The kernel in Juniper Junos 10.4 before 10.4R14, 11.4 before 11.4R8, 11.4X27 before 11.4X27.43, 12.1 before 12.1R6, 12.1X44 before 12.1X44-D20, 12.2 before 12.2R4, and 12.3 before 12.3R2, in certain VLAN configurations with unrestricted arp-resp and proxy-arp settings, allows remote attackers to cause a denial of service (device crash) via a crafted ARP request, aka PR 842091.
flowd in Juniper Junos 10.4 before 10.4S14, 11.2 and 11.4 before 11.4R6-S2, and 12.1 before 12.1R6 on SRX devices, when certain Application Layer Gateways (ALGs) are enabled, allows remote attackers to cause a denial of service (daemon crash) via crafted TCP packets, aka PRs 727980, 806269, and 835593.
flowd in Juniper Junos 10.4 before 10.4R11 on SRX devices, when the MSRPC Application Layer Gateway (ALG) is enabled, allows remote attackers to cause a denial of service (daemon crash) via crafted MSRPC requests, aka PR 772834.
Juniper Junos 10.4 before 10.4S13, 11.4 before 11.4R7-S1, 12.1 before 12.1R5-S3, 12.1X44 before 12.1X44-D20, and 12.1X45 before 12.1X45-D10 on the SRX1400, SRX3400, and SRX3600 does not properly initialize memory locations used during padding of Ethernet packets, which allows remote attackers to obtain sensitive information by reading packet data, aka PR 829536, a related issue to CVE-2003-0001.
Memory leak in Juniper JUNOS Packet Forwarding Engine (PFE) allows remote attackers to cause a denial of service (memory exhaustion and device reboot) via certain IPv6 packets.
TCP, when using a large Window Size, makes it easier for remote attackers to guess sequence numbers and cause a denial of service (connection loss) to persistent TCP connections by repeatedly injecting a TCP RST packet, especially in protocols that use long-lived connections, such as BGP.