CVE-2026-20068: Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability

Published Mar 4, 2026
·
Updated

Multiple Cisco products are affected by a vulnerability in the Snort 3 detection engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when parsing remote procedure call (RPC) data. An attacker could exploit this vulnerability by sending crafted RPC packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.

Affected Software

154 affected components
Cisco Snort 3
Cisco Snort>=3.0.0-233<3.9.2.0
Cisco Cyber Vision=3.0.0
Cisco Cyber Vision=3.0.1
Cisco Cyber Vision=3.0.2
Cisco Cyber Vision=3.0.3
Cisco Cyber Vision=3.0.4
Cisco Cyber Vision=3.0.5
Cisco Cyber Vision=3.0.6
Cisco Cyber Vision=3.1.0
Cisco Cyber Vision=3.1.1
Cisco Cyber Vision=3.1.2
Cisco Cyber Vision=3.2.0
Cisco Cyber Vision=3.2.1
Cisco Cyber Vision=3.2.2
Cisco Cyber Vision=3.2.3
Cisco Cyber Vision=3.2.4
Cisco Cyber Vision=4.0.0
Cisco Cyber Vision=4.0.1
Cisco Cyber Vision=4.0.2
Cisco Cyber Vision=4.0.3
Cisco Cyber Vision=4.1.0
Cisco Cyber Vision=4.1.1
Cisco Cyber Vision=4.1.2
Cisco Cyber Vision=4.1.3
Cisco Cyber Vision=4.1.4
Cisco Cyber Vision=4.1.5
Cisco Cyber Vision=4.1.6
Cisco Cyber Vision=4.1.7
Cisco Cyber Vision=4.2.0
Cisco Cyber Vision=4.2.1
Cisco Cyber Vision=4.2.2
Cisco Cyber Vision=4.2.3
Cisco Cyber Vision=4.2.4
Cisco Cyber Vision=4.2.6
Cisco Cyber Vision=4.3.0
Cisco Cyber Vision=4.3.1
Cisco Cyber Vision=4.3.2
Cisco Cyber Vision=4.3.3
Cisco Cyber Vision=4.4.0
Cisco Cyber Vision=4.4.1
Cisco Cyber Vision=4.4.2
Cisco Cyber Vision=4.4.3
Cisco Cyber Vision=5.0.0
Cisco Cyber Vision=5.0.1
Cisco Cyber Vision=5.0.2
Cisco Cyber Vision=5.1.0
Cisco Cyber Vision=5.1.1
Cisco Cyber Vision=5.1.2
Cisco Cyber Vision=5.1.3
Cisco Cyber Vision=5.2.0
Cisco Cyber Vision=5.2.1
Cisco Cyber Vision=5.3.0
Cisco Cyber Vision=5.3.1
Cisco Cyber Vision=5.3.2
Cisco Secure Firewall Threat Defense=7.2.4
Cisco Secure Firewall Threat Defense=7.2.4.1
Cisco Secure Firewall Threat Defense=7.2.5
Cisco Secure Firewall Threat Defense=7.2.5.1
Cisco Secure Firewall Threat Defense=7.2.5.2
Cisco Secure Firewall Threat Defense=7.2.6
Cisco Secure Firewall Threat Defense=7.2.7
Cisco Secure Firewall Threat Defense=7.2.8
Cisco Secure Firewall Threat Defense=7.2.8.1
Cisco Secure Firewall Threat Defense=7.2.9
Cisco Secure Firewall Threat Defense=7.2.10
Cisco Secure Firewall Threat Defense=7.2.10.2
Cisco Secure Firewall Threat Defense=7.4.0
Cisco Secure Firewall Threat Defense=7.4.1
Cisco Secure Firewall Threat Defense=7.4.1.1
Cisco Secure Firewall Threat Defense=7.4.2
Cisco Secure Firewall Threat Defense=7.4.2.1
Cisco Secure Firewall Threat Defense=7.4.2.2
Cisco Secure Firewall Threat Defense=7.4.2.3
Cisco Secure Firewall Threat Defense=7.4.2.4
Cisco Secure Firewall Threat Defense=7.4.3
Cisco Secure Firewall Threat Defense=7.6.0
Cisco Secure Firewall Threat Defense=7.6.1
Cisco Secure Firewall Threat Defense=7.6.2
Cisco Secure Firewall Threat Defense=7.6.2.1
Cisco Secure Firewall Threat Defense=7.7.0
Cisco Secure Firewall Threat Defense=7.7.10
Cisco Secure Firewall Threat Defense=7.7.10.1
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.2.1r
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.3.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.3.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.3.3
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.3.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.3.4a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.3.5
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.3.6
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.3.7
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.3.8
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.3.8a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.4.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.4.1b
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.4.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.5.1
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.5.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.3
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.3a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.5
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.6
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.6a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.7
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.8
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.6.8a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.7.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.7.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.8.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.2a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.3a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.4a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.5a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.5e
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.5f
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.6
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.7a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.7b
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.9.8
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.10.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.11.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.2
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.3
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.3a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.4a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.4b
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.5
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.5a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.5b
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.5c
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.5d
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.12.6
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.13.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.14.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.15.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.15.2a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.15.2c
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.15.3
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.15.3a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.15.4
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.15.4c
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.16.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.17.1
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.18.1
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.18.1a
Cisco Unified Threat Defense Snort Intrusion Prevention System Engine=17.18.2

Event History

Mar 4, 2026
CVE Published
via MITRE·05:49 PM
Data Sourced
via MITRE·05:49 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·06:16 PM
DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2026-20068?

The severity of CVE-2026-20068 is considered high, as it allows an unauthenticated remote attacker to cause a denial of service.

2

How do I fix CVE-2026-20068?

To fix CVE-2026-20068, update the Cisco Snort 3 software to the latest version provided by Cisco.

3

What types of attacks can exploit CVE-2026-20068?

CVE-2026-20068 can be exploited by an unauthenticated remote attacker to restart the Snort 3 detection engine.

4

How does CVE-2026-20068 impact network security?

CVE-2026-20068 impacts network security by potentially interrupting packet inspection and detection capabilities offered by the Snort 3 engine.

5

Are there any workarounds for CVE-2026-20068?

Currently, there are no documented workarounds for CVE-2026-20068 besides upgrading the software to a patched version.

Company

Resources

Contact

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