ReviewHigh

CVE-2022-20946

Cisco Cisco Firepower Threat Defense Software, secure firewall threat defense

A vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature 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. This vulnerability is due to a memory handling error that occurs when GRE traffic is processed. An attacker could exploit this vulnerability by sending a crafted GRE payload through an affected device. A successful exploit could allow the attacker to cause the device to restart, resulting in a DoS condition. https://tools.cisco.com/security/c...

CVSS: 7.5
EPSS: 0.89%
CISA KEV: Not listed
Published: 2022.11.16

PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.89%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: Cisco Cisco Firepower Threat Defense Software, secure firewall threat defense
Affected versions: >= 6.6.0, >= 6.6.0.1, >= 6.6.1, >= 6.6.3, >= 6.6.4, >= 6.6.5, >= 6.6.5.1, >= 6.6.5.2, >= 6.4.0, >= 6.4.0.1, >= 6.4.0.3, >= 6.4.0.2, >= 6.4.0.4, >= 6.4.0.5, >= 6.4.0.6, >= 6.4.0.7, >= 6.4.0.8, >= 6.4.0.9, >= 6.4.0.10, >= 6.4.0.11
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Cisco Cisco Firepower Threat Defense Software, secure firewall threat defense and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-122, CWE-787