An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer dereference.
Created libvncserver tracking bugs for this issue:
Affects: epel-7 [bug 1860346]
Affects: fedora-all [bug 1860345]
libvncserver/rfbregion.c's sraSpanInsertAfter(), sraSpanInsertBefore(), sraSpanRemove() and libvncserver/rfbserver.c's rfbClientIteratorNext(), and rfbReleaseClientIterator() are missing NULL checks for sraSpan * and rfbClientIteratorPtr parameters. If one of them is NULL, this could cause a crash.
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):
This issue has been addressed in the following products:
Red Hat Enterprise Linux 8
Via RHSA-2021:1811 https://access.redhat.com/errata/RHSA-2021:1811