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8.6

Cisco SSL VPN: Remote attacker can cause network device to crash

CVE-2024-20402 · published 2 years ago
Summary

An attacker can send a specially crafted message to a Cisco SSL VPN server and cause the device to crash, resulting in a denial of service. This affects Cisco ASA and FTD software. To mitigate this risk, ensure your device is up to date with the latest security patches.

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 9.12.4.37
9.12.4.38
9.12.4.39
9.12.4.40
9.12.4.41
9.12.4.47
9.12.4.48
9.12.4.50
9.12.4.52
9.12.4.54
9.12.4.55
9.12.4.56
183 more version ranges
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.12.4.37:*:*:*:*:*:*:*
cisco firepower_threat_defense 6.2.3
6.2.3.1
6.2.3.2
6.2.3.3
6.2.3.4
6.2.3.5
6.2.3.6
6.2.3.7
6.2.3.8
6.2.3.9
6.2.3.10
6.2.3.11
75 more version ranges
cpe:2.3:a:cisco:firepower_threat_defense:6.2.3:*:*:*:*:*:*:*
Original advisory text
A vulnerability in the SSL VPN feature for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to caus...
A vulnerability in the SSL VPN feature for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition.

This vulnerability is due to a logic error in memory management when the device is handling SSL VPN connections. An attacker could exploit this vulnerability by sending crafted SSL/TLS packets to the SSL VPN server of the affected device. 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-788Access of Memory Location After End of Buffer
Timeline
Published23 Oct 2024
Updated4 Nov 2026
First seen7 Mar 2026
Sources
CVE-2024-20402 · NVD
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