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.

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According to its self-reported version, Cisco Secure Firewall Threat Defense (FTD) Software is affected by multiple vulnerabilities.

  - 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. (CVE-2026-20053)

  - 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 handling of VBA data during decompression. 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 the Snort 3 Detection Engine to unexpectedly restart, causing a DoS     condition. (CVE-2026-20054)

  - Multiple Cisco products are affected by a vulnerability in the Snort 3 Visual Basic for Applications (VBA)     feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to     crash. This vulnerability is due to lack of proper error checking when decompressing VBA data. 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 the Snort 3 Detection Engine to     unexpectedly restart, causing a DoS condition. (CVE-2026-20057)

  - Multiple Cisco products are affected by vulnerabilities in the Snort 3 VBA feature that could allow an     unauthenticated, remote attacker to cause the Snort 3 Detection Engine to crash. These vulnerabilities are     due to improper error checking when decompressing VBA data. An attacker could exploit these     vulnerabilities by sending crafted VBA data to the Snort 3 Detection Engine on the targeted device. A     successful exploit could allow the attacker to cause the Snort 3 Detection Engine to unexpectedly restart,     causing a DoS condition. (CVE-2026-20058)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

According to its self-reported version, Cisco ASA Software is affected by multiple vulnerabilities.

  - 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. (CVE-2026-20053)

  - Multiple Cisco products are affected by a vulnerability in the Snort 3 Visual Basic for Applications (VBA)     feature which could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to     crash.  This vulnerability is due to lack of proper error checking when decompressing VBA     data. An attacker could exploit this vulnerability by sending a crafted VBA data to the Snort 3 Detection     Engine on the targeted device. A successful exploit could allow the attacker to cause the Snort 3     Detection Engine to unexpectedly restart causing a a denial of service (DoS) condition. (CVE-2026-20057)

  - Multiple Cisco products are affected by a vulnerability in the Snort 3 VBA feature that could...
    (CVE-2026-20054)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

ID	Name	Product	Family	Severity
311459	Multiple Cisco Products Snort 3 VBA Decompression DoS (cisco-sa-ftd-snort3-vbavuls-96UcVVed)	Nessus	CISCO	medium
301697	Multiple Cisco Products Snort 3 Visual Basic for Applications DoS Vulnerabilities (cisco-sa-ftd-snort3-vbavuls-96UcVVed_CVE-2026-20053_CVE-2026-20054_CVE-2026-20057)	Nessus	CISCO	medium

Detections

Analytics

CVE-2026-20053

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Tenable Plugins

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