CVE-2026-20054
Denial of Service in Cisco Snort 3 via VBA Decompression
Publication date: 2026-03-04
Last updated on: 2026-03-04
Assigner: Cisco Systems, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| cisco | snort_3 | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-835 | The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects multiple Cisco products that use the Snort 3 VBA feature. It arises from improper error checking when decompressing VBA data. An unauthenticated, remote attacker can exploit this by sending specially crafted VBA data to the Snort 3 Detection Engine on the targeted device.
If successfully exploited, the Snort 3 Detection Engine could crash or enter an infinite loop, leading to a denial-of-service (DoS) condition.
How can this vulnerability impact me? :
The primary impact of this vulnerability is a denial-of-service (DoS) condition on devices running the Snort 3 Detection Engine. An attacker can cause the engine to crash or become unresponsive by sending crafted VBA data.
This could disrupt network security monitoring and intrusion detection capabilities, potentially leaving the network unprotected or blind to other attacks during the downtime.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know