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Recent Security Notices
03-Feb-2026 Field Notice: FN74350 - Cisco Unified Border Element: Impact on Secure Communication Due to Upcoming Changes to TLS Certificates Issued by Public Certificate Authorities with Client Authentication EKU, Starting May 2026 - Workaround Provided
20-Jan-2026 Field Notice: FN72510 - Cisco IOS XE Software: Weak Cryptographic Algorithms Are Not Allowed by Default for IPsec Configuration in Certain Cisco IOS XE Software Releases - Configuration Change Recommended
16-Oct-2025 Field Notice: FN74260 - Cisco Catalyst 9400 Switches Supervisor Modules Can Experience Memory Failures - Hardware Upgrade Available
07-Dec-2023 Field Notice: FN72524 - During Software Upgrade/Downgrade, Cisco IOS APs Might Remain in Downloading State After December 4, 2022 Due to Certificate Expiration - Software Upgrade Recommended
Document Categories
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Data Sheets and Product Information
Design
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Literature
Maintain and Operate
Reference
Security Notices
Troubleshooting
See also: Translated End-User Guides
Data Sheets and Product Information
Data Sheets
Cisco ASR 1000 Series Embedded Services Processors Data Sheet 29-Jun-2021
Cisco Catalyst 6800 Series Supervisor Engine 6T Data Sheet 15-Apr-2019
Cisco Catalyst 6500/Cisco 7600 Series Supervisor Engine 720 Data Sheet 14-Jan-2019
Cisco Wide Area Application Services on Cisco Services Ready Engine Modules for Cisco Integrated Services Routers Generation 2 14-Jan-2019
Cisco Catalyst 4500E Supervisor Engine 8L-E: Enhanced Campus Access and Aggregation Supervisor Engine Data Sheet 08-Jan-2018
Cisco Catalyst 6500 Series Supervisor Engine 2T Data Sheet 30-May-2017
Cisco Catalyst 6500 Series 10/100- & 10/100/1000-MBPS Ethernet Interface Modules Data Sheet 14-Jan-2016
Cisco Catalyst 4500 Series Supervisor Engine II-Plus 07-Oct-2015
Catalyst 4500E Supervisor Engine 7-E: Leading Borderless Network Access and Aggregation Supervisor Engine Data Sheet 13-Mar-2015
Cisco IP VSAT Satellite WAN Network Module for Cisco Integrated Services Routers 13-Mar-2015
Cisco 4500 Series Supervisor Engine II-Plus-TS for 4503-E and 4503 Switches 13-Mar-2015
T3/E3 ATM Network Modules for Cisco 2800, 3800 and 3900 Integrated Services Routers 13-Mar-2015
Cisco Channelized T1/E1 and ISDN PRI Modules for the Integrated Services Routers Data Sheet 18-Aug-2014
Cisco Unified SIP Proxy Version 9.0 Data Sheet 07-Jan-2014
Cisco 3800 and 3900 Series ATM OC-3 Network Module 02-Jan-2014
View all documentation of this type
End-of-Life and End-of-Sale Notices
End-of-Sale and End-of-Life Announcement for the Cisco Select WAN interface modules including Multimode G.SHDSL, VDSL2, ADSL2/2+ and Select Serial WAN interfaces 30-Jan-2026new
End-of-Sale and End-of-Life Announcement for the Cisco Switch module for Modular Platforms 23-Jan-2025
End-of-Sale and End-of-Life Announcement for the Cisco LAN Switch Network Interface Modules (NIMs) 05-Dec-2024
End-of-Sale and End-of-Life Announcement for the Cisco Select ISR G1/G2 Software Products 07-May-2021
End-of-Sale and End-of-Life Announcement for the Cisco SM-X-ES Switching Modules 16-Dec-2020
End-of-Sale and End-of-Life Announcement for the Cisco Layer 3 Switch Module and Licenses 10-Nov-2020
End-of-Sale and End-of-Life Announcement for the Cisco Select Layer 2 and Layer 3 Ether Switch Modules for ISR G2 04-May-2020
End-of-Sale and End-of-Life Announcement for the Cisco HWIC, EHWIC and SM Modules for ISR G2 Routers 24-Aug-2018
End-of-Sale and End-of-Life Announcement for the Cisco 1-Port 100BASE-FX Fast Ethernet Network Module Version 2 09-Aug-2017
End-of-Sale and End-of-Life Announcement for the Cisco CAB-X21 Cable 28-Jun-2017
End-of-Sale and End-of-Life Announcement for the 36 Port Cisco Ethernet Switching Network Modules 13-Mar-2015
EOL/EOS for the Cisco Digital T1, E1 and J1 Packet Voice Trunk Network Modules 13-Mar-2015
End-of-Life Announcement of the WS-X5113 13-Mar-2015
End Of Life of Catalyst 5000 ATM LAN Emulation Module 13-Mar-2015
EOS and EOL Announcement for the 16-Port 10/100 Ethernet Modules and Gigabit Ethernet Daughter Card for Cisco 2600/2800/2900/3600/3700/3800/3900 Series Routers 13-Mar-2015
View all documentation of this type
Security Notices
Field Notices
Applicable to Multiple Models
Field Notice: FN74350 - Cisco Unified Border Element: Impact on Secure Communication Due to Upcoming Changes to TLS Certificates Issued by Public Certificate Authorities with Client Authentication EKU, Starting May 2026 - Workaround Provided 03-Feb-2026new
Field Notice: FN72510 - Cisco IOS XE Software: Weak Cryptographic Algorithms Are Not Allowed by Default for IPsec Configuration in Certain Cisco IOS XE Software Releases - Configuration Change Recommended 20-Jan-2026updated
Field Notice: FN74260 - Cisco Catalyst 9400 Switches Supervisor Modules Can Experience Memory Failures - Hardware Upgrade Available 16-Oct-2025
Field Notice: FN72524 - During Software Upgrade/Downgrade, Cisco IOS APs Might Remain in Downloading State After December 4, 2022 Due to Certificate Expiration - Software Upgrade Recommended 07-Dec-2023
Field Notice: FN - 63764 - Some ASR1000 Products Might Fail to Boot Up After a Power Cycle - Replace on Failure 10-Sep-2018
Field Notice: FN - 63743 - Catalyst 6500 - Might Fail to Boot Up After a Software Upgrade or Power Cycle - Replace on Failure 23-Aug-2018
Field Notice: FN - 63762 - EHWIC-3G-XXX, EMV-IPVS-16A, HWIC-3G-XXX, NME-XXX, and SM-XXX Might Fail to Boot After a Power Cycle - Replace on Failure 23-Aug-2018
Field Notice: FN - 63975 - Nexus 7000 Supervisor 2 and 2E Embedded Flash Write Error - Software Upgrade Recommended 13-Feb-2018
Cisco 2600/3600/3700 Series T3/E3 Network Module
Field Notice: Interface Renumbering May Occur After IOS Upgrade to 12.3(6) or 12.3(2)T and Subsequent Releases With a Combination of DSL WIC's and Other WIC's or VWIC's Installed in the Same Chassis 21-Mar-2005
Cisco Catalyst 9400 Supervisor Engine-1
Field Notice: FN - 70597 - Limited Number of C9400-SSD-960GB/C9K-F2-SSD-960GB SSDs Will Fail After 1700 Hours of Cumulative Idle Time - BIOS/Firmware Upgrade Recommended 07-Oct-2020
Cisco Catalyst 4500 Series Supervisor Engine V-10GE
Field Notice: FN - 63746 - Catalyst C4500 and Catalyst 49xx Might Fail to Boot Up After a Software Upgrade or Power Cycle - Replace on Failure 10-Sep-2018
Cisco Catalyst 3650 Stack Module
Field Notice: FN - 63949 - Cisco Catalyst 3650 T2 Series Stack Cable Might Cause Intermittent Link Failures - Replace on Failure 25-Jan-2018
Cisco Distributed Forwarding Card
Field Notice: FN - 63866 - Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers TCAM Exhaustion - Configuration Change Recommended 20-Aug-2014
Cisco MGX 8850 PXM-45 Processor Switch Module
Field Notice: FN - 63774 - MGX Cards Might Fail to Boot Up After a Software Upgrade or Power Cycle - Replace on Failure 20-Sep-2018
Cisco Nexus 7000 Series Supervisor 2E Module
Field Notice: FN - 64154 - Nexus 7700 Supervisor 2E Embedded Flash Write Error - Software Upgrade Recommended 15-Jan-2018
Cisco WDM Modules
Field Notice: FN - 70114 - ONS-CFP2-WDM Units Might Have a Frequency Error on One Specific Channel - Replace on Failure 19-Jul-2023
Field Notice: FN - 70468 - Firmware Downgrade of CFP2 Modules Will Result in Rx LOS Alarm - Downgrade Is Not Recommended - Workaround Provided 10-Feb-2020
Security Advisories, Responses and Notices
Multiple Vulnerabilities in OpenSSL Affecting Cisco Products: September 2016 02-Jan-2019