Security Alert (A26-10-39): Multiple Vulnerabilities in Cisco Products


 

Published on: 22 October 2026

Description:

Cisco has released security updates to address multiple vulnerabilities in several Cisco devices and software. For information about the vulnerabilities and the attacking vectors, please refer to the corresponding security advisories at the vendor's website.

 

Affected Systems:

  • Cisco Cloud-delivered Firewall
  • Cisco Cyber Vision
  • Cisco Emergency Responder
  • Cisco Expressway Series
  • Cisco IOS XR 64-bit Software
  • Cisco Meraki MX Security Appliances
  • Cisco Prime Collaboration Deployment
  • Cisco Secure Access
  • Cisco Secure Client Secure Firewall Posture Module
  • Cisco Secure Firewall Threat Defense Software
  • Cisco Unified Communications Manager
  • Cisco Unified Communications Manager IM and Presence Service
  • Cisco Unified Communications Manager Session Management Edition
  • Cisco Unity Connection
  • Open Source Snort 3
  • Unified Threat Defense on Cisco IOS XE Software

For detailed information of the affected products, please refer to the section "Affected Products" of corresponding security advisory at vendor's website.

 

Impact:

Depending on the vulnerabilities exploited, a successful attack could lead to remote code execution, denial of service, elevation of privilege, information disclosure, security restriction bypass or tampering on an affected system.

 

Recommendation:

Software updates for affected systems are now available. System administrators of affected systems should follow the recommendations provided by the product vendor and take immediate actions to mitigate the risk. For detailed information of the available patches, please refer to the section "Fixed Software" of corresponding security advisory at vendor's website.

System administrators should contact their product support vendors for the fixes and assistance.

 

More Information:

  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr9k-tUyxcyXN
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-access-PW9e8Jt2
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-expressway-inf-disc-vvYqgSTS
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-exwy-hardening-FhcqBVcs
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-snort3-ybgmhTQe
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-opensrc-snort3-2fXGJPfe
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-php-october26-Jj384Daq
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sec-client-priv-esc-muF8eZdm
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-gre-JNpMHrTv
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-gtpcodec-dos-Rmecfepz
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-mime-vulns-bkXjcKkt
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-misc-dos-6mB22qAK
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-vba-bufdos-jAuFdvn9
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vcs-static-cred-hr7EWZ8t
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-hardening-twgbH9e3
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20011
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20019
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20043
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20179
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20197
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20218
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20221
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20236
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20291
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20356
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-76435
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-76445
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-76462
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-76466
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-76473 (to CVE-2026-76479)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-76481
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-76487
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-76489 (to CVE-2026-76497)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-76505
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-76524


Tag: Cisco , Cisco Cloud-delivered Firewall , Cisco Cyber Vision , Cisco Emergency Responder , Cisco Expressway Series , Cisco IOS XR , Cisco Meraki , Cisco Prime Collaboration Deployment , Cisco Secure Access , Cisco Secure Client , Cisco Secure Firewall , Cisco Unified Communications Manager , Cisco Unity Connection , Open Source Snort 3 , Cisco IOS XE
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