Crafted TCP Packet Can Cause Denial of Service

The Cisco IOS Transmission Control Protocol TCP listener in certain versions of Cisco IOS software is vulnerable to a remotely-exploitable memory leak that may lead to a denial of service condition. This vulnerability only applies to traffic destined to the Cisco IOS device. Traffic transiting th...

Cisco IOS Software Multiple Features IP Sockets Vulnerability

A vulnerability in the handling of IP sockets can cause devices to be vulnerable to a denial of service attack when any of several features of Cisco IOS Software are enabled. A sequence of specially crafted TCP/IP packets could cause any of the following results: Cisco has released free software...

Cisco Unified Communications Manager Express Denial of Service Vulnerabilities (cisco-sa-20100324-cucme)

Devices running Cisco IOS Software and configured for Cisco Unified Communications Manager Express CME or Cisco Unified Survivable Remote Site Telephony SRST operation are affected by two denial of service vulnerabilities that may result in a device reload if successfully exploited. The...

Vulnerability in Cisco IOS with OSPF, MPLS VPN, and Supervisor 32, Supervisor 720, or Route Switch Processor 720

Certain Cisco Catalyst 6500 Series and Cisco 7600 Router devices that run branches of Cisco IOS based on 12.2 can be vulnerable to a denial of service vulnerability that can prevent any traffic from entering an affected interface. For a device to be vulnerable, it must be configured for Open...

Cisco IOS Virtual Private Dial-up Network Denial of Service Vulnerability - Cisco Systems

Two vulnerabilities exist in the virtual private dial-up network VPDN solution when Point-to-Point Tunneling Protocol PPTP is used in certain Cisco IOS releases prior to 12.3. PPTP is only one of the supported tunneling protocols used to tunnel PPP frames within the VPDN solution. The first...

Voice Vulnerabilities in Cisco IOS and Cisco Unified Communications Manager - Cisco Systems

Multiple voice-related vulnerabilities are identified in Cisco IOS software, one of which is also shared with Cisco Unified Communications Manager. These vulnerabilities pertain to the following protocols or features: - Session Initiation Protocol SIP - Media Gateway Control Protocol MGCP -...

Cable Modem Termination System Authentication Bypass - Cisco Systems

Two issues are described in this security advisory. The first issue involves cable modems not manufactured by Cisco that allow a configuration file to be downloaded from an interface that is not connected to the network of the cable modem's service provider. This historical behavior allows an...

Cisco IOS IPS Denial of Service Vulnerability - Cisco Systems

The Cisco IOS Intrusion Prevention System IPS feature contains a vulnerability in the processing of certain IPS signatures that use the SERVICE.DNS engine. This vulnerability may cause a router to crash or hang, resulting in a denial of service condition. Cisco has released free software updates...

Multiple Vulnerabilities in the IOS FTP Server

The Cisco IOS FTP Server feature contains multiple vulnerabilities that can result in a denial of service DoS condition, improper verification of user credentials, and the ability to retrieve or write any file from the device filesystem, including the device's saved configuration. This...

Multiple IOS IPS Vulnerabilities

The Intrusion Prevention System IPS feature set of Cisco IOS contains several vulnerabilities. These include: - Fragmented IP packets may be used to evade signature inspection. CVE-2007-0917 - IPS signatures utilizing the regular expression feature of the ATOMIC.TCP signature engine may cause a...

Cisco IOS Software Network Time Protocol Packet Vulnerability - Cisco Systems

Cisco IOS Software with support for Network Time Protocol NTP version v4 contains a vulnerability processing specific NTP packets that will result in a reload of the device. This results in a remote denial of service DoS condition on the affected device. Cisco has released free software updates...

Cisco IOS Software Crafted Encryption Packet Denial of Service Vulnerability - Cisco Systems

Cisco IOS Software contains a vulnerability that could allow an attacker to cause a Cisco IOS device to reload by remotely sending a crafted encryption packet. Cisco has released free software updates that address this vulnerability. TRUSTED...

RADIUS Authentication Bypass (cisco-sa-20050629-aaa)

Remote Authentication Dial In User Service RADIUS authentication on a device that is running certain versions of Cisco Internetworking Operating System IOS and configured with a fallback method to none can be bypassed. Systems that are configured for other authentication methods or that are not...

Vulnerabilities in H.323 Message Processing - Cisco Systems

Multiple Cisco products contain vulnerabilities in the processing of H.323 messages, which are typically used in Voice over Internet Protocol VoIP or multimedia applications. A test suite has been developed by the University of Oulu to target this protocol and identify vulnerabilities. Support fo...

Cisco IOS Software Session Initiation Protocol Denial of Service Vulnerability (cisco-sa-20090923-sip)

A vulnerability exists in the Session Initiation Protocol SIP implementation in Cisco IOS Software that could allow an unauthenticated attacker to cause a denial of service DoS condition on an affected device when the Cisco Unified Border Element feature is enabled. Cisco has released free softwa...

Information Leakage Using IPv6 Routing Header in Cisco IOS and Cisco IOS XR - Cisco Systems

Cisco IOS and Cisco IOS XR contain a vulnerability when processing specially crafted IPv6 packets with a Type 0 Routing Header present. Exploitation of this vulnerability can lead to information leakage on affected IOS and IOS XR devices, and may also result in a crash of the affected IOS device...

IPv6 Routing Header Vulnerability

Processing a specially crafted IPv6 Type 0 Routing header can crash a device running Cisco IOS software. This vulnerability does not affect IPv6 Type 2 Routing headers which are used in mobile IPv6. IPv6 is not enabled by default in Cisco IOS. Cisco has made free software available to address thi...

DLSw Vulnerability - Cisco Systems

A vulnerability exists in the Data-link Switching DLSw feature in Cisco IOS where an invalid value in a DLSw message could result in a reload of the DLSw device. Successful exploitation of this vulnerability requires that an attacker be able to establish a DLSw connection to the device. There are...

Cisco IOS Software Multiple Features Crafted UDP Packet Vulnerability - Cisco Systems

Several features within Cisco IOS Software are affected by a crafted UDP packet vulnerability. If any of the affected features are enabled, a successful attack will result in a blocked input queue on the inbound interface. Only crafted UDP packets destined for the device could result in the...

Cisco IOS ARP Table Overwrite Vulnerability - Cisco Systems

It is possible to send an Address Resolution Protocol ARP packet on a local broadcast interface for example, Ethernet, cable, Token Ring, FDDI which could cause a router or switch running specific versions of Cisco IOS Software Release to stop sending and receiving ARP packets on the local router...