Here are the details from the Slackware 13.37 ChangeLog:
+--------------------------+
patches/packages/httpd-2.2.21-i486-1_slack13.37.txz: Upgraded.
Respond with HTTP_NOT_IMPLEMENTED when the method is not
recognized. [Jean-Frederic Clere] SECURITY: CVE-2011-3348
Fix a regression introduced by the CVE-2011-3192 byterange fix in 2.2.20.
PR 51748. []
For more information, see:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3348
(* Security fix *)
+--------------------------+


Where to find the new packages:
+-----------------------------+

Thanks to the friendly folks at the OSU Open Source Lab
(http://osuosl.org) for donating FTP and rsync hosting
to the Slackware project! :-)

Also see the "Get Slack" section on http://slackware.com for
additional mirror sites near you.

Updated package for Slackware 12.0:
ftp://ftp.slackware.com/pub/slackware/slackware-12.0/patches/packages/httpd-2.2.21-i486-1_slack12.0.tgz

Updated package for Slackware 12.1:
ftp://ftp.slackware.com/pub/slackware/slackware-12.1/patches/packages/httpd-2.2.21-i486-1_slack12.1.tgz

Updated package for Slackware 12.2:
ftp://ftp.slackware.com/pub/slackware/slackware-12.2/patches/packages/httpd-2.2.21-i486-1_slack12.2.tgz

Updated package for Slackware 13.0:
ftp://ftp.slackware.com/pub/slackware/slackware-13.0/patches/packages/httpd-2.2.21-i486-1_slack13.0.txz

Updated package for Slackware x86_64 13.0:
ftp://ftp.slackware.com/pub/slackware/slackware64-13.0/patches/packages/httpd-2.2.21-x86_64-1_slack13.0.txz

Updated package for Slackware 13.1:
ftp://ftp.slackware.com/pub/slackware/slackware-13.1/patches/packages/httpd-2.2.21-i486-1_slack13.1.txz

Updated package for Slackware x86_64 13.1:
ftp://ftp.slackware.com/pub/slackware/slackware64-13.1/patches/packages/httpd-2.2.21-x86_64-1_slack13.1.txz

Updated package for Slackware 13.37:
ftp://ftp.slackware.com/pub/slackware/slackware-13.37/patches/packages/httpd-2.2.21-i486-1_slack13.37.txz

Updated package for Slackware x86_64 13.37:
ftp://ftp.slackware.com/pub/slackware/slackware64-13.37/patches/packages/httpd-2.2.21-x86_64-1_slack13.37.txz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/httpd-2.2.21-i486-1.txz

Updated package for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/httpd-2.2.21-x86_64-1.txz


MD5 signatures:
+-------------+

Slackware 12.0 package:
e6ed3d69eeb235a35799ad4fb43b02bb httpd-2.2.21-i486-1_slack12.0.tgz

Slackware 12.1 package:
531a640d39b1ec2f4216a8fa4cea9c52 httpd-2.2.21-i486-1_slack12.1.tgz

Slackware 12.2 package:
f93ceab045175be85509f0b9f7be0993 httpd-2.2.21-i486-1_slack12.2.tgz

Slackware 13.0 package:
569145d8fb1f800f04f4d6333f16f704 httpd-2.2.21-i486-1_slack13.0.txz

Slackware x86_64 13.0 package:
03f6c419d49e3c4a351956ad27d72fd6 httpd-2.2.21-x86_64-1_slack13.0.txz

Slackware 13.1 package:
1a218016a62fbaf8a110e6afcc6789b2 httpd-2.2.21-i486-1_slack13.1.txz

Slackware x86_64 13.1 package:
82eed1a8af9ab4545a18158f4a4641c1 httpd-2.2.21-x86_64-1_slack13.1.txz

Slackware 13.37 package:
d7c15df0fcc28648220ad329b0685f65 httpd-2.2.21-i486-1_slack13.37.txz

Slackware x86_64 13.37 package:
a192a12b1b63489733a7b8fc62435d3d httpd-2.2.21-x86_64-1_slack13.37.txz

Slackware -current package:
a16f461ad9843823811c40de6f38b63e n/httpd-2.2.21-i486-1.txz

Slackware x86_64 -current package:
0b4c491e383ea496020db90aa67b970c n/httpd-2.2.21-x86_64-1.txz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg httpd-2.2.21-i486-1_slack13.37.txz

Then, restart the httpd daemon.


+-----+

Slackware Linux Security Team
http://slackware.com/gpg-key