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CVE-2024-20495

HIGHCVSS 8.6/10EPSS 0.51%

Last modified

CVE-2024-20495 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
8.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS Probability
0.51%

41.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance Software9.8.4.12
CiscoAdaptive Security Appliance Software9.8.4.15
CiscoAdaptive Security Appliance Software9.8.4.17
CiscoAdaptive Security Appliance Software9.8.4.20
CiscoAdaptive Security Appliance Software9.8.4.22
CiscoAdaptive Security Appliance Software9.8.4.25
CiscoAdaptive Security Appliance Software9.8.4.26
CiscoAdaptive Security Appliance Software9.8.4.29
CiscoAdaptive Security Appliance Software9.8.4.32
CiscoAdaptive Security Appliance Software9.8.4.33
CiscoAdaptive Security Appliance Software9.8.4.34
CiscoAdaptive Security Appliance Software9.8.4.35
CiscoAdaptive Security Appliance Software9.8.4.39
CiscoAdaptive Security Appliance Software9.8.4.40
CiscoAdaptive Security Appliance Software9.8.4.41
CiscoAdaptive Security Appliance Software9.8.4.43
CiscoAdaptive Security Appliance Software9.8.4.44
CiscoAdaptive Security Appliance Software9.8.4.45
CiscoAdaptive Security Appliance Software9.8.4.46
CiscoAdaptive Security Appliance Software9.8.4.48
CiscoAdaptive Security Appliance Software9.12.3
CiscoAdaptive Security Appliance Software9.12.3.2
CiscoAdaptive Security Appliance Software9.12.3.7
CiscoAdaptive Security Appliance Software9.12.3.9
CiscoAdaptive Security Appliance Software9.12.3.12
CiscoAdaptive Security Appliance Software9.12.4
CiscoAdaptive Security Appliance Software9.12.4.2
CiscoAdaptive Security Appliance Software9.12.4.4
CiscoAdaptive Security Appliance Software9.12.4.7
CiscoAdaptive Security Appliance Software9.12.4.8
CiscoAdaptive Security Appliance Software9.12.4.10
CiscoAdaptive Security Appliance Software9.12.4.13
CiscoAdaptive Security Appliance Software9.12.4.18
CiscoAdaptive Security Appliance Software9.12.4.24
CiscoAdaptive Security Appliance Software9.12.4.26
CiscoAdaptive Security Appliance Software9.12.4.29
CiscoAdaptive Security Appliance Software9.12.4.30
CiscoAdaptive Security Appliance Software9.12.4.35
CiscoAdaptive Security Appliance Software9.12.4.37
CiscoAdaptive Security Appliance Software9.12.4.38
CiscoAdaptive Security Appliance Software9.12.4.39
CiscoAdaptive Security Appliance Software9.12.4.40
CiscoAdaptive Security Appliance Software9.12.4.41
CiscoAdaptive Security Appliance Software9.12.4.47
CiscoAdaptive Security Appliance Software9.12.4.48
CiscoAdaptive Security Appliance Software9.12.4.50
CiscoAdaptive Security Appliance Software9.12.4.52
CiscoAdaptive Security Appliance Software9.12.4.54
CiscoAdaptive Security Appliance Software9.12.4.55
CiscoAdaptive Security Appliance Software9.12.4.56

Showing 50 of 175 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2024-20495?
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.
How severe is CVE-2024-20495?
CVE-2024-20495 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.
How do I fix CVE-2024-20495?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST