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CVE-2024-20494

HIGHCVSS 8.6/10EPSS 0.52%

Last modified

CVE-2024-20494 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. A vulnerability in the TLS cryptography functionality 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. This vulnerability is due to improper data validation during the TLS 1.3 handshake. An attacker could exploit this vulnerability by sending a crafted TLS 1.3 packet to an affected system through a TLS 1.3-enabled listening socket. EPSS estimates a 0.52% chance of exploitation in the next 30 days.

Description

A vulnerability in the TLS cryptography functionality 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. This vulnerability is due to improper data validation during the TLS 1.3 handshake. An attacker could exploit this vulnerability by sending a crafted TLS 1.3 packet to an affected system through a TLS 1.3-enabled listening socket. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: This vulnerability can also impact the integrity of a device by causing VPN HostScan communication failures or file transfer failures when Cisco ASA Software is upgraded using Cisco Adaptive Security Device Manager (ASDM).

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
0.52%

40.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance Software9.19.1
CiscoAdaptive Security Appliance Software9.19.1.5
CiscoAdaptive Security Appliance Software9.19.1.9
CiscoAdaptive Security Appliance Software9.19.1.12
CiscoAdaptive Security Appliance Software9.19.1.18
CiscoAdaptive Security Appliance Software9.19.1.22
CiscoAdaptive Security Appliance Software9.19.1.24
CiscoAdaptive Security Appliance Software9.19.1.27
CiscoAdaptive Security Appliance Software9.19.1.28
CiscoAdaptive Security Appliance Software9.19.1.31
CiscoAdaptive Security Appliance Software9.20.1
CiscoAdaptive Security Appliance Software9.20.1.5
CiscoAdaptive Security Appliance Software9.20.2
CiscoAdaptive Security Appliance Software9.20.2.10
CiscoAdaptive Security Appliance Software9.20.2.21
CiscoAdaptive Security Appliance Software9.20.2.22
CiscoAdaptive Security Appliance Software9.20.3
CiscoFirepower Threat Defense7.3.0
CiscoFirepower Threat Defense7.3.1
CiscoFirepower Threat Defense7.3.1.1
CiscoFirepower Threat Defense7.3.1.2
CiscoFirepower Threat Defense7.4.0
CiscoFirepower Threat Defense7.4.1
CiscoFirepower Threat Defense7.4.1.1
CiscoFirepower Threat Defense7.4.2

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2024-20494?
A vulnerability in the TLS cryptography functionality 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. This vulnerability is due to improper data validation during the TLS 1.3 handshake. An attacker could exploit this vulnerability by sending a crafted TLS 1.3 packet to an affected system through a TLS 1.3-enabled listening socket. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. Note: This vulnerability can also impact the integrity of a device by causing VPN HostScan communication failures or file transfer failures when Cisco ASA Software is upgraded using Cisco Adaptive Security Device Manager (ASDM).
How severe is CVE-2024-20494?
CVE-2024-20494 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.52% probability of exploitation in the next 30 days.
How do I fix CVE-2024-20494?
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.

Are you affected by CVE-2024-20494?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST