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8.6

Cisco ASA and FTD Software VPN Flaw Allows Remote Device Restart

CVE-2024-20495 · published 2 years ago
Summary

A flaw in the VPN feature of Cisco's security software allows an attacker to remotely restart the device, causing it to be unavailable. This could happen without any authentication and could be exploited by sending a specially crafted message. Affected device owners should apply the latest security updates to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cisco adaptive_security_appliance_software 9.8.4.12
9.8.4.15
9.8.4.17
9.8.4.20
9.8.4.22
9.8.4.25
9.8.4.26
9.8.4.29
9.8.4.32
9.8.4.33
9.8.4.34
9.8.4.35
118 more version ranges
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.8.4.12:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3.16
6.2.3.17
6.2.3.18
6.4.0.8
6.4.0.9
6.4.0.10
6.4.0.11
6.4.0.12
6.4.0.13
6.4.0.14
6.4.0.15
6.4.0.16
33 more version ranges
cpe:2.3:a:cisco:firepower_threat_defense:6.2.3.16:*:*:*:*:*:*:*
Original advisory text
A vulnerability in the Remote Access VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacke...
A vulnerability in the Remote Access VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition on an affected device.

This vulnerability is due to improper validation of client key data after the TLS session is established. An attacker could exploit this vulnerability by sending a crafted key value to an affected system over the secure TLS session. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker partial control
Severity
8.6 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-20Improper Input Validation
Timeline
Published23 Oct 2024
Updated4 Nov 2026
First seen7 Mar 2026
Sources
CVE-2024-20495 · NVD
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