CVE-2026-20053Multiple 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.
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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.
- CVSS
- 5.8 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
- Weakness (CWE)
- CWE-122
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Aug 20, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cisco snort cisco:snort | from 3.0.0-233 before 3.9.3.0 | NVD |
cisco cyber_vision cisco:cyber_vision | 3.0.0; 3.0.1; 3.0.2; 3.0.3; 3.0.4; 3.0.5; 3.0.6; 3.1.0; and 45 more ranges | NVD |
cisco secure_firewall_threat_defense cisco:secure_firewall_threat_defense | 7.2.0; 7.2.0.1; 7.2.1; 7.2.2; 7.2.3; 7.2.4; 7.2.4.1; 7.2.5; and 29 more ranges | NVD |
cisco unified_threat_defense_snort_intrusion_prevention_system_engine cisco:unified_threat_defense_snort_intrusion_prevention_system_engine | 17.9.4; 17.9.5e; 17.12.1a; 17.12.2; 17.12.3; 17.12.3a; 17.12.4; 17.12.4a; and 21 more ranges | NVD |
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort3-vbavuls-96UcVVedvendor-advisory, mitigation
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.