Tweak CVE-2021-25219 reference

diff --git a/doc/arm/reference.rst b/doc/arm/reference.rst
index d7e97953f34463ee45aa5897d6c5c64dc48bf42d..a40046e7013e131df03870cd1e805c74b4c4f0e5 100644 (file)
--- a/doc/arm/reference.rst
+++ b/doc/arm/reference.rst
@@ -4281,7 +4281,8 @@ Tuning
    :short: Sets the resolver's lame cache.
 
    This is always set to 0. More information is available in the
-   security advisory for :cve:`2021-25219`.
+   `security advisory for CVE-2021-25219
+   <https://kb.isc.org/docs/cve-2021-25219>`_.
 
 .. namedconf:statement:: servfail-ttl
    :tags: server