Several vulnerabilities have been found in the Apache HTTPD Server:

Stefan Esser discovered that the implementation of the max_input_vars configuration variable in a recent PHP security update was flawed such that it allows remote attackers to crash PHP or potentially execute code.

Nicolae Mogoreanu discovered a heap overflow in the emulated e1000e network interface card of QEMU, which is used in the xen-qemu-dm-4.0 packages. This vulnerability might enable to malicious guest systems to crash the host system or escalate their privileges.

Several vulnerabilities have been discovered in Cacti, a graphing tool for monitoring data. Multiple cross site scripting issues allow remote attackers to inject arbitrary web script or HTML. An SQL injection vulnerability allows remote attackers to execute arbitrary SQL commands.

Several vulnerabilities have been found in the Iceape internet suite, an unbranded version of Seamonkey:

Several vulnerabilities have been found in Tomcat, a servlet and JSP engine:

Several vulnerabilities have been discovered in Iceweasel, a web browser based on Firefox. The included XULRunner library provides rendering services for several other applications included in Debian.

Several vulnerabilities have been discovered in PHP, the web scripting language. The Common Vulnerabilities and Exposures project identifies the following issues:

Several vulnerabilities have been discovered in cURL, an URL transfer library. The Common Vulnerabilities and Exposures project identifies the following problems:

It was discovered that a buffer overflow in the Unicode library ICU could lead to the execution of arbitrary code.

Nicolae Mogoreanu discovered a heap overflow in the emulated e1000e network interface card of KVM, a solution for full virtualization on x86 hardware, which could result in denial of service or privilege escalation.

Laurent Butti discovered a buffer underflow in the LANalyzer dissector of the Wireshark network traffic analyzer, which could lead to the execution of arbitrary code (CVE-2012-0068).

Many security problems have been fixed in libxml2, a popular library to handle XML data files.

Julien Tinnes reported a buffer overflow in the Bip multiuser IRC proxy which may allow arbitrary code execution by remote users.

Antonio Martin discovered a denial-of-service vulnerability in OpenSSL, an implementation of TLS and related protocols. A malicious client can cause the DTLS server implementation to crash. Regular, TCP-based TLS is not affected by this issue.

Several vulnerabilities have been discovered in Rails, the Ruby web application framework. The Common Vulnerabilities and Exposures project identifies the following problems:

Several vulnerabilities have been discovered in phpMyAdmin, a tool to administer MySQL over the web. The Common Vulnerabilities and Exposures project identifies the following problems:

Several vulnerabilities were discovered in OpenSSL, an implementation of TLS and related protocols. The Common Vulnerabilities and Exposures project identifies the following vulnerabilities:

Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems:

Several vulnerabilities were discovered in t1lib, a Postscript Type 1 font rasterizer library, some of which might lead to code execution through the opening of files embedding bad fonts.

timtai1 discovered that simpleSAMLphp, an authentication and federation platform, is vulnerable to a cross site scripting attack, allowing a remote attacker to access sensitive client data.

Several vulnerabilities have been discovered in OpenTTD, a transport business simulation game. Multiple buffer overflows and off-by-one errors allow remote attackers to cause denial of service.

Ray Morris discovered that the PowerDNS authoritative server responds to response packets. An attacker who can spoof the source address of IP packets can cause an endless packet loop between a PowerDNS authoritative server and another DNS server, leading to a denial of service.