The Debut embedded http server contains a remotely exploitable denial of service where a single malformed HTTP POST request can cause the server to hang until eventually replying (~300 seconds) with an HTTP 500 error. While the server is hung, print jobs over the network are blocked and the web interface is inaccessible. An attacker can continuously send this malformed request to keep the device inaccessible to legitimate traffic.

Null pointer dereference vulnerability exists in multiple vendors MFPs and printers which implement Debut web server 1.2 or 1.3. Processing a specially crafted request may lead an affected product to a denial-of-service (DoS) condition. As for the affected products/models/versions, see the detailed information provided by each vendor.

Some Brother printers (such as the HL-L8360CDW v1.20) were affected by a stack buffer overflow vulnerability as the web server did not parse the cookie value properly. This would allow an attacker to execute arbitrary code on the device.

Some Brother printers (such as the HL-L8360CDW v1.20) were affected by a heap buffer overflow vulnerability as the IPP service did not parse attribute names properly. This would allow an attacker to execute arbitrary code on the device.

Some Brother printers (such as the HL-L8360CDW v1.20) were affected by different information disclosure vulnerabilities that provided sensitive information to an unauthenticated user who visits a specific URL.

Profinet-IO (PNIO) stack versions prior V06.00 do not properly limit internal resource allocation when multiple legitimate diagnostic package requests are sent to the DCE-RPC interface. This could lead to a denial of service condition due to lack of memory for devices that include a vulnerable version of the stack. The security vulnerability could be exploited by an attacker with network access to an affected device. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise the availability of the device.

Affected devices improperly handle large amounts of specially crafted UDP packets. This could allow an unauthenticated remote attacker to trigger a denial of service condition.

An attacker with network access to an affected product may cause a denial of service condition by breaking the real-time synchronization (IRT) of the affected installation.

Specially crafted packets sent to port 161/udp could cause a denial of service condition. The affected devices must be restarted manually.

Denial of Service vulnerability in Debut embedded httpd 1.20 in Brother DCP-J132W (and probably other DCP models) allows remote attackers to hang the printer (disrupting its network connection) by sending a large amount of HTTP packets.