CVE-2022-20715

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Remote Access SSL VPN Denial of Service Vulnerability

HIGH
8.6
CVSS Score
Published: May 3, 2022 at 03:16 AM UTC
Updated: August 11, 2026 at 07:37 PM UTC
2 products affected across 1 vendorAdaptive Security ApplianceSecure Firewall Threat Defense

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Severity
HIGH8.6
Exploit prediction
EPSS 1%

Description

A vulnerability in the remote access SSL VPN features of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper validation of errors that are logged as a result of client connections that are made using remote access VPN. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to cause the affected device to restart, resulting in a DoS condition.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 9.8.4.449.13 ≤ v < 9.14.49.15 ≤ v < 9.15.1.219.16.0 ≤ v < 9.16.2.149.17.0 ≤ v < 9.17.1.79.9 ≤ v < 9.12.4.38
Affected range stops below 9.12.4.38, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.14.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.15.1.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.16.2.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.17.1.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.8.4.44, so it looks safe — our inference, not a vendor statement
v < 6.4.0.156.5.0 ≤ v < 6.6.5.26.7.0 ≤ v < 7.0.27.1.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

8.6HIGHcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-399CWE-20

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