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 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.

• cisco snort (>= 3.0.0-233 < 3.9.3.0) • cisco cyber vision 3.0.0 • cisco cyber vision 3.0.1 • cisco cyber vision 3.0.2 • cisco cyber vision 3.0.3 • cisco cyber vision 3.0.4 • cisco cyber vision 3.0.5 • cisco cyber vision 3.0.6 • cisco cyber vision 3.1.0 • cisco cyber vision 3.1.1 • cisco cyber vision 3.1.2 • cisco cyber vision 3.2.0 • cisco cyber vision 3.2.1 • cisco cyber vision 3.2.2 • cisco cyber vision 3.2.3 • cisco cyber vision 3.2.4 • cisco cyber vision 4.0.0 • cisco cyber vision 4.0.1 • cisco cyber vision 4.0.2 • cisco cyber vision 4.0.3 • cisco cyber vision 4.1.0 • cisco cyber vision 4.1.1 • cisco cyber vision 4.1.2 • cisco cyber vision 4.1.3 • cisco cyber vision 4.1.4 • cisco cyber vision 4.1.5 • cisco cyber vision 4.1.6 • cisco cyber vision 4.1.7 • cisco cyber vision 4.2.0 • cisco cyber vision 4.2.1 • cisco cyber vision 4.2.2 • cisco cyber vision 4.2.3 • cisco cyber vision 4.2.4 • cisco cyber vision 4.2.6 • cisco cyber vision 4.3.0 • cisco cyber vision 4.3.1 • cisco cyber vision 4.3.2 • cisco cyber vision 4.3.3 • cisco cyber vision 4.4.0 • cisco cyber vision 4.4.1 • cisco cyber vision 4.4.2 • cisco cyber vision 4.4.3 • cisco cyber vision 5.0.0 • cisco cyber vision 5.0.1 • cisco cyber vision 5.0.2 • cisco cyber vision 5.1.0 • cisco cyber vision 5.1.1 • cisco cyber vision 5.1.2 • cisco cyber vision 5.1.3 • cisco cyber vision 5.2.0 • cisco cyber vision 5.2.1 • cisco cyber vision 5.3.0 • cisco cyber vision 5.3.1 • cisco cyber vision 5.3.2 • cisco secure firewall threat defense 7.2.0 • cisco secure firewall threat defense 7.2.0.1 • cisco secure firewall threat defense 7.2.1 • cisco secure firewall threat defense 7.2.2 • cisco secure firewall threat defense 7.2.3 • cisco secure firewall threat defense 7.2.4 … and 60 more