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use strict;
use warnings;
...
        my $AV = $cve_entry->find('//entry/vuln:cvss/cvss:base_metrics
+/cvss:access-complexity');
        # etc...
}

<?xml version='1.0' encoding='UTF-8'?>
<nvd xmlns:cpe-lang="http://cpe.mitre.org/language/2.0" xmlns:vuln="ht
+tp://scap.nist.gov/schema/vulnerability/0.4" xmlns:cvss="http://scap.
+nist.gov/schema/cvss-v2/0.2" xmlns:xsi="http://www.w3.org/2001/XMLSch
+ema-instance" xmlns="http://scap.nist.gov/schema/feed/vulnerability/2
+.0" nvd_xml_version="2.0" pub_date="2009-01-28T03:10:00" xsi:schemaLo
+cation="http://scap.nist.gov/schema/feed/vulnerability/2.0 http://nvd
+.nist.gov/schema/nvd-cve-feed_2.0.xsd">
...
        </cvss:base_metrics>
    </vuln:cvss>
</entry>