CVE-2023-20270

Published Nov 1, 2023 CVSS 3.1 · 5.8 Medium EPSS < 1% KEV · Not listed

Description

A vulnerability in the interaction between the Server Message Block (SMB) protocol preprocessor and the Snort 3 detection engine for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the configured policies or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error-checking when the Snort 3 detection engine is processing SMB traffic. An attacker could exploit this vulnerability by sending a crafted SMB packet stream through an affected device. A successful exploit could allow the attacker to cause the Snort process to reload, resulting in a DoS condition.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Firepower Threat Defense Software

affected

Version	Status	Constraints
`7.1.0`	affected	—
`7.1.0.1`	affected	—
`7.1.0.2`	affected	—
`7.1.0.3`	affected	—
`7.2.0`	affected	—
`7.2.0.1`	affected	—
`7.2.1`	affected	—
`7.2.2`	affected	—
`7.2.3`	affected	—
`7.3.0`	affected	—
`7.3.1`	affected	—
`7.3.1.1`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.2:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.3:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.2:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.3:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.0:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1:::::::*
	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.1:::::::*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2023-24449	A vulnerability in the interaction between the Server Message Block (SMB) protocol preprocessor and the Snort 3 detection engine for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the configured policies or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error-checking when the Snort 3 detection engine is processing SMB traffic. An attacker could exploit this vulnerability by sending a crafted SMB packet stream through an affected device. A successful exploit could allow the attacker to cause the Snort process to reload, resulting in a DoS condition.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.885% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-smbsnort3-dos-pfOjOYUV

History

Aug 11, 2026 8:00 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco secure Firewall Threat Defense
CPEs	cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0.3:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.1.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.0.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.2:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.2.3:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.0:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.1.1:::::::* cpe:2.3:a:cisco:firepower_threat_defense:7.3.1:::::::*	cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.2:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0.3:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.1.0:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.0:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.2:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.2.3:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.0:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1.1:::::::* cpe:2.3:a:cisco:secure_firewall_threat_defense:7.3.1:::::::*
Vendors & Products	Cisco firepower Threat Defense	Cisco secure Firewall Threat Defense