CVE-2024-20342

Cisco Firepower Threat Defense Software Rate Filter Bypass Vulnerability

HIGH

8.6

CVSS Score

Published: October 23, 2024 at 05:09 PM UTC

Updated: August 11, 2026 at 07:40 PM UTC

3 products affected across 1 vendorSecure Firewall Threat DefenseSnort++Firepower Threat Defense

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Severity

HIGH8.6

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

Description

Multiple Cisco products are affected by a vulnerability in the rate filtering feature of the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured rate limiting filter.  This vulnerability is due to an incorrect connection count comparison. An attacker could exploit this vulnerability by sending traffic through an affected device at a rate that exceeds a configured rate filter. A successful exploit could allow the attacker to successfully bypass the rate filter. This could allow unintended traffic to enter the network protected by the affected device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Secure Firewall Threat Defense · Cisco

95%

v < 7.0.6.27.2.0 ≤ v < 7.2.67.4.0 ≤ v < 7.4.27.1.0 7.3.0

Affected range stops below 7.0.6.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.2.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.4.2, so it looks safe — our inference, not a vendor statement

Snort++· Cisco

95%

3.0.0.0 ≤ v < 3.1.74.0

Affected range stops below 3.1.74.0, so it looks safe — our inference, not a vendor statement

Firepower Threat Defense · Cisco

60%

6.7.0 ≤ v ≤ 7.4.1.16.7.0 7.0.0 7.0.0.1 7.0.1 7.0.1.1 7.0.2 7.0.2.1 7.0.3 7.0.4 7.0.5 7.0.6 7.0.6.1 7.1.0 7.1.0.1 7.1.0.2 7.1.0.3 7.2.0 7.2.0.1 7.2.1 7.2.2 7.2.3 7.2.4 7.2.4.1 7.2.5 7.2.5.1 7.2.5.2 7.3.0 7.3.1 7.3.1.1 7.3.1.2 7.4.0 7.4.1 7.4.1.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-rf-bypass-OY8f3pnM

References (1)

Vendor Advisory

Source: [email protected]

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-rf-bypass-OY8f3pnM

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: CHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-1025

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