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CVE-2026-20053

Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Heap Overflow Denial of Service Vulnerability PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Cisco / Cisco Cyber Visionaffected 3.0.0; affected 3.0.2; affected 3.0.3; affected 3.0.1; affected 3.1.0; affected 3.0.4; affected 3.1.1; affected 3.1.2; affected 3.2.0; affected 3.0.5; affected 3.2.1; affected 3.0.6; affected 3.2.2; affected 3.2.3; affected 3.2.4; affected 4.0.0; affected 4.0.1; affected 4.0.2; affected 4.0.3; affected 4.1.0; affected 4.1.1; affected 4.1.2; affected 4.1.3; affected 4.1.4; affected 4.2.0; affected 4.2.1; affected 4.1.5; affected 4.2.2; affected 4.2.X; affected 4.2.3; affected 4.2.4; affected 4.2.6; affected 4.1.6; affected 4.3.0; affected 4.3.1; affected 4.3.2; affected 4.3.3; affected 4.4.0; affected 4.4.1; affected 4.4.2; affected 4.4.3; affected 4.1.7; affected 5.0.0; affected 5.0.1; affected 5.0.2; affected 5.1.0; affected 5.1.1; affected 5.1.2; affected 5.1.3; affected 5.2.0; affected 5.2.1; affected 5.3.0; affected 5.3.1; affected 5.3.2
Cisco / Cisco Secure Firewall Threat Defense (FTD) Softwareaffected 7.2.0; affected 7.2.0.1; affected 7.2.1; affected 7.3.0; affected 7.2.2; affected 7.2.3; affected 7.3.1; affected 7.2.4; affected 7.2.5; affected 7.2.4.1; affected 7.3.1.1; affected 7.4.0; affected 7.2.5.1; affected 7.4.1; affected 7.2.6; affected 7.4.1.1; affected 7.2.7; affected 7.2.5.2; affected 7.3.1.2; affected 7.2.8; affected 7.6.0; affected 7.4.2; affected 7.2.8.1; affected 7.4.2.1; affected 7.2.9; affected 7.7.0; affected 7.4.2.2; affected 7.2.10; affected 7.6.1; affected 7.4.2.3; affected 7.6.2; affected 7.7.10; affected 7.6.2.1; affected 7.7.10.1; affected 7.4.2.4; affected 7.2.10.2; affected 7.4.3
Cisco / Cisco UTD SNORT IPS Engine Softwareaffected 17.12.1a; affected 17.9.4; affected 17.12.2; affected 17.13.1a; affected 17.12.3; affected 17.14.1a; affected 17.12.4; affected 17.12.3a; affected 17.15.1a; affected 17.16.1a; affected 17.9.5e; affected 17.12.4a; affected 17.15.2c; affected 17.12.4b; affected 17.15.2a; affected 17.12.5; affected 17.17.1; affected 17.12.5a; affected 17.15.3a; affected 17.15.3; affected 17.12.5b; affected 17.12.5c; affected 17.15.4; affected 17.18.1; affected 17.18.1a; affected 17.12.6; affected 17.15.4c; affected 17.12.5d; affected 17.18.2

CWE

CWE-122

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.