Products & Services

Training & Events

Partner Central

Hierarchical Navigation

HOME
- SUPPORT
  - PRODUCT SUPPORT
    - END-OF-SALE AND END-OF-LIFE PRODUCTS
      - CISCO IOS SOFTWARE RELEASES 12.1 SPECIAL AND EARLY DEPLOYMENTS
        TROUBLESHOOT AND ALERTS
        Field Notices
        Security Advisories, Responses and Notices
        Troubleshooting TechNotes

Cisco IOS Software Releases 12.1 Special and Early Deployments

Security Advisories, Responses and Notices

Some links below may open a new browser window () to display the document you selected.

View documents by topics:

Cisco IOS Software Release 12.1(10)EV
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
Cisco IOS Software Release 12.1(10)EX
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
Cisco IOS Software Release 12.1(5)XM
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
- Cisco Security Advisory: Cisco IOS PPTP Vulnerability
  13/Sep/2001
Cisco IOS Software Release 12.1(5)XR
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(5)XU
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(5)XV
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
- Cisco Security Advisory: Cisco IOS PPTP Vulnerability
  13/Sep/2001
Cisco IOS Software Release 12.1(5)YA
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
- Cisco Security Advisory: Cisco IOS PPTP Vulnerability
  13/Sep/2001
Cisco IOS Software Release 12.1(5)YB
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
- Cisco Security Advisory: Cisco IOS PPTP Vulnerability
  13/Sep/2001
Cisco IOS Software Release 12.1(5)YC
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
- Cisco Security Advisory: Cisco IOS PPTP Vulnerability
  13/Sep/2001
Cisco IOS Software Release 12.1(5)YD
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
- Cisco Security Advisory: Cisco IOS PPTP Vulnerability
  13/Sep/2001
Cisco IOS Software Release 12.1(5)YE
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(5)YH
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(3)XG
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(3)XI
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(3)XJ
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(3)XL
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(3)XP
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(3)XQ
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(3)XT
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(2)XH
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(1)XA
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(1)XB
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Release 12.1(1)XC
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
Cisco IOS Software Releases 12.1 AA
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
Cisco IOS Software Releases 12.1 DA
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
Cisco IOS Software Releases 12.1 DB
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
Cisco IOS Software Releases 12.1 DC
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
Cisco IOS Software Releases 12.1 EC
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Vulnerabilities in Cisco IOS Secure Shell Server
  03/May/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
Cisco IOS Software Releases 12.1 EX
- Cisco Security Response: Making Unidirectional VLAN and PVLAN Jumping Bidirectional
  17/Jun/2008
- Cisco Security Advisory: IOS Heap-based Overflow Vulnerability in System Timers
  04/Nov/2005
- Cisco Security Advisory: Cisco Telnet Denial of Service Vulnerability
  31/Dec/2004
- Cisco Security Notice: W32.BLASTER Worm Mitigation Recommendations
  19/Jul/2004
- Cisco Security Advisory: Cisco IOS Software Processing of SAA Packets
  12/Dec/2003
- Cisco Security Notice: Enumerating Locally Defined Users in Cisco IOS
  24/Jul/2003
- Cisco Security Advisory: MS SQL Worm Mitigation Recommendations
  13/Feb/2003
- Cisco Security Notice: Response to BugTraq - show Command Vulnerability
  09/May/2000
- Rootkits on Cisco IOS Devices
  12/Nov/2009
- Cisco Security Advisory: Transport Layer Security Renegotiation Vulnerability New!
  09/Nov/2009
- Cisco Security Advisory: Cisco IOS Software Multiple Features IP Sockets Vulnerability
  25/Jun/2009
- Cisco Security Response: Cisco IOS Line Printer Daemon (LPD) Protocol Stack Overflow
  09/Oct/2007
- Cisco Security Advisory: Crafted ICMP Messages Can Cause Denial of Service
  27/Apr/2005