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CVE-2022-20854

HIGHCVSS 7.5/10EPSS 0.87%

Last modified

CVE-2022-20854 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in the processing of SSH connections of Cisco Firepower Management Center (FMC) and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error handling when an SSH session fails to be established. An attacker could exploit this vulnerability by sending a high rate of crafted SSH connections to the instance. EPSS estimates a 0.87% chance of exploitation in the next 30 days.

Description

A vulnerability in the processing of SSH connections of Cisco Firepower Management Center (FMC) and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error handling when an SSH session fails to be established. An attacker could exploit this vulnerability by sending a high rate of crafted SSH connections to the instance. A successful exploit could allow the attacker to cause resource exhaustion, resulting in a reboot on 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
0.87%

54.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoSecure Firewall Management Center>= 6.1.0, <= 6.1.0.7
CiscoSecure Firewall Management Center>= 6.2.0, <= 6.2.0.6
CiscoSecure Firewall Management Center>= 6.2.2, <= 6.2.2.5
CiscoSecure Firewall Management Center>= 6.2.3, <= 6.2.3.18
CiscoSecure Firewall Management Center>= 6.3.0, <= 6.3.0.5
CiscoSecure Firewall Management Center>= 6.4.0, <= 6.4.0.15
CiscoSecure Firewall Management Center>= 6.5.0, <= 6.5.0.5
CiscoSecure Firewall Management Center>= 6.7.0, <= 6.7.0.3
CiscoSecure Firewall Management Center6.2.1
CiscoSecure Firewall Management Center6.6.0
CiscoSecure Firewall Management Center6.6.0.1
CiscoSecure Firewall Management Center6.6.1
CiscoSecure Firewall Management Center6.6.3
CiscoSecure Firewall Management Center6.6.4
CiscoSecure Firewall Management Center6.6.5
CiscoSecure Firewall Management Center6.6.5.1
CiscoSecure Firewall Management Center6.6.5.2
CiscoSecure Firewall Management Center7.0.0
CiscoSecure Firewall Management Center7.0.0.1
CiscoSecure Firewall Management Center7.0.1
CiscoSecure Firewall Management Center7.0.1.1
CiscoSecure Firewall Management Center7.0.2
CiscoSecure Firewall Management Center7.0.2.1
CiscoSecure Firewall Management Center7.0.3
CiscoSecure Firewall Management Center7.0.4
CiscoFirepower Threat Defense>= 6.1.0, <= 6.1.0.7
CiscoFirepower Threat Defense>= 6.2.0, <= 6.2.0.6
CiscoFirepower Threat Defense>= 6.2.2, <= 6.2.2.5
CiscoFirepower Threat Defense>= 6.2.3, <= 6.2.3.18
CiscoFirepower Threat Defense>= 6.3.0, <= 6.3.0.5
CiscoFirepower Threat Defense>= 6.4.0, <= 6.4.0.15
CiscoFirepower Threat Defense>= 6.5.0, <= 6.5.0.5
CiscoFirepower Threat Defense>= 6.7.0, <= 6.7.0.3
CiscoFirepower Threat Defense6.2.1
CiscoFirepower Threat Defense6.6.0
CiscoFirepower Threat Defense6.6.0.1
CiscoFirepower Threat Defense6.6.1
CiscoFirepower Threat Defense6.6.3
CiscoFirepower Threat Defense6.6.4
CiscoFirepower Threat Defense6.6.5
CiscoFirepower Threat Defense6.6.5.1
CiscoFirepower Threat Defense6.6.5.2
CiscoFirepower Threat Defense7.0.0
CiscoFirepower Threat Defense7.0.0.1
CiscoFirepower Threat Defense7.0.1
CiscoFirepower Threat Defense7.0.1.1
CiscoFirepower Threat Defense7.0.2
CiscoFirepower Threat Defense7.0.2.1
CiscoFirepower Threat Defense7.0.3
CiscoFirepower Threat Defense7.0.4

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2022-20854?
A vulnerability in the processing of SSH connections of Cisco Firepower Management Center (FMC) and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error handling when an SSH session fails to be established. An attacker could exploit this vulnerability by sending a high rate of crafted SSH connections to the instance. A successful exploit could allow the attacker to cause resource exhaustion, resulting in a reboot on the affected device.
How severe is CVE-2022-20854?
CVE-2022-20854 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.87% probability of exploitation in the next 30 days.
How do I fix CVE-2022-20854?
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-2022-20854?

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

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Source: NVD / NIST