Medium
Multiple Cisco Products Snort 3 SMTP MIME Denial of Service Vulnerability
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.
Announced Group revision 1
Original source ↗CVE-2026-20011
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-20011
Cisco Open Source Snort3
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Cisco Secure Firewall Threat Defense (FTD) Software
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Cisco UTD SNORT IPS Engine Software
Source reference: /containers/cna/affected/2/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Cisco",
"product": "Cisco Open Source Snort3",
"versions": [
{
"status": "affected",
"version": "3.1.2.0"
},
{
"status": "affected",
"version": "3.1.3.0"
},
{
"status": "affected",
"version": "3.1.4.0"
},
{
"status": "affected",
"version": "3.1.5.0"
},
{
"status": "affected",
"version": "3.1.6.0"
},
{
"status": "affected",
"version": "3.1.7.0"
},
{
"status": "affected",
"version": "3.1.8.0"
},
{
"status": "affected",
"version": "3.1.9.0"
},
{
"status": "affected",
"version": "3.1.10.0"
},
{
"status": "affected",
"version": "3.1.12.0"
},
{
"status": "affected",
"version": "3.1.13.0"
},
{
"status": "affected",
"version": "3.1.14.0"
},
{
"status": "affected",
"version": "3.1.15.0"
},
{
"status": "affected",
"version": "3.1.16.0"
},
{
"status": "affected",
"version": "3.1.17.0"
},
{
"status": "affected",
"version": "3.1.18.0"
},
{
"status": "affected",
"version": "3.1.19.0"
},
{
"status": "affected",
"version": "3.1.20.0"
},
{
"status": "affected",
"version": "3.1.21.0"
},
{
"status": "affected",
"version": "3.1.22.0"
},
{
"status": "affected",
"version": "3.1.23.0"
},
{
"status": "affected",
"version": "3.1.24.0"
},
{
"status": "affected",
"version": "3.1.25.0"
},
{
"status": "affected",
"version": "3.1.27.0"
},
{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
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{
"status": "affected",
"version": "3.1.36.0"
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{
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{
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{
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{
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"version": "3.1.41.0"
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{
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{
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{
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{
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{
"status": "affected",
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{
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"version": "3.1.50.0"
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{
"status": "affected",
"version": "3.1.51.0"
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{
"status": "affected",
"version": "3.1.52.0"
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{
"status": "affected",
"version": "3.1.53.0"
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{
"status": "affected",
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{
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{
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{
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{
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{
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{
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"version": "3.1.62.0"
},
{
"status": "affected",
"version": "3.1.63.0"
},
{
"status": "affected",
"version": "3.1.64.0"
},
{
"status": "affected",
"version": "3.1.65.0"
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{
"status": "affected",
"version": "3.1.66.0"
},
{
"status": "affected",
"version": "3.1.67.0"
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{
"status": "affected",
"version": "3.1.69.0"
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{
"status": "affected",
"version": "3.1.70.0"
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{
"status": "affected",
"version": "3.1.71.0"
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{
"status": "affected",
"version": "3.1.72.0"
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{
"status": "affected",
"version": "3.1.73.0"
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{
"status": "affected",
"version": "3.1.74.0"
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{
"status": "affected",
"version": "3.1.75.0"
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{
"status": "affected",
"version": "3.1.76.0"
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{
"status": "affected",
"version": "3.1.77.0"
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{
"status": "affected",
"version": "3.1.78.0"
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{
"status": "affected",
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{
"status": "affected",
"version": "3.1.82.0"
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{
"status": "affected",
"version": "3.1.83.0"
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{
"status": "affected",
"version": "3.1.84.0"
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{
"status": "affected",
"version": "3.2.1.0"
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{
"status": "affected",
"version": "3.2.2.0"
},
{
"status": "affected",
"version": "3.3.0.0"
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{
"status": "affected",
"version": "3.3.1.0"
},
{
"status": "affected",
"version": "3.3.2.0"
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{
"status": "affected",
"version": "3.3.3.0"
},
{
"status": "affected",
"version": "3.3.4.0"
},
{
"status": "affected",
"version": "3.3.5.0"
},
{
"status": "affected",
"version": "3.3.7.0"
},
{
"status": "affected",
"version": "3.5.0.0"
},
{
"status": "affected",
"version": "3.5.1.0"
},
{
"status": "affected",
"version": "3.8.1.0"
},
{
"status": "affected",
"version": "3.6.0.0"
},
{
"status": "affected",
"version": "3.6.2.0"
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{
"status": "affected",
"version": "3.9.3.0"
},
{
"status": "affected",
"version": "3.7.2.0"
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{
"status": "affected",
"version": "3.7.0.0"
},
{
"status": "affected",
"version": "3.9.6.0"
},
{
"status": "affected",
"version": "3.10.0.0"
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{
"status": "affected",
"version": "3.7.4.0"
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{
"status": "affected",
"version": "3.9.0.0"
},
{
"status": "affected",
"version": "3.5.2.0"
},
{
"status": "affected",
"version": "3.6.1.0"
},
{
"status": "affected",
"version": "3.9.2.0"
},
{
"status": "affected",
"version": "3.6.3.0"
},
{
"status": "affected",
"version": "3.9.5.0"
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{
"status": "affected",
"version": "3.7.1.0"
},
{
"status": "affected",
"version": "3.9.7.0"
},
{
"status": "affected",
"version": "3.7.3.0"
},
{
"status": "affected",
"version": "3.9.1.0"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Cisco",
"product": "Cisco Secure Firewall Threat Defense (FTD) Software",
"versions": [
{
"status": "affected",
"version": "7.0.0"
},
{
"status": "affected",
"version": "7.0.0.1"
},
{
"status": "affected",
"version": "7.0.1"
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{
"status": "affected",
"version": "7.0.1.1"
},
{
"status": "affected",
"version": "7.0.2"
},
{
"status": "affected",
"version": "7.2.0"
},
{
"status": "affected",
"version": "7.0.2.1"
},
{
"status": "affected",
"version": "7.0.3"
},
{
"status": "affected",
"version": "7.2.0.1"
},
{
"status": "affected",
"version": "7.0.4"
},
{
"status": "affected",
"version": "7.2.1"
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{
"status": "affected",
"version": "7.0.5"
},
{
"status": "affected",
"version": "7.3.0"
},
{
"status": "affected",
"version": "7.2.2"
},
{
"status": "affected",
"version": "7.2.3"
},
{
"status": "affected",
"version": "7.3.1"
},
{
"status": "affected",
"version": "7.2.4"
},
{
"status": "affected",
"version": "7.0.6"
},
{
"status": "affected",
"version": "7.2.5"
},
{
"status": "affected",
"version": "7.2.4.1"
},
{
"status": "affected",
"version": "7.3.1.1"
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{
"status": "affected",
"version": "7.4.0"
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{
"status": "affected",
"version": "7.0.6.1"
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{
"status": "affected",
"version": "7.2.5.1"
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{
"status": "affected",
"version": "7.4.1"
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{
"status": "affected",
"version": "7.2.6"
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{
"status": "affected",
"version": "7.0.6.2"
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{
"status": "affected",
"version": "7.4.1.1"
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{
"status": "affected",
"version": "7.2.7"
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{
"status": "affected",
"version": "7.2.5.2"
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{
"status": "affected",
"version": "7.3.1.2"
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{
"status": "affected",
"version": "7.2.8"
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{
"status": "affected",
"version": "7.6.0"
},
{
"status": "affected",
"version": "7.4.2"
},
{
"status": "affected",
"version": "7.2.8.1"
},
{
"status": "affected",
"version": "7.0.6.3"
},
{
"status": "affected",
"version": "7.4.2.1"
},
{
"status": "affected",
"version": "7.2.9"
},
{
"status": "affected",
"version": "7.0.7"
},
{
"status": "affected",
"version": "7.7.0"
},
{
"status": "affected",
"version": "7.4.2.2"
},
{
"status": "affected",
"version": "7.2.10"
},
{
"status": "affected",
"version": "7.6.1"
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{
"status": "affected",
"version": "7.4.2.3"
},
{
"status": "affected",
"version": "7.0.8"
},
{
"status": "affected",
"version": "7.6.2"
},
{
"status": "affected",
"version": "7.7.10"
},
{
"status": "affected",
"version": "7.7.11"
},
{
"status": "affected",
"version": "7.0.8.1"
},
{
"status": "affected",
"version": "7.6.2.1"
},
{
"status": "affected",
"version": "7.7.10.1"
},
{
"status": "affected",
"version": "7.4.2.4"
},
{
"status": "affected",
"version": "7.2.10.2"
},
{
"status": "affected",
"version": "7.4.3"
},
{
"status": "affected",
"version": "7.6.4"
},
{
"status": "affected",
"version": "10.0.0"
},
{
"status": "affected",
"version": "7.4.4"
},
{
"status": "affected",
"version": "7.0.9"
},
{
"status": "affected",
"version": "7.2.11"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Cisco",
"product": "Cisco UTD SNORT IPS Engine Software",
"versions": [
{
"status": "affected",
"version": "3.17.1S"
},
{
"status": "affected",
"version": "16.12.3"
},
{
"status": "affected",
"version": "Fuji-16.9.5"
},
{
"status": "affected",
"version": "16.12.4"
},
{
"status": "affected",
"version": "17.3.1a"
},
{
"status": "affected",
"version": "16.6.6"
},
{
"status": "affected",
"version": "16.12.2"
},
{
"status": "affected",
"version": "Fuji-16.9.6"
},
{
"status": "affected",
"version": "3.17.0S"
},
{
"status": "affected",
"version": "Fuji-16.9.3"
},
{
"status": "affected",
"version": "Denali-16.3.7"
},
{
"status": "affected",
"version": "Fuji-16.9.2"
},
{
"status": "affected",
"version": "Fuji-16.9.4"
},
{
"status": "affected",
"version": "Everest-16.6.4"
},
{
"status": "affected",
"version": "Everest-16.6.3"
},
{
"status": "affected",
"version": "16.6.5"
},
{
"status": "affected",
"version": "Denali-16.3.5"
},
{
"status": "affected",
"version": "17.2.1r"
},
{
"status": "affected",
"version": "17.1.1"
},
{
"status": "affected",
"version": "Everest-16.6.2"
},
{
"status": "affected",
"version": "16.6.7a"
},
{
"status": "affected",
"version": "Denali-16.3.4"
},
{
"status": "affected",
"version": "16.6.1"
},
{
"status": "affected",
"version": "Denali-16.3.9"
},
{
"status": "affected",
"version": "Denali-16.3.3"
},
{
"status": "affected",
"version": "16.12.1a"
},
{
"status": "affected",
"version": "17.3.2"
},
{
"status": "affected",
"version": "17.4.1a"
},
{
"status": "affected",
"version": "16.12.5"
},
{
"status": "affected",
"version": "Fuji-16.9.7"
},
{
"status": "affected",
"version": "16.6.9"
},
{
"status": "affected",
"version": "17.3.3"
},
{
"status": "affected",
"version": "17.5.1a"
},
{
"status": "affected",
"version": "17.3.4a"
},
{
"status": "affected",
"version": "17.4.2"
},
{
"status": "affected",
"version": "17.4.1b"
},
{
"status": "affected",
"version": "17.6.1a"
},
{
"status": "affected",
"version": "16.6.10"
},
{
"status": "affected",
"version": "17.7.1a"
},
{
"status": "affected",
"version": "16.12.6"
},
{
"status": "affected",
"version": "Fuji-16.9.8"
},
{
"status": "affected",
"version": "17.6.2"
},
{
"status": "affected",
"version": "17.8.1a"
},
{
"status": "affected",
"version": "16.12.7"
},
{
"status": "affected",
"version": "17.3.5"
},
{
"status": "affected",
"version": "17.6.3a"
},
{
"status": "affected",
"version": "17.7.2"
},
{
"status": "affected",
"version": "17.9.1a"
},
{
"status": "affected",
"version": "17.6.4"
},
{
"status": "affected",
"version": "17.10.1a"
},
{
"status": "affected",
"version": "17.3.6"
},
{
"status": "affected",
"version": "16.12.8"
},
{
"status": "affected",
"version": "17.3.7"
},
{
"status": "affected",
"version": "17.9.2a"
},
{
"status": "affected",
"version": "17.6.5"
},
{
"status": "affected",
"version": "17.11.1a"
},
{
"status": "affected",
"version": "17.9.3a"
},
{
"status": "affected",
"version": "17.12.1a"
},
{
"status": "affected",
"version": "17.9.4"
},
{
"status": "affected",
"version": "17.6.6"
},
{
"status": "affected",
"version": "17.3.8"
},
{
"status": "affected",
"version": "17.12.2"
},
{
"status": "affected",
"version": "17.13.1a"
},
{
"status": "affected",
"version": "17.9.5a"
},
{
"status": "affected",
"version": "17.12.3"
},
{
"status": "affected",
"version": "17.6.7"
},
{
"status": "affected",
"version": "17.14.1a"
},
{
"status": "affected",
"version": "17.12.4"
},
{
"status": "affected",
"version": "17.12.3a"
},
{
"status": "affected",
"version": "17.15.1a"
},
{
"status": "affected",
"version": "17.9.6"
},
{
"status": "affected",
"version": "17.6.8a"
},
{
"status": "affected",
"version": "17.16.1a"
},
{
"status": "affected",
"version": "17.9.5e"
},
{
"status": "affected",
"version": "17.12.4a"
},
{
"status": "affected",
"version": "17.15.2c"
},
{
"status": "affected",
"version": "17.9.5f"
},
{
"status": "affected",
"version": "17.12.4b"
},
{
"status": "affected",
"version": "17.15.2a"
},
{
"status": "affected",
"version": "17.12.5"
},
{
"status": "affected",
"version": "17.17.1"
},
{
"status": "affected",
"version": "17.12.5a"
},
{
"status": "affected",
"version": "17.9.7a"
},
{
"status": "affected",
"version": "17.15.3a"
},
{
"status": "affected",
"version": "17.15.3"
},
{
"status": "affected",
"version": "17.12.5b"
},
{
"status": "affected",
"version": "17.12.5c"
},
{
"status": "affected",
"version": "17.15.4"
},
{
"status": "affected",
"version": "17.9.7b"
},
{
"status": "affected",
"version": "17.18.1"
},
{
"status": "affected",
"version": "17.18.1a"
},
{
"status": "affected",
"version": "17.12.6"
},
{
"status": "affected",
"version": "17.9.8"
},
{
"status": "affected",
"version": "17.15.4c"
},
{
"status": "affected",
"version": "17.12.5d"
},
{
"status": "affected",
"version": "17.18.2"
},
{
"status": "affected",
"version": "26.1.1"
},
{
"status": "affected",
"version": "17.15.5"
},
{
"status": "affected",
"version": "17.15.5a"
},
{
"status": "affected",
"version": "17.12.7"
},
{
"status": "affected",
"version": "17.12.7a"
},
{
"status": "affected",
"version": "17.12.7b"
},
{
"status": "affected",
"version": "17.9.9"
},
{
"status": "affected",
"version": "17.12.8"
},
{
"status": "affected",
"version": "17.15.6"
},
{
"status": "affected",
"version": "17.18.4"
},
{
"status": "affected",
"version": "26.1.2"
}
],
"defaultStatus": "unknown"
}
]- Related CVEs
- CVE-2026-20011
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #52357 · Revision 1
- Added to Heist Feed
- Publisher date