CVE-2026-20026
Multiple Cisco Products Snort 3 DCERPC Vulnerabilities
Published Jan 7, 2026
CVSS 3.1 · 5.8 Medium
EPSS < 1%
KEV · Not listed
Description
Multiple Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection.
This vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer use-after-free read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to unexpectedly restart the Snort 3 Detection Engine, which could cause a denial of service (DoS).
This vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer use-after-free read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to unexpectedly restart the Snort 3 Detection Engine, which could cause a denial of service (DoS).
Affected Products
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CVE record
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NVD configurations
No data
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Red Hat packages
No data
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OpenCVE enrichment
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | unknown |
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| Cisco | Cisco UTD SNORT IPS Engine Software | unknown |
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No data.
No data.
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Secure Firewall Threat Defense | — |
| Cisco | Snort | — |
| Cisco | Utd Snort Ips Engine Software | — |
Remediation
Tracking
Advisories
Metrics
No CVSS v4.0
Attack Vector Network
Attack Complexity Low
Privileges Required None
Scope Changed
Confidentiality Impact None
Integrity Impact None
Availability Impact Low
User Interaction None
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.666% probability within 30 days)
Exploitation none
Automatable yes
Technical Impact partial
References
History
Jan 8, 2026 10:00 AM
First appearance in the feed. Affected vendors updated
View changes
| Type | Values Removed | Values Added |
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| First Time appeared |
Cisco
Cisco secure Firewall Threat Defense Cisco snort Cisco utd Snort Ips Engine Software |
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| Vendors & Products |
Cisco
Cisco secure Firewall Threat Defense Cisco snort Cisco utd Snort Ips Engine Software |
Jan 7, 2026 5:15 PM
Scoring metrics updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Jan 7, 2026 4:30 PM
Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Multiple Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer use-after-free read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to unexpectedly restart the Snort 3 Detection Engine, which could cause a denial of service (DoS). | |
| Title | Multiple Cisco Products Snort 3 DCERPC Vulnerabilities | |
| Weaknesses | CWE-415 | |
| References |
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| Metrics |
cvssV3_1
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Subscriptions
Weaknesses
