextlink for OSPF LSA packets during an attempt to read Segment Routing Adjacency SID subTLVs (lengths are not validated).

In FRRouting (FRR) through 9.1 there can be a buffer overflow and daemon crash in ospfteparseri for OSPF LSA packets during an attempt to read Segment Routing subTLVs (their size is not validated).