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ReviewHigh

CVE-2021-40114

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

Multiple Cisco products are affected by a vulnerability in the way the Snort detection engine processes ICMP traffic 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 memory resource management while the Snort detection engine is processing ICMP packets. An attacker could exploit this vulnerability by sending a series of ICMP packets through an affected device. A successful exploit could allow the attacker to exhaust resources on the affected device, causing the device to reload.

CVSS
7.5
EPSS
2.44%
83.2% 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 probability2.44%
Technical severityCVSS 7.5

Vulnerability overview

Multiple Cisco products are affected by a vulnerability in the way the Snort detection engine processes ICMP traffic 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 memory resource management while the Snort detection engine is processing ICMP packets. An attacker could exploit this vulnerability by sending a series of ICMP packets through an affected device. A successful exploit could allow the attacker to exhaust resources on the affected device, causing the device to reload.

Affected product and versions

Product
Cisco Cisco Firepower Threat Defense Software, secure firewall management center, secure firewall threat defense
Affected versions
2.9.14.0, 2.9.15, 2.9.16, 2.9.17, < 6.4.0.12, >= 6.5.0 < 6.6.3, >= 6.7.0 < 6.7.0.2, >= 16.12 < 16.12.6, >= 17.3 < 17.3.4a, >= 17.4 < 17.4.2, >= 2.0.0 < 2.9.18
Fixed versions
6.4.0.12, 6.6.3, 6.7.0.2, 16.12.6, 17.3.4a, 17.4.2, 2.9.18

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-401, CWE-770