SB2026081227 - Remote denial of service in Cisco ASA and Cisco FTD

Description

This security bulletin contains information about 1 vulnerability.

1) Heap Inspection (CVE-ID: CVE-2026-20349) Exploited

CWE-ID: CWE-244 - Improper Clearing of Heap Memory Before Release ('Heap Inspection')

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to insufficient error checking in the Remote Access SSL VPN service when processing HTTP requests. A remote attacker can send a crafted HTTP request to cause a denial of service.

The issue can cause the affected device to reload unexpectedly.

Note, the vulnerability is being exploited in the wild. 

Remediation

Install update from vendor's website.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-dzv4mQFF
• https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwv96220