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CVE-2021-1573

HIGHCVSS 7.5/10EPSS 1.31%

Last modified

CVE-2021-1573 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper input validation when parsing HTTPS requests. EPSS estimates a 1.31% chance of exploitation in the next 30 days.

Description

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a malicious HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in 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
1.31%

66.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAdaptive Security Appliance<= 9.7
CiscoFirepower Threat Defense<= 6.2.2
CiscoFirepower Threat Defense>= 6.2.3, < 6.4.0.13
CiscoFirepower Threat Defense>= 6.5.0, < 6.6.5
CiscoFirepower Threat Defense>= 6.7.0, < 6.7.0.3
CiscoFirepower Threat Defense7.0.0
CiscoAdaptive Security Appliance Software>= 9.8, < 9.8.4.40
CiscoAdaptive Security Appliance Software>= 9.9, < 9.12.4.26
CiscoAdaptive Security Appliance Software>= 9.13, < 9.14.3
CiscoAdaptive Security Appliance Software>= 9.15, < 9.15.1.17
CiscoAdaptive Security Appliance Software>= 9.16, < 9.16.1.28

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-1573?
A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a malicious HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
How severe is CVE-2021-1573?
CVE-2021-1573 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.31% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1573?
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-2021-1573?

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

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Source: NVD / NIST