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Cisco 4000 Series Integrated Services Routers
Field Notices
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Cisco 4461 Integrated Services Router
Cisco 4451-X Integrated Services Router
Cisco 4431 Integrated Services Router
Cisco 4351 Integrated Services Router
Cisco 4331 Integrated Services Router
Cisco 4321 Integrated Services Router
Cisco 4221 Integrated Services Router
Cisco 4461 Integrated Services Router
Field Notice: FN74146 - Limited Number of Cisco Catalyst Routers Can Experience Memory Failures - Hardware Upgrade Available
02/Oct/2024
Updated
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
10/Jan/2024
Field Notice: FN72323 - Cisco IOS XE Software: QuoVadis Root CA 2 Decommission Might Affect Smart Licensing, Smart Call Home, and Other Functionality - Software Upgrade Recommended
05/Oct/2023
Field Notice: FN72578 - Cisco IOS XE - Smart Licensing Using Policy Might Cause High CPU/Memory Usage - Software Upgrade Recommended
29/Sep/2023
Field Notice: FN - 72265 - Expired PKI Certificate on vEdge, ISR, and ASR Routers Causes SD-WAN Umbrella DNS Connections to Fail - Software Upgrade Recommended
23/Nov/2021
Cisco 4451-X Integrated Services Router
Field Notice: FN74146 - Limited Number of Cisco Catalyst Routers Can Experience Memory Failures - Hardware Upgrade Available
02/Oct/2024
Updated
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
10/Jan/2024
Field Notice: FN72323 - Cisco IOS XE Software: QuoVadis Root CA 2 Decommission Might Affect Smart Licensing, Smart Call Home, and Other Functionality - Software Upgrade Recommended
05/Oct/2023
Field Notice: FN72578 - Cisco IOS XE - Smart Licensing Using Policy Might Cause High CPU/Memory Usage - Software Upgrade Recommended
29/Sep/2023
Field Notice: FN - 72265 - Expired PKI Certificate on vEdge, ISR, and ASR Routers Causes SD-WAN Umbrella DNS Connections to Fail - Software Upgrade Recommended
23/Nov/2021
Field Notice: FN - 64153 - ASR1000 - Inaccurate Power Supply Unit Status - Software Upgrade Recommended
27/May/2020
Field Notice: FN - 63938 - ISR4451X/K9 & ISR4431/K9 - Silent "PowerON" Reload - CPLD Update Required - Software Upgrade Recommended
26/Oct/2017
Field Notice: FN - 64190 - Cisco IOS XE - Show commands on Cisco IOS XE based platforms might not report true platform memory usage - Software Upgrade Recommended
07/Oct/2016
Cisco 4431 Integrated Services Router
Field Notice: FN74118 - Some PWR-CC1-500WAC Power Supplies May Show Incorrect Power Readings in Cisco IOS XE Software, Resulting in Incorrect Fan Speed Control - Hardware Upgrade Available
01/May/2024
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
10/Jan/2024
Field Notice: FN72323 - Cisco IOS XE Software: QuoVadis Root CA 2 Decommission Might Affect Smart Licensing, Smart Call Home, and Other Functionality - Software Upgrade Recommended
05/Oct/2023
Field Notice: FN72578 - Cisco IOS XE - Smart Licensing Using Policy Might Cause High CPU/Memory Usage - Software Upgrade Recommended
29/Sep/2023
Field Notice: FN - 72265 - Expired PKI Certificate on vEdge, ISR, and ASR Routers Causes SD-WAN Umbrella DNS Connections to Fail - Software Upgrade Recommended
23/Nov/2021
Field Notice: FN - 64153 - ASR1000 - Inaccurate Power Supply Unit Status - Software Upgrade Recommended
27/May/2020
Field Notice: FN - 64190 - Cisco IOS XE - Show commands on Cisco IOS XE based platforms might not report true platform memory usage - Software Upgrade Recommended
07/Oct/2016
Cisco 4351 Integrated Services Router
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
10/Jan/2024
Field Notice: FN72323 - Cisco IOS XE Software: QuoVadis Root CA 2 Decommission Might Affect Smart Licensing, Smart Call Home, and Other Functionality - Software Upgrade Recommended
05/Oct/2023
Field Notice: FN72578 - Cisco IOS XE - Smart Licensing Using Policy Might Cause High CPU/Memory Usage - Software Upgrade Recommended
29/Sep/2023
Field Notice: FN - 72265 - Expired PKI Certificate on vEdge, ISR, and ASR Routers Causes SD-WAN Umbrella DNS Connections to Fail - Software Upgrade Recommended
23/Nov/2021
Field Notice: FN - 64153 - ASR1000 - Inaccurate Power Supply Unit Status - Software Upgrade Recommended
27/May/2020
Field Notice: FN - 64253 - ISR4331, ISR4321, ISR4351 and UCS-E120 Might Fail After 18 Months or Longer Due to Clock Signal Component Failure - Replace on Failure
17/Oct/2019
Field Notice: FN - 63938 - ISR4451X/K9 & ISR4431/K9 - Silent "PowerON" Reload - CPLD Update Required - Software Upgrade Recommended
26/Oct/2017
Field Notice: FN - 64190 - Cisco IOS XE - Show commands on Cisco IOS XE based platforms might not report true platform memory usage - Software Upgrade Recommended
07/Oct/2016
Cisco 4331 Integrated Services Router
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
10/Jan/2024
Field Notice: FN72323 - Cisco IOS XE Software: QuoVadis Root CA 2 Decommission Might Affect Smart Licensing, Smart Call Home, and Other Functionality - Software Upgrade Recommended
05/Oct/2023
Field Notice: FN72578 - Cisco IOS XE - Smart Licensing Using Policy Might Cause High CPU/Memory Usage - Software Upgrade Recommended
29/Sep/2023
Field Notice: FN - 72265 - Expired PKI Certificate on vEdge, ISR, and ASR Routers Causes SD-WAN Umbrella DNS Connections to Fail - Software Upgrade Recommended
23/Nov/2021
Field Notice: FN - 70573 - Cisco Secure Unique Device Identifier Certificate Expiration Impact On Internet of Things Products Managed by Cisco Field Network Director - Workaround Provided
16/Oct/2020
Field Notice: FN - 64153 - ASR1000 - Inaccurate Power Supply Unit Status - Software Upgrade Recommended
27/May/2020
Field Notice: FN - 64253 - ISR4331, ISR4321, ISR4351 and UCS-E120 Might Fail After 18 Months or Longer Due to Clock Signal Component Failure - Replace on Failure
17/Oct/2019
Field Notice: FN - 63938 - ISR4451X/K9 & ISR4431/K9 - Silent "PowerON" Reload - CPLD Update Required - Software Upgrade Recommended
26/Oct/2017
Field Notice: FN - 64190 - Cisco IOS XE - Show commands on Cisco IOS XE based platforms might not report true platform memory usage - Software Upgrade Recommended
07/Oct/2016
Cisco 4321 Integrated Services Router
Field Notice: FN74073 - Some Cisco PWR4320 Power Supply Units May Experience Component Failure - Hardware Upgrade Available
15/May/2024
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
10/Jan/2024
Field Notice: FN72323 - Cisco IOS XE Software: QuoVadis Root CA 2 Decommission Might Affect Smart Licensing, Smart Call Home, and Other Functionality - Software Upgrade Recommended
05/Oct/2023
Field Notice: FN72578 - Cisco IOS XE - Smart Licensing Using Policy Might Cause High CPU/Memory Usage - Software Upgrade Recommended
29/Sep/2023
Field Notice: FN - 72265 - Expired PKI Certificate on vEdge, ISR, and ASR Routers Causes SD-WAN Umbrella DNS Connections to Fail - Software Upgrade Recommended
23/Nov/2021
Field Notice: FN - 64153 - ASR1000 - Inaccurate Power Supply Unit Status - Software Upgrade Recommended
27/May/2020
Field Notice: FN - 64253 - ISR4331, ISR4321, ISR4351 and UCS-E120 Might Fail After 18 Months or Longer Due to Clock Signal Component Failure - Replace on Failure
17/Oct/2019
Field Notice: FN - 64190 - Cisco IOS XE - Show commands on Cisco IOS XE based platforms might not report true platform memory usage - Software Upgrade Recommended
07/Oct/2016
Cisco 4221 Integrated Services Router
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
10/Jan/2024
Field Notice: FN72323 - Cisco IOS XE Software: QuoVadis Root CA 2 Decommission Might Affect Smart Licensing, Smart Call Home, and Other Functionality - Software Upgrade Recommended
05/Oct/2023
Field Notice: FN72578 - Cisco IOS XE - Smart Licensing Using Policy Might Cause High CPU/Memory Usage - Software Upgrade Recommended
29/Sep/2023
Field Notice: FN - 72265 - Expired PKI Certificate on vEdge, ISR, and ASR Routers Causes SD-WAN Umbrella DNS Connections to Fail - Software Upgrade Recommended
23/Nov/2021
Field Notice: FN - 64321 - Network Interface Module Functionality Issue with Cisco IOS Releases Earlier than IOS-XE 16.5 - Software Upgrade Recommended
17/Jul/2017
Support Documentation
All Support Documentation for this Series
Security Notices
Security Advisories, Responses and Notices
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