Strix
26.1K

CVE-2024-20481

MEDIUMCVSS 5.8/10Actively ExploitedEPSS 15.95%

Last modified

CVE-2024-20481 is a medium-severity vulnerability rated 5.8/10 on the CVSS scale. A vulnerability in the Remote Access VPN (RAVPN) service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) of the RAVPN service. This vulnerability is due to resource exhaustion. An attacker could exploit this vulnerability by sending a large number of VPN authentication requests to an affected device. CISA has confirmed active exploitation in the wild. EPSS estimates a 15.95% chance of exploitation in the next 30 days.

Description

A vulnerability in the Remote Access VPN (RAVPN) service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) of the RAVPN service. This vulnerability is due to resource exhaustion. An attacker could exploit this vulnerability by sending a large number of VPN authentication requests to an affected device. A successful exploit could allow the attacker to exhaust resources, resulting in a DoS of the RAVPN service on the affected device. Depending on the impact of the attack, a reload of the device may be required to restore the RAVPN service. Services that are not related to VPN are not affected. Cisco Talos discussed these attacks in the blog post Large-scale brute-force activity targeting VPNs, SSH services with commonly used login credentials.

Metrics

CVSS 3.1
5.8/10

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

EPSS Probability
15.95%

96.5th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .

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 289 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2024-20481?
A vulnerability in the Remote Access VPN (RAVPN) service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) of the RAVPN service. This vulnerability is due to resource exhaustion. An attacker could exploit this vulnerability by sending a large number of VPN authentication requests to an affected device. A successful exploit could allow the attacker to exhaust resources, resulting in a DoS of the RAVPN service on the affected device. Depending on the impact of the attack, a reload of the device may be required to restore the RAVPN service. Services that are not related to VPN are not affected. Cisco Talos discussed these attacks in the blog post Large-scale brute-force activity targeting VPNs, SSH services with commonly used login credentials.
How severe is CVE-2024-20481?
CVE-2024-20481 has a CVSS score of 5.8/10 (MEDIUM severity). The EPSS model estimates a 15.95% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2024-20481?
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-2024-20481?

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

Scan your code now

Source: NVD / NIST