Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash.

This vulnerability is due to improper range checking when decompressing VBA data, which is user controlled. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause an overflow of heap data, which could cause a DoS condition.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco Cyber Vision unknown
Version Status Constraints
3.0.0 affected —
3.0.2 affected —
3.0.3 affected —
3.0.1 affected —
3.1.0 affected —
3.0.4 affected —
3.1.1 affected —
3.1.2 affected —
3.2.0 affected —
3.0.5 affected —
3.2.1 affected —
3.0.6 affected —
3.2.2 affected —
3.2.3 affected —
3.2.4 affected —
4.0.0 affected —
4.0.1 affected —
4.0.2 affected —
4.0.3 affected —
4.1.0 affected —
4.1.1 affected —
4.1.2 affected —
4.1.3 affected —
4.1.4 affected —
4.2.0 affected —
4.2.1 affected —
4.1.5 affected —
4.2.2 affected —
4.2.X affected —
4.2.3 affected —
4.2.4 affected —
4.2.6 affected —
4.1.6 affected —
4.3.0 affected —
4.3.1 affected —
4.3.2 affected —
4.3.3 affected —
4.4.0 affected —
4.4.1 affected —
4.4.2 affected —
4.4.3 affected —
4.1.7 affected —
5.0.0 affected —
5.0.1 affected —
5.0.2 affected —
5.1.0 affected —
5.1.1 affected —
5.1.2 affected —
5.1.3 affected —
5.2.0 affected —
5.2.1 affected —
5.3.0 affected —
5.3.1 affected —
5.3.2 affected —
Cisco Cisco Secure Firewall Threat Defense (FTD) Software unknown
Version Status Constraints
7.2.0 affected —
7.2.0.1 affected —
7.2.1 affected —
7.3.0 affected —
7.2.2 affected —
7.2.3 affected —
7.3.1 affected —
7.2.4 affected —
7.2.5 affected —
7.2.4.1 affected —
7.3.1.1 affected —
7.4.0 affected —
7.2.5.1 affected —
7.4.1 affected —
7.2.6 affected —
7.4.1.1 affected —
7.2.7 affected —
7.2.5.2 affected —
7.3.1.2 affected —
7.2.8 affected —
7.6.0 affected —
7.4.2 affected —
7.2.8.1 affected —
7.4.2.1 affected —
7.2.9 affected —
7.7.0 affected —
7.4.2.2 affected —
7.2.10 affected —
7.6.1 affected —
7.4.2.3 affected —
7.6.2 affected —
7.7.10 affected —
7.6.2.1 affected —
7.7.10.1 affected —
7.4.2.4 affected —
7.2.10.2 affected —
7.4.3 affected —
Cisco Cisco UTD SNORT IPS Engine Software unknown
Version Status Constraints
17.12.1a affected —
17.9.4 affected —
17.12.2 affected —
17.13.1a affected —
17.12.3 affected —
17.14.1a affected —
17.12.4 affected —
17.12.3a affected —
17.15.1a affected —
17.16.1a affected —
17.9.5e affected —
17.12.4a affected —
17.15.2c affected —
17.12.4b affected —
17.15.2a affected —
17.12.5 affected —
17.17.1 affected —
17.12.5a affected —
17.15.3a affected —
17.15.3 affected —
17.12.5b affected —
17.12.5c affected —
17.15.4 affected —
17.18.1 affected —
17.18.1a affected —
17.12.6 affected —
17.15.4c affected —
17.12.5d affected —
17.18.2 affected —

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed cve-icon cve-icon
History

Wed, 04 Mar 2026 18:00:00 +0000

Type Values Removed Values Added
Description Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. This vulnerability is due to improper range checking when decompressing VBA data, which is user controlled. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A successful exploit could allow the attacker to cause an overflow of heap data, which could cause a DoS condition.
Title Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Heap Overflow Denial of Service Vulnerability
Weaknesses CWE-122
References
Metrics cvssV3_1

{'score': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-03-04T17:46:58.213Z

Reserved: 2025-10-08T11:59:15.355Z

Link: CVE-2026-20053

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-04T18:16:19.607

Modified: 2026-03-04T18:16:19.607

Link: CVE-2026-20053

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses