High Threat Security Alert (A26-08-17): Vulnerability in Cisco Products

Description:

Cisco has released a security update to address a vulnerability in Cisco devices and software. For information about the vulnerability and the attacking vector, please refer to the corresponding security advisory at the vendor's website.

Reports indicated that a denial of service vulnerability (CVE-2026-20349) is being exploited in the wild. System administrators are advised to take immediate action to patch your affected systems to mitigate the elevated risk of cyber attacks.

Affected Systems:

• Cisco Secure Firewall Adaptive Security Appliance Software
• Cisco Secure Firewall Threat Defense Software

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

Impact:

Successful exploitation of the vulnerability could lead to denial of service 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-asaftd-vpn-dos-dzv4mQFF
• https://www.hkcert.org/security-bulletin/cisco-products-multiple-vulnerabilities_20260812
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20349