Vulnerability Intelligence Report
Multiple Cisco Products Snort 3 Generic File Processing Memory Exhaustion Denial of Service Vulnerability
CVE-2026-76489
Multiple Cisco products are affected by a vulnerability in the memory management implementation of Snort 3 that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when Snort 3 processes files, which could cause unreleased memory. An attacker could exploit this vulnerability by sending a large number of files to be processed. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition.
No Active Exploit Signals
CVSS Base Score
5.8
MEDIUM
Exploitability:3.9
Impact Score:1.5
EPSS Probability:0.32%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
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Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-401 ↗Missing Release of Memory after Effective Lifetime
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Cisco | Cisco Open Source Snort3 | 3.12.2.0 (affected), 3.1.2.0 (affected), 3.1.3.0 (affected), 3.1.4.0 (affected), 3.1.5.0 (affected), 3.1.6.0 (affected), 3.1.7.0 (affected), 3.1.8.0 (affected), 3.1.9.0 (affected), 3.1.10.0 (affected), 3.1.12.0 (affected), 3.1.13.0 (affected), 3.1.14.0 (affected), 3.1.15.0 (affected), 3.1.16.0 (affected), 3.1.17.0 (affected), 3.1.18.0 (affected), 3.1.19.0 (affected), 3.1.20.0 (affected), 3.1.21.0 (affected), 3.1.22.0 (affected), 3.1.23.0 (affected), 3.1.24.0 (affected), 3.1.25.0 (affected), 3.1.27.0 (affected), 3.1.28.0 (affected), 3.1.29.0 (affected), 3.1.30.0 (affected), 3.1.31.0 (affected), 3.1.32.0 (affected), 3.1.36.0 (affected), 3.1.38.0 (affected), 3.1.39.0 (affected), 3.1.40.0 (affected), 3.1.41.0 (affected), 3.1.42.0 (affected), 3.1.43.0 (affected), 3.1.45.0 (affected), 3.1.47.0 (affected), 3.1.48.0 (affected), 3.1.50.0 (affected), 3.1.51.0 (affected), 3.1.52.0 (affected), 3.1.53.0 (affected), 3.1.55.0 (affected), 3.1.56.0 (affected), 3.1.57.0 (affected), 3.1.58.0 (affected), 3.1.59.0 (affected), 3.1.60.0 (affected), 3.1.61.0 (affected), 3.1.62.0 (affected), 3.1.63.0 (affected), 3.1.64.0 (affected), 3.1.65.0 (affected), 3.1.66.0 (affected), 3.1.67.0 (affected), 3.1.69.0 (affected), 3.1.70.0 (affected), 3.1.71.0 (affected), 3.1.72.0 (affected), 3.1.73.0 (affected), 3.1.74.0 (affected), 3.1.75.0 (affected), 3.1.76.0 (affected), 3.1.77.0 (affected), 3.1.78.0 (affected), 3.1.81.0 (affected), 3.1.82.0 (affected), 3.1.83.0 (affected), 3.1.84.0 (affected), 3.2.1.0 (affected), 3.2.2.0 (affected), 3.3.0.0 (affected), 3.3.1.0 (affected), 3.3.2.0 (affected), 3.3.3.0 (affected), 3.3.4.0 (affected), 3.3.5.0 (affected), 3.3.7.0 (affected), 3.5.0.0 (affected), 3.5.1.0 (affected), 3.8.1.0 (affected), 3.6.0.0 (affected), 3.6.2.0 (affected), 3.9.3.0 (affected), 3.7.2.0 (affected), 3.7.0.0 (affected), 3.9.6.0 (affected), 3.10.0.0 (affected), 3.10.2.0 (affected), 3.7.4.0 (affected), 3.9.0.0 (affected), 3.5.2.0 (affected), 3.12.1.0 (affected), 3.6.1.0 (affected), 3.9.2.0 (affected), 3.6.3.0 (affected), 3.9.5.0 (affected), 3.7.1.0 (affected), 3.9.7.0 (affected), 3.7.3.0 (affected), 3.10.1.0 (affected), 3.9.1.0 (affected), 3.11.1.0 (affected) |
| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | 7.0.0 (affected), 7.0.0.1 (affected), 7.0.1 (affected), 7.0.1.1 (affected), 7.0.2 (affected), 7.2.0 (affected), 7.0.2.1 (affected), 7.0.3 (affected), 7.2.0.1 (affected), 7.0.4 (affected), 7.2.1 (affected), 7.0.5 (affected), 7.3.0 (affected), 7.2.2 (affected), 7.2.3 (affected), 7.3.1 (affected), 7.2.4 (affected), 7.0.6 (affected), 7.2.5 (affected), 7.2.4.1 (affected), 7.3.1.1 (affected), 7.4.0 (affected), 7.0.6.1 (affected), 7.2.5.1 (affected), 7.4.1 (affected), 7.2.6 (affected), 7.0.6.2 (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), 7.0.6.3 (affected), 7.4.2.1 (affected), 7.2.9 (affected), 7.0.7 (affected), 7.7.0 (affected), 7.4.2.2 (affected), 7.6.1 (affected), 7.4.2.3 (affected), 7.0.8 (affected), 7.6.2 (affected), 7.7.10 (affected), 7.7.11 (affected), 7.0.8.1 (affected), 7.6.2.1 (affected), 7.7.10.1 (affected), 7.4.2.4 (affected), 7.4.3 (affected), 7.6.4 (affected), 10.0.0 (affected), 7.4.4 (affected), 7.0.9 (affected), 7.4.7 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.316%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Cisco Systems, Inc. · Hosted Service · USA |
| Reserved | 2026-08-19T12:02:03 |
| Published | 2026-10-21T16:17:23 |
| Last Updated | 2026-10-22T19:11:31 |
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