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CVE-2021-1501

HIGHCVSS 7.5/10EPSS 1.34%

Last modified

CVE-2021-1501 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in the SIP inspection engine 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 crash that occurs during a hash lookup for a SIP pinhole connection. An attacker could exploit this vulnerability by sending crafted SIP traffic through an affected device. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

A vulnerability in the SIP inspection engine 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 crash that occurs during a hash lookup for a SIP pinhole connection. An attacker could exploit this vulnerability by sending crafted SIP traffic through an affected device. A successful exploit could allow the attacker to cause 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
1.34%

67.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoFirepower Threat Defense>= 6.2.2, < 6.4.0.12
CiscoFirepower Threat Defense>= 6.5.0, < 6.6.4
CiscoFirepower Threat Defense>= 6.7.0, < 6.7.0.2
CiscoAdaptive Security Appliance Software>= 9.8, < 9.8.4.34
CiscoAdaptive Security Appliance Software>= 9.9, < 9.9.2.85
CiscoAdaptive Security Appliance Software>= 9.10, < 9.12.4.18
CiscoAdaptive Security Appliance Software>= 9.13, < 9.13.1.21
CiscoAdaptive Security Appliance Software>= 9.14, < 9.14.2.13
CiscoAdaptive Security Appliance Software>= 9.15, < 9.15.1.15

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-1501?
A vulnerability in the SIP inspection engine 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 crash that occurs during a hash lookup for a SIP pinhole connection. An attacker could exploit this vulnerability by sending crafted SIP traffic through an affected device. A successful exploit could allow the attacker to cause a crash and reload of the affected device.
How severe is CVE-2021-1501?
CVE-2021-1501 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1501?
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-2021-1501?

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

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Source: NVD / NIST