Ref# ADV2026_149 | Date: Mar 11th 2026

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Cisco published a security advisory highlighting vulnerabilities in the following products on March 11th, 2026. It is recommended that you take the necessary precautions by ensuring your products are always updated. 

• Cisco NCS 5700 Series line cards – multiple versions 

• Cisco NCS 5700 Series Fixed Chassis – multiple versions 

• Cisco IOS XR Software – multiple versions 

• Cisco Unified Intelligence Center – all versions 

• Cisco Finesse – all versions 

• Cisco Packaged CCE – all versions 

• Cisco Unified CCE – all versions 

• Cisco Unified CCX – all versions 

 

For more information on these updates, you can follow these URLs: 

• Cisco IOS XR Egress Packet Network Interface Aligner Interrupt Denial of Service Vulnerability 

• Cisco IOS XR Software Multi-Instance Intermediate System-to-Intermediate System Denial of Service Vulnerability 

• Cisco IOS XR Software CLI Privilege Escalation Vulnerabilities 

• Multiple Cisco Contact Center Products Cross-Site Scripting Vulnerabilities 

• Cisco Security Advisories 

 

The Guyana National CIRT recommends that users and administrators review these updates and apply them where necessary. 

 PDF Download: Cisco_Security_Advisory

References 

• Cisco IOS XR Egress Packet Network Interface Aligner Interrupt Denial of Service Vulnerability. (n.b.). Retrieved from Cisco. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xrncs-epni-int-dos-TWMffUsN 

 

• Cisco IOS XR Software Multi-Instance Intermediate System-to-Intermediate System Denial of Service Vulnerability. (n.b.). Retrieved from Cisco. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-privesc-bF8D5U4Whttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-isis-dos-kDMxpSzK 

 

• Cisco IOS XR Software CLI Privilege Escalation Vulnerabilities. (n.b.). Retrieved from Cisco. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-privesc-bF8D5U4W 

 

• Multiple Cisco Contact Center Products Cross-Site Scripting Vulnerabilities. (n.b.). Retrieved from Cisco. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cc-xss-MrNAH5Jh 

 

• Cisco Security Advisories. (n.b). Retrieved from Cisco. https://tools.cisco.com/security/center/publicationListing.x 

 

• Cisco security advisory. (March 11, 2026). Retrieved from Canadian Centre for Cyber Security. https://www.cyberhttps://www.cyber.gc.ca/en/alerts-advisories/cisco-security-advisory-av26-223.gc.ca/en/alerts-advisories