It was reported that the apache2 update released as DSA 4509-1
incorrectly fixed CVE-2019-10092. Updated apache2 packages are now
available to correct this issue. For reference, the relevant part of
the original advisory text follows.
Matei "Mal" Badanoiu reported a limited cross-site scripting
vulnerability in the mod_proxy error page.
For the oldstable distribution (stretch), this problem has been fixed
in version 2.4.25-3+deb9u9.
For the stable distribution (buster), this problem has been fixed in
We recommend that you upgrade your apache2 packages.