Cisco IOS XE 3.4 before 3.4.2S and 3.5 before 3.5.1S on 1000 ASR devices allows remote attackers to cause a denial of service (device reload) via malformed ICMP error packets associated with a (1) TCP or (2) UDP session that is under inspection by the Zone-Based Firewall (ZBFW) component, aka Bug ID CSCtt26470.

The T1/E1 driver-queue functionality in Cisco IOS 12.2 and 15.0 through 15.3, when an HDLC32 driver is used, allows remote attackers to cause a denial of service (interface queue wedge) via bursty network traffic, aka Bug ID CSCub67465.

The DNS-over-TCP implementation in Cisco IOS 12.2 and 15.0 through 15.3, when NAT is used, allows remote attackers to cause a denial of service (device reload) via a crafted IPv4 DNS TCP stream, aka Bug ID CSCuf28733.

The TCP reassembly feature in Cisco IOS XE 3.7 before 3.7.3S and 3.8 before 3.8.1S on 1000 ASR devices allows remote attackers to cause a denial of service (device reload) via large TCP packets that are processed by the (1) NAT or (2) ALG component, aka Bug ID CSCud72509.

The web framework on Cisco Web Security Appliance (WSA), Email Security Appliance (ESA), and Content Security Management Appliance (SMA) devices does not properly manage the state of HTTP and HTTPS sessions, which allows remote attackers to cause a denial of service (management GUI outage) via multiple TCP connections, aka Bug IDs CSCuj59411, CSCuf89818, and CSCuh05635.

Cisco IOS 15.0 through 15.3 and IOS XE 3.2 through 3.8, when a VRF interface exists, allows remote attackers to cause a denial of service (interface queue wedge) via crafted UDP RSVP packets, aka Bug ID CSCuf17023.

Cisco IOS 12.2 through 12.4 and 15.0 through 15.3, and IOS XE 2.1 through 3.9, allows remote attackers to cause a denial of service (device reload) via crafted DHCP packets that are processed locally by a (1) server or (2) relay agent, aka Bug ID CSCug31561.

Cisco IOS XE 3.9 before 3.9.2S on 1000 ASR devices allows remote attackers to cause a denial of service (device reload) by sending malformed EoGRE packets over (1) IPv4 or (2) IPv6, aka Bug ID CSCuf08269.

The PPTP ALG implementation in Cisco IOS XE 3.9 before 3.9.2S on 1000 ASR devices allows remote attackers to cause a denial of service (device reload) by sending many PPTP packets over NAT, aka Bug ID CSCuh19936.

The Zone-Based Firewall (ZFW) feature in Cisco IOS 15.1 through 15.2, when content filtering or HTTP ALG inspection is enabled, allows remote attackers to cause a denial of service (device reload or hang) via crafted IPv4 HTTP traffic, aka Bug ID CSCtx56174.

A vulnerability in the email message filtering feature of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) and Cisco Content Security Management Appliance (SMA) could allow an unauthenticated, remote attacker to cause repeated crashes in some internal processes that are running on the affected devices, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient input validation of email attachments. An attacker could exploit this vulnerability by sending an email message with a crafted attachment through an affected device. A successful exploit could allow the attacker to cause specific processes to crash repeatedly, resulting in the complete unavailability of both the Cisco Advanced Malware Protection (AMP) and message tracking features and in severe performance degradation while processing email. After the affected processes restart, the software resumes filtering for the same attachment, causing the affected processes to crash and restart again. A successful exploit could also allow the attacker to cause a repeated DoS condition. Manual intervention may be required to recover from this situation.

The Next-Generation Firewall (aka NGFW, formerly CX Context-Aware Security) module 9.x before 9.1.1.9 and 9.1.2.x before 9.1.2.12 for Cisco Adaptive Security Appliances (ASA) devices allows remote attackers to cause a denial of service (device reload or traffic-processing outage) via fragmented (1) IPv4 or (2) IPv6 traffic, aka Bug ID CSCue88387.

Cisco IOS XR before 4.2.1 on ASR 9000 series devices and CRS series devices allows remote attackers to cause a denial of service (packet transmission outage) via a crafted packet, aka Bug IDs CSCty94537 and CSCtz62593.

A vulnerability in the implementation of the PROFINET Discovery and Configuration Protocol (PN-DCP) for Cisco IOS 12.2 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to the improper parsing of ingress PN-DCP Identify Request packets destined to an affected device. An attacker could exploit this vulnerability by sending a crafted PN-DCP Identify Request packet to an affected device and then continuing to send normal PN-DCP Identify Request packets to the device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. This vulnerability affects Cisco devices that are configured to process PROFINET messages. Beginning with Cisco IOS Software Release 12.2(52)SE, PROFINET is enabled by default on all the base switch module and expansion-unit Ethernet ports. Cisco Bug IDs: CSCuz47179.

The Cisco Unified IP Phone 8945 with software 9.3(2) allows remote attackers to cause a denial of service (device hang) via a malformed PNG file, aka Bug ID CSCud04270.

Cisco TelePresence TC Software before 6.1 and TE Software before 4.1.3 allow remote attackers to cause a denial of service (temporary device hang) via crafted SIP packets, aka Bug ID CSCuf89557.

The management API in the XML API management service in the Manager component in Cisco Unified Computing System (UCS) 1.x before 1.2(1b) allows remote attackers to cause a denial of service (service outage) via a malformed request, aka Bug ID CSCtg48206.

Cisco NX-OS on Nexus 5500 devices 4.x and 5.x before 5.0(3)N2(2), Nexus 3000 devices 5.x before 5.0(3)U3(2), and Unified Computing System (UCS) 6200 devices before 2.0(1w) allows remote attackers to cause a denial of service (device reload) by sending a jumbo packet to the management interface, aka Bug IDs CSCtx17544, CSCts10593, and CSCtx95389.

Cisco Unified Communications Manager (CUCM) 8.6 before 8.6(2a)su2, 8.6 BE3k before 8.6(4) BE3k, and 9.x before 9.0(1) allows remote attackers to cause a denial of service (CPU consumption and GUI and voice outages) via malformed packets to unused UDP ports, aka Bug ID CSCtx43337.

A vulnerability in the email message filtering feature of Cisco AsyncOS Software for Cisco Email Security Appliances could allow an unauthenticated, remote attacker to cause an affected device to stop scanning and forwarding email messages due to a denial of service (DoS) condition. Affected Products: This vulnerability affects all releases prior to the first fixed release of Cisco AsyncOS Software for Cisco Email Security Appliances, both virtual and hardware appliances, if the software is configured to apply a message filter or content filter to incoming email attachments. The vulnerability is not limited to any specific rules or actions for a message filter or content filter. More Information: CSCuz63143. Known Affected Releases: 8.5.7-042 9.7.0-125. Known Fixed Releases: 10.0.0-125 9.1.1-038 9.7.2-047.

The SIP implementation in Cisco Unified Communications Manager (CUCM) 6.x and 7.x before 7.1(5b)su5, 8.x before 8.5(1)su4, and 8.6 before 8.6(2a)su1; Cisco IOS 12.2 through 12.4 and 15.0 through 15.2; and Cisco IOS XE 3.3.xSG before 3.3.1SG, 3.4.xS, and 3.5.xS allows remote attackers to cause a denial of service (service crash or device reload) via a crafted SIP message containing an SDP session description, aka Bug IDs CSCtw66721, CSCtj33003, and CSCtw84664.

Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the improper parsing of crafted CIP packets destined to an affected device. An attacker could exploit these vulnerabilities by sending crafted CIP packets to be processed by an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvc43709.

A vulnerability in the software-based SSL/TLS message handler of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient validation of SSL/TLS messages when the device performs software-based SSL/TLS decryption. An attacker could exploit this vulnerability by sending a crafted SSL/TLS message to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: Datagram TLS (DTLS) messages cannot be used to exploit this vulnerability.

The cat6000-dot1x component in Cisco IOS 12.2 before 12.2(33)SXI7 does not properly handle an external loop between a pair of dot1x enabled ports, which allows remote attackers to cause a denial of service (traffic storm) via unspecified vectors that trigger many unicast EAPoL Protocol Data Units (PDUs), aka Bug ID CSCtq36336.

The Cisco Optical Service Module (OSM) for the Catalyst 6500 and 7600 series running Cisco IOS 12.1(8)E through 12.1(13.4)E allows remote attackers to cause a denial of service (hang) via a malformed packet.

Cisco IOS 11.x and 12.0 through 12.2 allows remote attackers to cause a denial of service (traffic block) by sending a particular sequence of IPv4 packets to an interface on the device, causing the input queue on that interface to be marked as full.

Cisco Adaptive Security Appliances (ASA) 5500 series devices with software before 8.2(3) do not properly handle Online Certificate Status Protocol (OCSP) connection failures, which allows remote OCSP responders to cause a denial of service (TCP socket exhaustion) by rejecting connection attempts, aka Bug ID CSCsz36816.

Unspecified vulnerability in the SunRPC inspection feature on the Cisco Firewall Services Module (FWSM) with software 3.1 before 3.1(17.2), 3.2 before 3.2(16.1), 4.0 before 4.0(10.1), and 4.1 before 4.1(1.1) for Catalyst 6500 series switches and 7600 series routers allows remote attackers to cause a denial of service (device reload) via crafted SunRPC messages, aka Bug ID CSCte61622.

Cisco IOS 15.1(2)T allows remote attackers to cause a denial of service (resource consumption and TCP outage) via spoofed TCP packets, related to embryonic TCP connections that remain in the SYN_RCVD or SYN_SENT state, aka Bug ID CSCti18193.

The Presence Engine (PE) service in Cisco Unified Presence 6.x before 6.0(7) and 7.x before 7.0(8) does not properly handle an erroneous Contact field in the header of a SIP SUBSCRIBE message, which allows remote attackers to cause a denial of service (process failure) via a malformed message, aka Bug ID CSCtd39629.

The SIP implementation on the Cisco PGW 2200 Softswitch with software before 9.8(1)S5 allows remote attackers to cause a denial of service (device crash) via a malformed header, aka Bug ID CSCsz13590.

The SIP implementation on the Cisco PGW 2200 Softswitch with software 9.7(3)S before 9.7(3)S9 and 9.7(3)P before 9.7(3)P9 allows remote attackers to cause a denial of service (device crash) via a malformed header, aka Bug ID CSCsk04588.

The SIP implementation on the Cisco PGW 2200 Softswitch with software 9.7(3)S before 9.7(3)S11 and 9.7(3)P before 9.7(3)P11 allows remote attackers to cause a denial of service (device crash) via a long message, aka Bug ID CSCsk44115.

The SIP implementation on the Cisco PGW 2200 Softswitch with software 9.7(3)S before 9.7(3)S9 and 9.7(3)P before 9.7(3)P9 allows remote attackers to cause a denial of service (device crash) via a malformed Contact header, aka Bug ID CSCsj98521.

The SIP implementation on the Cisco PGW 2200 Softswitch with software before 9.7(3)S11 allows remote attackers to cause a denial of service (device crash) via a malformed packet, aka Bug ID CSCsk32606.

The MGCP implementation on the Cisco PGW 2200 Softswitch with software before 9.7(3)S11 allows remote attackers to cause a denial of service (device crash) via a malformed packet, aka Bug ID CSCsl39126.

The SIP implementation on the Cisco PGW 2200 Softswitch with software before 9.7(3)S10 allows remote attackers to cause a denial of service (device crash) via a malformed session attribute, aka Bug ID CSCsk40030.

Cisco IOS before 15.0(1)XA does not properly handle IRC traffic during a specific time period after an initial reload, which allows remote attackers to cause a denial of service (device reload) via an attempted connection to a certain IRC server, related to a "corrupted magic value," aka Bug ID CSCso05336.

Cisco Adaptive Security Appliances (ASA) 5580 series devices with software before 8.1(2) allow remote attackers to cause a denial of service (traceback) via malformed TCP packets, aka Bug ID CSCsm84110.

Cisco Adaptive Security Appliances (ASA) 5580 series devices with software before 8.1(2) allow remote attackers to cause a denial of service (IKE process hang) via malformed NAT-T packets, aka Bug ID CSCsr74439.

A vulnerability in the email message filtering feature of Cisco AsyncOS Software for the Cisco Email Security Appliance could allow an unauthenticated, remote attacker to cause an affected device to run out of memory and stop scanning and forwarding email messages. When system memory is depleted, it can cause the filtering process to crash, resulting in a denial of service (DoS) condition on the device. This vulnerability affects software version 9.0 through the first fixed release of Cisco AsyncOS Software for Cisco Email Security Appliances, both virtual and hardware appliances, if the software is configured to apply a message filter or content filter to incoming email attachments. The vulnerability is not limited to any specific rules or actions for a message filter or content filter. Cisco Bug IDs: CSCvd29354.

A vulnerability in the implementation of the direct authentication feature in Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause an affected device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to incomplete input validation of the HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to the local IP address of an affected device. A successful exploit could allow the attacker to cause the affected device to reload. This vulnerability affects Cisco Adaptive Security Appliance (ASA) Software that is running on the following Cisco products: ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, ASA 1000V Cloud Firewall, Adaptive Security Virtual Appliance (ASAv), Firepower 4110 Security Appliance, Firepower 9300 ASA Security Module, ISA 3000 Industrial Security Appliance. Cisco Bug IDs: CSCvd59063.

Cisco Unified Communications Manager 4.1 before 4.1(3)SR7, 4.2 before 4.2(3)SR4, 4.3 before 4.3(2), 5.x before 5.1(3), and 6.x before 6.1(1) does not properly validate SIP URLs, which allows remote attackers to cause a denial of service (service interruption) via a SIP INVITE message, aka Bug ID CSCsl22355.

Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the improper parsing of crafted CIP packets destined to an affected device. An attacker could exploit these vulnerabilities by sending crafted CIP packets to be processed by an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCuz95334.

The SNMP Trap Agent service in Cisco Unified Communications Manager (CUCM) 4.1 before 4.1(3)SR6, 4.2 before 4.2(3)SR3, 4.3 before 4.3(2), 5.x before 5.1(3), and 6.x before 6.1(1) allows remote attackers to cause a denial of service (core dump and service restart) via a series of malformed UDP packets, as demonstrated by the IP Stack Integrity Checker (ISIC), aka Bug ID CSCsj24113.