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CVE-2020-3529

HIGHCVSS 7.5/10EPSS 1.85%

Last modified

CVE-2020-3529 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in the SSL VPN negotiation process for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to inefficient direct memory access (DMA) memory management during the negotiation phase of an SSL VPN connection. EPSS estimates a 1.85% chance of exploitation in the next 30 days.

Description

A vulnerability in the SSL VPN negotiation process for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to inefficient direct memory access (DMA) memory management during the negotiation phase of an SSL VPN connection. An attacker could exploit this vulnerability by sending a steady stream of crafted Datagram TLS (DTLS) traffic to an affected device. A successful exploit could allow the attacker to exhaust DMA memory on the device and cause a DoS condition.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
1.85%

77.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance< 9.6.4.45
CiscoSecure Firewall Threat Defense< 6.3.0.6
CiscoSecure Firewall Threat Defense>= 6.4.0, < 6.4.0.10
CiscoSecure Firewall Threat Defense>= 6.5.0, < 6.5.0.5
CiscoSecure Firewall Threat Defense>= 6.6.0, < 6.6.1
CiscoAdaptive Security Appliance Software>= 9.8.0, < 9.8.4.29
CiscoAdaptive Security Appliance Software>= 9.9.0, < 9.9.2.80
CiscoAdaptive Security Appliance Software>= 9.10.0, < 9.10.1.44
CiscoAdaptive Security Appliance Software>= 9.12.0, < 9.12.4.4
CiscoAdaptive Security Appliance Software>= 9.13.0, < 9.13.1.13
CiscoAdaptive Security Appliance Software>= 9.14.0, < 9.14.1.30

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-3529?
A vulnerability in the SSL VPN negotiation process for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to inefficient direct memory access (DMA) memory management during the negotiation phase of an SSL VPN connection. An attacker could exploit this vulnerability by sending a steady stream of crafted Datagram TLS (DTLS) traffic to an affected device. A successful exploit could allow the attacker to exhaust DMA memory on the device and cause a DoS condition.
How severe is CVE-2020-3529?
CVE-2020-3529 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.85% probability of exploitation in the next 30 days.
How do I fix CVE-2020-3529?
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