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ReviewHigh

CVE-2021-40116

Cisco Cisco Firepower Threat Defense Software, secure firewall management center, secure firewall threat defense

Multiple Cisco products are affected by a vulnerability in Snort rules that 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 Block with Reset or Interactive Block with Reset actions if a rule is configured without proper constraints. An attacker could exploit this vulnerability by sending a crafted IP packet to the affected device. A successful exploit could allow the attacker to cause through traffic to be dropped. Note: Only products with Snort3 configured and either a ru...

CVSS
7.5
EPSS
1.39%
70.5% percentile
CISA KEV
Not listed
Published
2021.10.28
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability1.39%
Technical severityCVSS 7.5

Vulnerability overview

Multiple Cisco products are affected by a vulnerability in Snort rules that 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 Block with Reset or Interactive Block with Reset actions if a rule is configured without proper constraints. An attacker could exploit this vulnerability by sending a crafted IP packet to the affected device. A successful exploit could allow the attacker to cause through traffic to be dropped. Note: Only products with Snort3 configured and either a ru...

Affected product and versions

Product
Cisco Cisco Firepower Threat Defense Software, secure firewall management center, secure firewall threat defense
Affected versions
3.1.0.1, >= 6.4.0 < 6.4.0.13, >= 6.6.0 < 6.6.5.1, >= 6.7.0 < 6.7.0.3, >= 7.0.0 < 7.0.1, >= 3.0.0.0 < 3.1.0.100
Fixed versions
6.4.0.13, 6.6.5.1, 6.7.0.3, 7.0.1, 3.1.0.100

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Cisco Cisco Firepower Threat Defense Software, secure firewall management center, secure firewall threat defense and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 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-241