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Vulnerability record · CVE-2026-20057 · published 4 March 2026

CVE-2026-20057: Cisco snort divide by zero vulnerability

Cisco · Snort

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.

5.8 CVSS 3.1 Medium EPSS 0.43% · top 64.9% CWE-369 · Divide by zero
5.8CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
1References
20 Aug 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVed Vendor AdvisoryMitigation

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Source: NIST National Vulnerability Database (record CVE-2026-20057), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.