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CVE-2022-20767

Cisco Secure Firewall Threat Defense denial of service

8.6 HIGHEPSS 1.69%
  1. Published3 May 2022

Description

A vulnerability in the Snort rule evaluation function of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of the DNS reputation enforcement rule. An attacker could exploit this vulnerability by sending crafted UDP packets through an affected device to force a buildup of UDP connections. A successful exploit could allow the attacker to cause traffic that is going through the affected device to be dropped, resulting in a DoS condition. Note: This vulnerability only affects Cisco FTD devices that are running Snort 3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected products

Cisco Secure Firewall Threat Defense< 7.0.2 · 7.1.0

Remediation

Fixed in
Cisco Secure Firewall Threat Defense≥ 7.0.2

References

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Frequently asked

Is CVE-2022-20767 being actively exploited?

CVE-2022-20767 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.69%.

How severe is CVE-2022-20767?

CVE-2022-20767 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 1.69% probability of exploitation.

Which products are affected by CVE-2022-20767?

Affected products include Cisco Secure Firewall Threat Defense.

How do I fix CVE-2022-20767?

Upgrade affected software to a fixed version, for example Cisco Secure Firewall Threat Defense 7.0.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2022-20767 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.