A vulnerability in the Remote Access SSL VPN functionality of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust device memory resulting in a denial of service (DoS) condition to new Remote Access SSL VPN connections. This does not affect the management interface, though it may become temporarily unresponsive.

This vulnerability is due to trusting user input without validation. An attacker could exploit this vulnerability by sending crafted packets to the Remote Access SSL VPN server. A successful exploit could allow the attacker to cause the device web interface to stop responding, resulting in a DoS condition.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software affected
Version Status Constraints
9.12.4.48 affected —
9.12.4.50 affected —
9.12.4.52 affected —
9.12.4.54 affected —
9.12.4.55 affected —
9.12.4.56 affected —
9.12.4.58 affected —
9.12.4.62 affected —
9.12.4.65 affected —
9.12.4.67 affected —
9.16.3.15 affected —
9.16.3.19 affected —
9.16.3.23 affected —
9.16.4 affected —
9.16.4.9 affected —
9.16.4.14 affected —
9.16.4.19 affected —
9.16.4.27 affected —
9.16.4.38 affected —
9.16.4.39 affected —
9.16.4.42 affected —
9.16.4.48 affected —
9.16.4.55 affected —
9.16.4.57 affected —
9.16.4.61 affected —
9.16.4.62 affected —
9.16.4.67 affected —
9.16.4.70 affected —
9.16.4.71 affected —
9.16.4.76 affected —
9.16.4.82 affected —
9.16.4.84 affected —
9.17.1.20 affected —
9.17.1.30 affected —
9.17.1.33 affected —
9.17.1.39 affected —
9.17.1.45 affected —
9.17.1.46 affected —
9.18.1.3 affected —
9.18.2 affected —
9.18.2.5 affected —
9.18.2.7 affected —
9.18.2.8 affected —
9.18.3 affected —
9.18.3.39 affected —
9.18.3.46 affected —
9.18.3.53 affected —
9.18.3.55 affected —
9.18.3.56 affected —
9.18.4 affected —
9.18.4.5 affected —
9.18.4.8 affected —
9.18.4.22 affected —
9.18.4.24 affected —
9.18.4.29 affected —
9.18.4.34 affected —
9.18.4.40 affected —
9.18.4.47 affected —
9.18.4.50 affected —
9.18.4.52 affected —
9.18.4.53 affected —
9.18.4.57 affected —
9.19.1 affected —
9.19.1.5 affected —
9.19.1.9 affected —
9.19.1.12 affected —
9.19.1.18 affected —
9.19.1.22 affected —
9.19.1.24 affected —
9.19.1.27 affected —
9.19.1.28 affected —
9.19.1.31 affected —
9.19.1.37 affected —
9.19.1.38 affected —
9.19.1.42 affected —
9.20.1 affected —
9.20.1.5 affected —
9.20.2 affected —
9.20.2.10 affected —
9.20.2.21 affected —
9.20.2.22 affected —
9.20.3 affected —
9.20.3.4 affected —
9.20.3.7 affected —
9.20.3.9 affected —
9.20.3.10 affected —
9.20.3.13 affected —
9.20.3.16 affected —
9.20.3.20 affected —
9.22.1.1 affected —
9.22.1.3 affected —
9.22.1.2 affected —
9.22.1.6 affected —
9.22.2 affected —
9.22.2.4 affected —
9.23.1 affected —
9.23.1.3 affected —
Cisco Cisco Secure Firewall Threat Defense (FTD) Software affected
Version Status Constraints
6.4.0.16 affected —
6.4.0.17 affected —
6.4.0.18 affected —
7.0.4 affected —
7.0.5 affected —
7.0.6 affected —
7.0.6.1 affected —
7.0.6.2 affected —
7.0.6.3 affected —
7.0.7 affected —
7.0.8 affected —
7.0.8.1 affected —
7.1.0.3 affected —
7.2.1 affected —
7.2.2 affected —
7.2.3 affected —
7.2.4 affected —
7.2.4.1 affected —
7.2.5 affected —
7.2.5.1 affected —
7.2.6 affected —
7.2.7 affected —
7.2.5.2 affected —
7.2.8 affected —
7.2.8.1 affected —
7.2.9 affected —
7.2.10 affected —
7.2.10.2 affected —
7.3.0 affected —
7.3.1 affected —
7.3.1.1 affected —
7.3.1.2 affected —
7.4.0 affected —
7.4.1 affected —
7.4.1.1 affected —
7.4.2 affected —
7.4.2.1 affected —
7.4.2.2 affected —
7.4.2.3 affected —
7.4.2.4 affected —
7.6.0 affected —
7.6.1 affected —
7.6.2 affected —
7.6.2.1 affected —
7.7.0 affected —
7.7.10 affected —
7.7.10.1 affected —

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC cve-icon cve-icon
History

Wed, 04 Mar 2026 17:30:00 +0000

Type Values Removed Values Added
Description A vulnerability in the Remote Access SSL VPN functionality of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust device memory resulting in a denial of service (DoS) condition to new Remote Access SSL VPN connections. This does not affect the management interface, though it may become temporarily unresponsive. This vulnerability is due to trusting user input without validation. An attacker could exploit this vulnerability by sending crafted packets to the Remote Access SSL VPN server. A successful exploit could allow the attacker to cause the device web interface to stop responding, resulting in a DoS condition.
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-03-04T17:19:36.377Z

Reserved: 2025-10-08T11:59:15.371Z

Link: CVE-2026-20103

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-04T18:16:25.840

Modified: 2026-03-04T18:16:25.840

Link: CVE-2026-20103

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses