HIGH
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
Published Mar 4, 2026
8.6
HIGHCVSS 3.1
EPSS 0.35%
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.
Affected products
-
- Version 9.12.4.48StatusaffectedConstraints-
- Version 9.12.4.50StatusaffectedConstraints-
- Version 9.12.4.52StatusaffectedConstraints-
- Version 9.12.4.54StatusaffectedConstraints-
- Version 9.12.4.55StatusaffectedConstraints-
- Version 9.12.4.56StatusaffectedConstraints-
- Version 9.12.4.58StatusaffectedConstraints-
- Version 9.12.4.62StatusaffectedConstraints-
- Version 9.12.4.65StatusaffectedConstraints-
- Version 9.12.4.67StatusaffectedConstraints-
- Version 9.16.3.15StatusaffectedConstraints-
- Version 9.16.3.19StatusaffectedConstraints-
- Version 9.16.3.23StatusaffectedConstraints-
- Version 9.16.4StatusaffectedConstraints-
- Version 9.16.4.14StatusaffectedConstraints-
- Version 9.16.4.19StatusaffectedConstraints-
- Version 9.16.4.27StatusaffectedConstraints-
- Version 9.16.4.38StatusaffectedConstraints-
- Version 9.16.4.39StatusaffectedConstraints-
- Version 9.16.4.42StatusaffectedConstraints-
- Version 9.16.4.48StatusaffectedConstraints-
- Version 9.16.4.55StatusaffectedConstraints-
- Version 9.16.4.57StatusaffectedConstraints-
- Version 9.16.4.61StatusaffectedConstraints-
- Version 9.16.4.62StatusaffectedConstraints-
- Version 9.16.4.67StatusaffectedConstraints-
- Version 9.16.4.70StatusaffectedConstraints-
- Version 9.16.4.71StatusaffectedConstraints-
- Version 9.16.4.76StatusaffectedConstraints-
- Version 9.16.4.82StatusaffectedConstraints-
- Version 9.16.4.84StatusaffectedConstraints-
- Version 9.16.4.9StatusaffectedConstraints-
- Version 9.17.1.20StatusaffectedConstraints-
- Version 9.17.1.30StatusaffectedConstraints-
- Version 9.17.1.33StatusaffectedConstraints-
- Version 9.17.1.39StatusaffectedConstraints-
- Version 9.17.1.45StatusaffectedConstraints-
- Version 9.17.1.46StatusaffectedConstraints-
- Version 9.18.1.3StatusaffectedConstraints-
- Version 9.18.2StatusaffectedConstraints-
- Version 9.18.2.5StatusaffectedConstraints-
- Version 9.18.2.7StatusaffectedConstraints-
- Version 9.18.2.8StatusaffectedConstraints-
- Version 9.18.3StatusaffectedConstraints-
- Version 9.18.3.39StatusaffectedConstraints-
- Version 9.18.3.46StatusaffectedConstraints-
- Version 9.18.3.53StatusaffectedConstraints-
- Version 9.18.3.55StatusaffectedConstraints-
- Version 9.18.3.56StatusaffectedConstraints-
- Version 9.18.4StatusaffectedConstraints-
- Version 9.18.4.22StatusaffectedConstraints-
- Version 9.18.4.24StatusaffectedConstraints-
- Version 9.18.4.29StatusaffectedConstraints-
- Version 9.18.4.34StatusaffectedConstraints-
- Version 9.18.4.40StatusaffectedConstraints-
- Version 9.18.4.47StatusaffectedConstraints-
- Version 9.18.4.5StatusaffectedConstraints-
- Version 9.18.4.50StatusaffectedConstraints-
- Version 9.18.4.52StatusaffectedConstraints-
- Version 9.18.4.53StatusaffectedConstraints-
- Version 9.18.4.57StatusaffectedConstraints-
- Version 9.18.4.8StatusaffectedConstraints-
- Version 9.19.1StatusaffectedConstraints-
- Version 9.19.1.12StatusaffectedConstraints-
- Version 9.19.1.18StatusaffectedConstraints-
- Version 9.19.1.22StatusaffectedConstraints-
- Version 9.19.1.24StatusaffectedConstraints-
- Version 9.19.1.27StatusaffectedConstraints-
- Version 9.19.1.28StatusaffectedConstraints-
- Version 9.19.1.31StatusaffectedConstraints-
- Version 9.19.1.37StatusaffectedConstraints-
- Version 9.19.1.38StatusaffectedConstraints-
- Version 9.19.1.42StatusaffectedConstraints-
- Version 9.19.1.5StatusaffectedConstraints-
- Version 9.19.1.9StatusaffectedConstraints-
- Version 9.20.1StatusaffectedConstraints-
- Version 9.20.1.5StatusaffectedConstraints-
- Version 9.20.2StatusaffectedConstraints-
- Version 9.20.2.10StatusaffectedConstraints-
- Version 9.20.2.21StatusaffectedConstraints-
- Version 9.20.2.22StatusaffectedConstraints-
- Version 9.20.3StatusaffectedConstraints-
- Version 9.20.3.10StatusaffectedConstraints-
- Version 9.20.3.13StatusaffectedConstraints-
- Version 9.20.3.16StatusaffectedConstraints-
- Version 9.20.3.20StatusaffectedConstraints-
- Version 9.20.3.4StatusaffectedConstraints-
- Version 9.20.3.7StatusaffectedConstraints-
- Version 9.20.3.9StatusaffectedConstraints-
- Version 9.22.1.1StatusaffectedConstraints-
- Version 9.22.1.2StatusaffectedConstraints-
- Version 9.22.1.3StatusaffectedConstraints-
- Version 9.22.1.6StatusaffectedConstraints-
- Version 9.22.2StatusaffectedConstraints-
- Version 9.22.2.4StatusaffectedConstraints-
- Version 9.23.1StatusaffectedConstraints-
- Version 9.23.1.3StatusaffectedConstraints-
- Version
-
- Version 6.4.0.16StatusaffectedConstraints-
- Version 6.4.0.17StatusaffectedConstraints-
- Version 6.4.0.18StatusaffectedConstraints-
- Version 7.0.4StatusaffectedConstraints-
- Version 7.0.5StatusaffectedConstraints-
- Version 7.0.6StatusaffectedConstraints-
- Version 7.0.6.1StatusaffectedConstraints-
- Version 7.0.6.2StatusaffectedConstraints-
- Version 7.0.6.3StatusaffectedConstraints-
- Version 7.0.7StatusaffectedConstraints-
- Version 7.0.8StatusaffectedConstraints-
- Version 7.0.8.1StatusaffectedConstraints-
- Version 7.1.0.3StatusaffectedConstraints-
- Version 7.2.1StatusaffectedConstraints-
- Version 7.2.10StatusaffectedConstraints-
- Version 7.2.10.2StatusaffectedConstraints-
- Version 7.2.2StatusaffectedConstraints-
- Version 7.2.3StatusaffectedConstraints-
- Version 7.2.4StatusaffectedConstraints-
- Version 7.2.4.1StatusaffectedConstraints-
- Version 7.2.5StatusaffectedConstraints-
- Version 7.2.5.1StatusaffectedConstraints-
- Version 7.2.5.2StatusaffectedConstraints-
- Version 7.2.6StatusaffectedConstraints-
- Version 7.2.7StatusaffectedConstraints-
- Version 7.2.8StatusaffectedConstraints-
- Version 7.2.8.1StatusaffectedConstraints-
- Version 7.2.9StatusaffectedConstraints-
- Version 7.3.0StatusaffectedConstraints-
- Version 7.3.1StatusaffectedConstraints-
- Version 7.3.1.1StatusaffectedConstraints-
- Version 7.3.1.2StatusaffectedConstraints-
- Version 7.4.0StatusaffectedConstraints-
- Version 7.4.1StatusaffectedConstraints-
- Version 7.4.1.1StatusaffectedConstraints-
- Version 7.4.2StatusaffectedConstraints-
- Version 7.4.2.1StatusaffectedConstraints-
- Version 7.4.2.2StatusaffectedConstraints-
- Version 7.4.2.3StatusaffectedConstraints-
- Version 7.4.2.4StatusaffectedConstraints-
- Version 7.6.0StatusaffectedConstraints-
- Version 7.6.1StatusaffectedConstraints-
- Version 7.6.2StatusaffectedConstraints-
- Version 7.6.2.1StatusaffectedConstraints-
- Version 7.7.0StatusaffectedConstraints-
- Version 7.7.10StatusaffectedConstraints-
- Version 7.7.10.1StatusaffectedConstraints-
- Version
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 | n/a |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | n/a |
|
Configuration 1
OR
- ≥ 9.12.1 · < 9.16.4.85
- ≥ 9.17.1 · < 9.18.4.66
- ≥ 9.19.1 · < 9.20.4
- ≥ 9.22.1.1 · < 9.22.2.4
- ≥ 9.23.1 · < 9.23.1.7
Configuration 2
OR
- ≥ 6.4.0 · < 7.0.9
- ≥ 7.1.0 · < 7.2.11
- ≥ 7.3.0 · < 7.4.3
- ≥ 7.6.0 · < 7.6.4
- ≥ 7.7.0 · < 7.7.11
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
8.6 HIGH CVE.org
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality Impact None
Integrity Impact None
Availability Impact High
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Mar 4, 2026 · SSVC 2.0.3
0.35% 0.00351
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.00351
Score over time
Mar–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.35% (0.00351) | 26.34th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.35% (0.00351) | 26.69th | v5 (v2026.06.15) |
| Mar 5, 2026 | 0.05% (0.00050) | 15.46th | v4 (v2025.03.14) |
Weaknesses (1)
References (1)
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC Vendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC | Vendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner cisco
Published Mar 4, 2026
Updated Mar 4, 2026
Reserved Oct 8, 2025
Link CVE-2026-20103
CISA Vulnrichment
Updated Mar 4, 2026