Vulnerability in Cisco Cyber Vision
CVE-2026-20057
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (37.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Cisco Cyber Vision — versions 3.0.0, 3.0.2, 3.0.3
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 7.2.0, 7.2.0.1, 7.2.1
- Cisco Utd Snort Ips Engine Software — versions 17.12.1a, 17.12.2, 17.13.1a
- Cisco Cyber Vision — versions 3.0.0, 3.0.1, 3.0.2
- Cisco Secure Firewall Threat Defense — versions 7.2.0, 7.2.0.1, 7.2.1
- Cisco Snort
- Cisco Unified Threat Defense Snort Intrusion Prevention System Engine — versions 17.12.1a, 17.12.2, 17.12.3
Weakness classification (CWE)
References
- sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-… (Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20057?
- CVE-2026-20057 is a medium-severity vulnerability in Cisco Cyber Vision, classified under Divide By Zero. CVSS score: 5.8/10. Published 2026-03-04.
- How severe is CVE-2026-20057?
- Medium severity. CVSS v3 base score is 5.8 out of 10.