CVE-2026-20100
Received
Received - Intake
LUA Injection in Cisco ASA VPN Causes Remote DoS
Publication date: 2026-03-04
Last updated on: 2026-05-04
Assigner: Cisco Systems, Inc.
Description
Description
A vulnerability in the LUA interperter of the Remote Access SSL VPN feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker with a valid VPN connection to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This does not affect the management or MUS interfaces.
This vulnerability is due to trusting user input without validation in the LUA interprerter. An attacker could exploit this vulnerability by sending crafted HTTP packets to the Remote Access SSL VPN server. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| cisco | adaptive_security_appliance_software | 9.16.1 |
| cisco | adaptive_security_appliance_software | 9.12.2 |
| cisco | adaptive_security_appliance_software | 9.12.2.5 |
| cisco | adaptive_security_appliance_software | 9.12.4.4 |
| cisco | adaptive_security_appliance_software | 9.12.3.2 |
| cisco | adaptive_security_appliance_software | 9.12.3.7 |
| cisco | adaptive_security_appliance_software | 9.12.4 |
| cisco | adaptive_security_appliance_software | 9.12.3.12 |
| cisco | adaptive_security_appliance_software | 9.12.4.37 |
| cisco | adaptive_security_appliance_software | 9.12.4.38 |
| cisco | adaptive_security_appliance_software | 9.12.4.39 |
| cisco | adaptive_security_appliance_software | 9.17.1 |
| cisco | adaptive_security_appliance_software | 9.12.3 |
| cisco | adaptive_security_appliance_software | 9.12.3.9 |
| cisco | adaptive_security_appliance_software | 9.12.4.26 |
| cisco | adaptive_security_appliance_software | 9.12.4.30 |
| cisco | adaptive_security_appliance_software | 9.16.1.28 |
| cisco | adaptive_security_appliance_software | 9.17.1.7 |
| cisco | adaptive_security_appliance_software | 9.16.3.14 |
| cisco | adaptive_security_appliance_software | 9.16.4 |
| cisco | adaptive_security_appliance_software | 9.18.2.5 |
| cisco | adaptive_security_appliance_software | 9.17.1.10 |
| cisco | adaptive_security_appliance_software | 9.17.1.13 |
| cisco | adaptive_security_appliance_software | 9.18.1 |
| cisco | adaptive_security_appliance_software | 9.18.1.3 |
| cisco | adaptive_security_appliance_software | 9.12.1 |
| cisco | adaptive_security_appliance_software | 9.12.1.2 |
| cisco | adaptive_security_appliance_software | 9.12.1.3 |
| cisco | adaptive_security_appliance_software | 9.12.4.10 |
| cisco | adaptive_security_appliance_software | 9.12.4.13 |
| cisco | adaptive_security_appliance_software | 9.12.4.8 |
| cisco | adaptive_security_appliance_software | 9.12.4.18 |
| cisco | adaptive_security_appliance_software | 9.16.2.3 |
| cisco | adaptive_security_appliance_software | 9.16.2.7 |
| cisco | adaptive_security_appliance_software | 9.16.2.11 |
| cisco | adaptive_security_appliance_software | 9.16.2.13 |
| cisco | adaptive_security_appliance_software | 9.16.2.14 |
| cisco | adaptive_security_appliance_software | 9.17.1.11 |
| cisco | adaptive_security_appliance_software | 9.17.1.15 |
| cisco | adaptive_security_appliance_software | 9.12.4.2 |
| cisco | adaptive_security_appliance_software | 9.17.1.9 |
| cisco | adaptive_security_appliance_software | 9.12.2.4 |
| cisco | adaptive_security_appliance_software | 9.12.2.9 |
| cisco | adaptive_security_appliance_software | 9.12.2.1 |
| cisco | adaptive_security_appliance_software | 9.12.4.7 |
| cisco | adaptive_security_appliance_software | 9.12.4.24 |
| cisco | adaptive_security_appliance_software | 9.12.4.29 |
| cisco | adaptive_security_appliance_software | 9.12.4.35 |
| cisco | adaptive_security_appliance_software | 9.16.2 |
| cisco | adaptive_security_appliance_software | 9.16.3.3 |
| cisco | adaptive_security_appliance_software | 9.16.3 |
| cisco | adaptive_security_appliance_software | 9.18.2 |
| cisco | adaptive_security_appliance_software | 9.19.1.9 |
| cisco | adaptive_security_appliance_software | 9.19.1.5 |
| cisco | adaptive_security_appliance_software | 9.19.1.18 |
| cisco | adaptive_security_appliance_software | 9.19.1.12 |
| cisco | adaptive_security_appliance_software | 9.19.1 |
| cisco | adaptive_security_appliance_software | 9.18.3.55 |
| cisco | adaptive_security_appliance_software | 9.18.3.53 |
| cisco | adaptive_security_appliance_software | 9.18.3.46 |
| cisco | adaptive_security_appliance_software | 9.18.3.39 |
| cisco | adaptive_security_appliance_software | 9.18.3 |
| cisco | adaptive_security_appliance_software | 9.18.2.8 |
| cisco | adaptive_security_appliance_software | 9.18.2.7 |
| cisco | adaptive_security_appliance_software | 9.17.1.30 |
| cisco | adaptive_security_appliance_software | 9.17.1.20 |
| cisco | adaptive_security_appliance_software | 9.16.4.9 |
| cisco | adaptive_security_appliance_software | 9.16.4.38 |
| cisco | adaptive_security_appliance_software | 9.16.4.27 |
| cisco | adaptive_security_appliance_software | 9.16.4.19 |
| cisco | adaptive_security_appliance_software | 9.16.4.14 |
| cisco | adaptive_security_appliance_software | 9.16.3.23 |
| cisco | adaptive_security_appliance_software | 9.16.3.19 |
| cisco | adaptive_security_appliance_software | 9.16.3.15 |
| cisco | adaptive_security_appliance_software | 9.12.4.58 |
| cisco | adaptive_security_appliance_software | 9.12.4.56 |
| cisco | adaptive_security_appliance_software | 9.12.4.55 |
| cisco | adaptive_security_appliance_software | 9.12.4.54 |
| cisco | adaptive_security_appliance_software | 9.12.4.52 |
| cisco | adaptive_security_appliance_software | 9.12.4.50 |
| cisco | adaptive_security_appliance_software | 9.12.4.48 |
| cisco | adaptive_security_appliance_software | 9.12.4.47 |
| cisco | adaptive_security_appliance_software | 9.12.4.41 |
| cisco | adaptive_security_appliance_software | 9.12.4.40 |
| cisco | adaptive_security_appliance_software | 9.12.4.62 |
| cisco | adaptive_security_appliance_software | 9.12.4.65 |
| cisco | adaptive_security_appliance_software | 9.16.4.39 |
| cisco | adaptive_security_appliance_software | 9.16.4.42 |
| cisco | adaptive_security_appliance_software | 9.16.4.48 |
| cisco | adaptive_security_appliance_software | 9.16.4.55 |
| cisco | adaptive_security_appliance_software | 9.17.1.33 |
| cisco | adaptive_security_appliance_software | 9.18.3.56 |
| cisco | adaptive_security_appliance_software | 9.18.4 |
| cisco | adaptive_security_appliance_software | 9.18.4.5 |
| cisco | adaptive_security_appliance_software | 9.18.4.8 |
| cisco | adaptive_security_appliance_software | 9.19.1.22 |
| cisco | adaptive_security_appliance_software | 9.19.1.24 |
| cisco | adaptive_security_appliance_software | 9.19.1.27 |
| cisco | adaptive_security_appliance_software | 9.20.1 |
| cisco | adaptive_security_appliance_software | 9.20.1.5 |
| cisco | adaptive_security_appliance_software | 9.20.2 |
| cisco | adaptive_security_appliance_software | 9.20.2.21 |
| cisco | adaptive_security_appliance_software | 9.20.2.10 |
| cisco | adaptive_security_appliance_software | 9.19.1.31 |
| cisco | adaptive_security_appliance_software | 9.19.1.28 |
| cisco | adaptive_security_appliance_software | 9.18.4.24 |
| cisco | adaptive_security_appliance_software | 9.18.4.22 |
| cisco | adaptive_security_appliance_software | 9.17.1.39 |
| cisco | adaptive_security_appliance_software | 9.16.4.61 |
| cisco | adaptive_security_appliance_software | 9.16.4.57 |
| cisco | adaptive_security_appliance_software | 9.12.4.67 |
| cisco | adaptive_security_appliance_software | 9.20.3 |
| cisco | adaptive_security_appliance_software | 9.18.4.40 |
| cisco | adaptive_security_appliance_software | 9.16.4.70 |
| cisco | adaptive_security_appliance_software | 9.16.4.67 |
| cisco | adaptive_security_appliance_software | 9.20.2.22 |
| cisco | adaptive_security_appliance_software | 9.18.4.34 |
| cisco | adaptive_security_appliance_software | 9.18.4.29 |
| cisco | adaptive_security_appliance_software | 9.16.4.62 |
| cisco | adaptive_security_appliance_software | 9.20.3.4 |
| cisco | adaptive_security_appliance_software | 9.20.3.7 |
| cisco | adaptive_security_appliance_software | 9.22.1.1 |
| cisco | adaptive_security_appliance_software | 9.23.1 |
| cisco | adaptive_security_appliance_software | 9.16.4.71 |
| cisco | adaptive_security_appliance_software | 9.16.4.76 |
| cisco | adaptive_security_appliance_software | 9.16.4.82 |
| cisco | adaptive_security_appliance_software | 9.16.4.84 |
| cisco | adaptive_security_appliance_software | 9.17.1.45 |
| cisco | adaptive_security_appliance_software | 9.17.1.46 |
| cisco | adaptive_security_appliance_software | 9.18.4.47 |
| cisco | adaptive_security_appliance_software | 9.18.4.50 |
| cisco | adaptive_security_appliance_software | 9.18.4.52 |
| cisco | adaptive_security_appliance_software | 9.18.4.53 |
| cisco | adaptive_security_appliance_software | 9.18.4.57 |
| cisco | adaptive_security_appliance_software | 9.19.1.37 |
| cisco | adaptive_security_appliance_software | 9.19.1.38 |
| cisco | adaptive_security_appliance_software | 9.19.1.42 |
| cisco | adaptive_security_appliance_software | 9.20.3.10 |
| cisco | adaptive_security_appliance_software | 9.20.3.13 |
| cisco | adaptive_security_appliance_software | 9.20.3.16 |
| cisco | adaptive_security_appliance_software | 9.20.3.20 |
| cisco | adaptive_security_appliance_software | 9.20.3.9 |
| cisco | adaptive_security_appliance_software | 9.22.1.2 |
| cisco | adaptive_security_appliance_software | 9.22.1.3 |
| cisco | adaptive_security_appliance_software | 9.22.1.6 |
| cisco | adaptive_security_appliance_software | 9.22.2 |
| cisco | adaptive_security_appliance_software | 9.23.1.3 |
| cisco | firepower_threat_defense | 6.4.0 |
| cisco | firepower_threat_defense | 7.1.0 |
| cisco | firepower_threat_defense | 7.0.0 |
| cisco | firepower_threat_defense | 7.2.0.1 |
| cisco | firepower_threat_defense | 7.0.1 |
| cisco | firepower_threat_defense | 7.0.0.1 |
| cisco | firepower_threat_defense | 7.0.1.1 |
| cisco | firepower_threat_defense | 7.0.2 |
| cisco | firepower_threat_defense | 7.0.2.1 |
| cisco | firepower_threat_defense | 7.0.3 |
| cisco | firepower_threat_defense | 7.0.4 |
| cisco | firepower_threat_defense | 7.1.0.1 |
| cisco | firepower_threat_defense | 7.1.0.2 |
| cisco | firepower_threat_defense | 7.2.0 |
| cisco | firepower_threat_defense | 6.4.0.1 |
| cisco | firepower_threat_defense | 6.4.0.3 |
| cisco | firepower_threat_defense | 6.4.0.2 |
| cisco | firepower_threat_defense | 6.4.0.4 |
| cisco | firepower_threat_defense | 6.4.0.5 |
| cisco | firepower_threat_defense | 6.4.0.6 |
| cisco | firepower_threat_defense | 6.4.0.7 |
| cisco | firepower_threat_defense | 6.4.0.8 |
| cisco | firepower_threat_defense | 6.4.0.9 |
| cisco | firepower_threat_defense | 6.4.0.10 |
| cisco | firepower_threat_defense | 6.4.0.11 |
| cisco | firepower_threat_defense | 6.4.0.12 |
| cisco | firepower_threat_defense | 6.4.0.13 |
| cisco | firepower_threat_defense | 6.4.0.14 |
| cisco | firepower_threat_defense | 7.2.1 |
| cisco | firepower_threat_defense | 7.2.2 |
| cisco | firepower_threat_defense | 7.2.3 |
| cisco | firepower_threat_defense | 7.3.1.1 |
| cisco | firepower_threat_defense | 7.3.1 |
| cisco | firepower_threat_defense | 7.3.0 |
| cisco | firepower_threat_defense | 7.2.5 |
| cisco | firepower_threat_defense | 7.2.4.1 |
| cisco | firepower_threat_defense | 7.2.4 |
| cisco | firepower_threat_defense | 7.1.0.3 |
| cisco | firepower_threat_defense | 7.0.6 |
| cisco | firepower_threat_defense | 7.0.5 |
| cisco | firepower_threat_defense | 6.4.0.16 |
| cisco | firepower_threat_defense | 6.4.0.15 |
| cisco | firepower_threat_defense | 6.4.0.17 |
| cisco | firepower_threat_defense | 7.0.6.1 |
| cisco | firepower_threat_defense | 7.2.5.1 |
| cisco | firepower_threat_defense | 7.4.0 |
| cisco | firepower_threat_defense | 7.4.1 |
| cisco | firepower_threat_defense | 7.4.1.1 |
| cisco | firepower_threat_defense | 7.2.5.2 |
| cisco | firepower_threat_defense | 7.3.1.2 |
| cisco | firepower_threat_defense | 7.2.6 |
| cisco | firepower_threat_defense | 7.2.7 |
| cisco | firepower_threat_defense | 6.4.0.18 |
| cisco | firepower_threat_defense | 7.0.6.2 |
| cisco | firepower_threat_defense | 7.2.8 |
| cisco | firepower_threat_defense | 7.2.8.1 |
| cisco | firepower_threat_defense | 7.4.2 |
| cisco | firepower_threat_defense | 7.0.6.3 |
| cisco | firepower_threat_defense | 7.4.2.1 |
| cisco | firepower_threat_defense | 7.6.0 |
| cisco | firepower_threat_defense | 7.7.0 |
| cisco | firepower_threat_defense | 7.0.7 |
| cisco | firepower_threat_defense | 7.0.8 |
| cisco | firepower_threat_defense | 7.0.8.1 |
| cisco | firepower_threat_defense | 7.2.10 |
| cisco | firepower_threat_defense | 7.2.10.2 |
| cisco | firepower_threat_defense | 7.2.9 |
| cisco | firepower_threat_defense | 7.4.2.2 |
| cisco | firepower_threat_defense | 7.4.2.3 |
| cisco | firepower_threat_defense | 7.4.2.4 |
| cisco | firepower_threat_defense | 7.6.1 |
| cisco | firepower_threat_defense | 7.6.2 |
| cisco | firepower_threat_defense | 7.6.2.1 |
| cisco | firepower_threat_defense | 7.7.10 |
| cisco | firepower_threat_defense | 7.7.10.1 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-120 | The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the LUA interpreter of the Remote Access SSL VPN feature in Cisco Secure Firewall ASA and FTD software. It allows an authenticated remote attacker, who has a valid VPN connection, to send specially crafted HTTP packets to the VPN server. Because the LUA interpreter trusts user input without proper validation, the attacker can cause the device to reload unexpectedly.
The unexpected reload results in a denial of service (DoS) condition, disrupting normal device operation. This vulnerability does not affect the management or MUS interfaces.
How can this vulnerability impact me? :
The primary impact of this vulnerability is a denial of service (DoS) condition. An attacker with valid VPN credentials can cause the affected Cisco firewall device to reload unexpectedly, which disrupts network security services and connectivity.
This could lead to temporary loss of firewall protection, interruption of VPN services, and potential downtime for users relying on the device for secure remote access.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know
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