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CVE-2026-20054

Cisco Secure Firewall Threat Defense Software Snort 3 Visual Basic for Application Infinite Loop 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 error checking when decompressing VBA data. 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 the Snort 3 Detection Engine to enter an infinite loop, causing 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 3.17.1S; affected 16.12.3; affected Fuji-16.9.5; affected 16.12.4; affected 17.3.1a; affected 16.6.6; affected 16.12.2; affected Fuji-16.9.6; affected 3.17.0S; affected Fuji-16.9.3; affected Denali-16.3.7; affected Fuji-16.9.2; affected Fuji-16.9.4; affected Everest-16.6.4; affected Everest-16.6.3; affected 16.6.5; affected Denali-16.3.5; affected 17.2.1r; affected 17.1.1; affected Everest-16.6.2; affected 16.6.7a; affected Denali-16.3.4; affected 16.6.1; affected Denali-16.3.9; affected Denali-16.3.3; affected 16.12.1a; affected 17.3.2; affected 17.4.1a; affected 16.12.5; affected 17.5.1; affected Fuji-16.9.7; affected 16.6.9; affected 17.3.3; affected 17.5.1a; affected 17.3.4; affected 17.3.4a; affected 17.4.2; affected 17.4.1b; affected 17.6.1a; affected 16.6.10; affected 17.7.1a; affected 16.12.6; affected Fuji-16.9.8; affected 17.6.2; affected 17.8.1a; affected 16.12.7; affected 17.3.5; affected 17.6.3; affected 17.6.3a; affected 17.7.2; affected 17.9.1a; affected 17.6.4; affected 17.10.1a; affected 17.3.6; affected 16.12.8; affected 17.3.7; affected 17.9.2a; affected 17.6.5; affected 17.11.1a; affected 17.9.3a; affected 17.12.1a; affected 17.9.4; affected 17.6.6; affected 17.3.8; affected 17.3.8a; affected 17.6.6a; affected 17.9.4a; affected 17.12.2; affected 17.13.1a; affected 17.9.5a; affected 17.12.3; affected 17.6.7; affected 17.14.1a; affected 17.12.4; affected 17.12.3a; affected 17.15.1a; affected 17.6.8; affected 17.9.6; affected 17.6.8a; affected 17.16.1a; affected 17.9.5e; affected 17.12.4a; affected 17.15.2c; affected 17.9.5f; affected 17.12.4b; affected 17.15.2a; affected 17.12.5; affected 17.17.1; affected 17.12.5a; affected 17.9.7a; affected 17.15.3a; affected 17.15.3; affected 17.12.5b; affected 17.12.5c; affected 17.15.4; affected 17.9.7b; affected 17.18.1; affected 17.18.1a; affected 17.12.6; affected 17.9.8; affected 17.15.4c; affected 17.12.5d; affected 17.18.2

CWE

CWE-835

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.