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CVE-2024-20493

MEDIUMCVSS 5.3/10EPSS 0.53%

Last modified

CVE-2024-20493 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A vulnerability in the login authentication functionality of the Remote Access SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to deny further VPN user authentications for several minutes, resulting in a temporary denial of service (DoS) condition. This vulnerability is due to ineffective handling of memory resources during the authentication process. An attacker could exploit this vulnerability by sending crafted packets, which could cause resource exhaustion of the authentication process. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

Description

A vulnerability in the login authentication functionality of the Remote Access SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to deny further VPN user authentications for several minutes, resulting in a temporary denial of service (DoS) condition. This vulnerability is due to ineffective handling of memory resources during the authentication process. An attacker could exploit this vulnerability by sending crafted packets, which could cause resource exhaustion of the authentication process. A successful exploit could allow the attacker to deny authentication for Remote Access SSL VPN users for several minutes, resulting in a temporary DoS condition.

Metrics

CVSS 3.1
5.3/10

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

EPSS Probability
0.53%

40.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoFirepower Threat Defense Software6.2.3
CiscoFirepower Threat Defense Software6.2.3.1
CiscoFirepower Threat Defense Software6.2.3.2
CiscoFirepower Threat Defense Software6.2.3.3
CiscoFirepower Threat Defense Software6.2.3.4
CiscoFirepower Threat Defense Software6.2.3.5
CiscoFirepower Threat Defense Software6.2.3.6
CiscoFirepower Threat Defense Software6.2.3.7
CiscoFirepower Threat Defense Software6.2.3.8
CiscoFirepower Threat Defense Software6.2.3.9
CiscoFirepower Threat Defense Software6.2.3.10
CiscoFirepower Threat Defense Software6.2.3.11
CiscoFirepower Threat Defense Software6.2.3.12
CiscoFirepower Threat Defense Software6.2.3.13
CiscoFirepower Threat Defense Software6.2.3.14
CiscoFirepower Threat Defense Software6.2.3.15
CiscoFirepower Threat Defense Software6.2.3.16
CiscoFirepower Threat Defense Software6.2.3.17
CiscoFirepower Threat Defense Software6.2.3.18
CiscoFirepower Threat Defense Software6.4.0
CiscoFirepower Threat Defense Software6.4.0.1
CiscoFirepower Threat Defense Software6.4.0.2
CiscoFirepower Threat Defense Software6.4.0.3
CiscoFirepower Threat Defense Software6.4.0.4
CiscoFirepower Threat Defense Software6.4.0.5
CiscoFirepower Threat Defense Software6.4.0.6
CiscoFirepower Threat Defense Software6.4.0.7
CiscoFirepower Threat Defense Software6.4.0.8
CiscoFirepower Threat Defense Software6.4.0.9
CiscoFirepower Threat Defense Software6.4.0.10
CiscoFirepower Threat Defense Software6.4.0.11
CiscoFirepower Threat Defense Software6.4.0.12
CiscoFirepower Threat Defense Software6.4.0.13
CiscoFirepower Threat Defense Software6.4.0.14
CiscoFirepower Threat Defense Software6.4.0.15
CiscoFirepower Threat Defense Software6.4.0.16
CiscoFirepower Threat Defense Software6.4.0.17
CiscoFirepower Threat Defense Software6.4.0.18
CiscoFirepower Threat Defense Software6.6.0
CiscoFirepower Threat Defense Software6.6.0.1
CiscoFirepower Threat Defense Software6.6.1
CiscoFirepower Threat Defense Software6.6.3
CiscoFirepower Threat Defense Software6.6.4
CiscoFirepower Threat Defense Software6.6.5
CiscoFirepower Threat Defense Software6.6.5.1
CiscoFirepower Threat Defense Software6.6.5.2
CiscoFirepower Threat Defense Software6.6.7
CiscoFirepower Threat Defense Software6.6.7.1
CiscoFirepower Threat Defense Software6.6.7.2
CiscoFirepower Threat Defense Software6.7.0

Showing 50 of 294 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2024-20493?
A vulnerability in the login authentication functionality of the Remote Access SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to deny further VPN user authentications for several minutes, resulting in a temporary denial of service (DoS) condition. This vulnerability is due to ineffective handling of memory resources during the authentication process. An attacker could exploit this vulnerability by sending crafted packets, which could cause resource exhaustion of the authentication process. A successful exploit could allow the attacker to deny authentication for Remote Access SSL VPN users for several minutes, resulting in a temporary DoS condition.
How severe is CVE-2024-20493?
CVE-2024-20493 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.
How do I fix CVE-2024-20493?
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-2024-20493?

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

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Source: NVD / NIST