This vulnerability is due to a lack of error checking when the MIME fields of the SMTP header are parsed. An attacker could exploit this vulnerability by sending crafted SMTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts.
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Affected Vendors & Products
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Solution
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Wed, 21 Oct 2026 17:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Multiple Cisco products are affected by a vulnerability in the Snort 3 SMTP MIME Decoder that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart. This vulnerability is due to a lack of error checking when the MIME fields of the SMTP header are parsed. An attacker could exploit this vulnerability by sending crafted SMTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts. | |
| Title | Multiple Cisco Products Snort 3 SMTP MIME Denial of Service Vulnerability | |
| Weaknesses | CWE-805 | |
| References |
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| Metrics |
cvssV3_1
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Projects
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MITRE
Status: PUBLISHED
Assigner: cisco
Published:
Updated: 2026-10-21T16:12:19.429Z
Reserved: 2025-10-08T11:59:15.350Z
Link: CVE-2026-20011
Vulnrichment
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NVD
Status : Awaiting Analysis
Published: 2026-10-21T17:18:26.640
Modified: 2026-10-21T18:54:37.403
Link: CVE-2026-20011
Redhat
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OpenCVE Enrichment
Updated: 2026-10-21T20:45:14Z