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CVE-2020-3555

HIGHCVSS 7.5/10EPSS 1.68%

Last modified

CVE-2020-3555 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in the SIP inspection process of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a watchdog timeout and crash during the cleanup of threads that are associated with a SIP connection that is being deleted from the connection list. EPSS estimates a 1.68% chance of exploitation in the next 30 days.

Description

A vulnerability in the SIP inspection process of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a watchdog timeout and crash during the cleanup of threads that are associated with a SIP connection that is being deleted from the connection list. An attacker could exploit this vulnerability by sending a high rate of crafted SIP traffic through an affected device. A successful exploit could allow the attacker to cause a watchdog timeout and crash, resulting in a crash and reload of the affected device.

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
1.68%

74.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance< 9.6.4.43
CiscoSecure Firewall Threat Defense<= 6.2.2
CiscoSecure Firewall Threat Defense>= 6.3.0, < 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 Defense6.6.0
CiscoAdaptive Security Appliance Software>= 9.7.0, < 9.8.4.24
CiscoAdaptive Security Appliance Software>= 9.9.0, < 9.9.2.80
CiscoAdaptive Security Appliance Software>= 9.10.0, < 9.10.1.43
CiscoAdaptive Security Appliance Software>= 9.12.0, < 9.12.4.2
CiscoAdaptive Security Appliance Software>= 9.13.0, < 9.13.1.13
CiscoAdaptive Security Appliance Software>= 9.14.0, < 9.14.1.19

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-3555?
A vulnerability in the SIP inspection process of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a watchdog timeout and crash during the cleanup of threads that are associated with a SIP connection that is being deleted from the connection list. An attacker could exploit this vulnerability by sending a high rate of crafted SIP traffic through an affected device. A successful exploit could allow the attacker to cause a watchdog timeout and crash, resulting in a crash and reload of the affected device.
How severe is CVE-2020-3555?
CVE-2020-3555 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.68% probability of exploitation in the next 30 days.
How do I fix CVE-2020-3555?
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