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6.8Medium

Cisco Secure Firewall Management Center

CVE-2021-40114

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.

What this means for your business

  • It affects Cisco Secure Firewall Management Center. It matters if your company, or a supplier that handles your data, runs it.
  • An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.

What to do

  1. 1Check whether your company or your suppliers run Cisco Secure Firewall Management Center, and which version. The affected versions are listed further down this page.
  2. 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

Check if you’re exposedBook a call

Scoring

CVSS
6.8 (v3.1)
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
Weakness
CWE-770
Assigned by
psirt@cisco.com

Dates

Published
2021-10-27
Last modified
2026-08-11
Sources
NVD

Affected products

  • Cisco Secure Firewall Management Center2.9.14.0, 2.9.15, 2.9.16, 2.9.17
  • Cisco Secure Firewall Threat Defense- 6.4.0.12, 6.5.0 - 6.6.3, 6.7.0 - 6.7.0.2
  • Cisco Unified Threat Defense16.12 - 16.12.6, 17.3 - 17.3.4a, 17.4 - 17.4.2
  • Snort Snort2.0.0 - 2.9.18

As listed in the NVD configuration data. Not a statement about your estate.

References