Several security issues have been found in various packages in Stronghold
4.0:

A flaw in the handling of regular expressions from configuration files
in the Apache HTTP Server could lead to a buffer overflow. To exploit this
issue, an attacker would need to have the ability to write to Apache
configuration files such as .htaccess or httpd.conf. (CVE-2003-0542)

mod_digest did not properly verify the nonce of a client response by using
a AuthNonce secret. This could allow a malicious user who is able to sniff
network traffic to conduct a replay attack against a website using Digest
protection. Note that mod_digest implements an older version of the MD5
Digest Authentication specification which is known not to work with modern
browsers. This issue does not affect mod_auth_digest. (CVE-2003-0987)

A buffer overflow in the Apache proxy module, mod_proxy, which
could be triggered by receiving an invalid Content-Length header. In order
to exploit this issue, an attacker would need an Apache installation
that was configured as a proxy to connect to a malicious site. This would
cause the Apache child processing the request to crash. (CVE-2004-0492)

A buffer overflow in the get_tag function in mod_include allowed local
users who can create SSI documents to execute arbitrary code as the apache
user via SSI (XSSI) documents that trigger a length calculation error.
(CVE-2004-0940)