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CVE PROGRAM SOURCE RECORD5.8 Medium

CVE-2026-20011

Multiple Cisco Products Snort 3 SMTP MIME Denial of Service Vulnerability

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Cisco Cisco Open Source Snort3

Default version status: unknown

  • 3.1.2.0affected
  • 3.1.3.0affected
  • 3.1.4.0affected
  • 3.1.5.0affected
  • 3.1.6.0affected
  • 3.1.7.0affected
  • 3.1.8.0affected
  • 3.1.9.0affected
  • 3.1.10.0affected
  • 3.1.12.0affected
  • 3.1.13.0affected
  • 3.1.14.0affected
  • 3.1.15.0affected
  • 3.1.16.0affected
  • 3.1.17.0affected
  • 3.1.18.0affected
  • 3.1.19.0affected
  • 3.1.20.0affected
  • 3.1.21.0affected
  • 3.1.22.0affected
  • 3.1.23.0affected
  • 3.1.24.0affected
  • 3.1.25.0affected
  • 3.1.27.0affected
  • 3.1.28.0affected
  • 3.1.29.0affected
  • 3.1.30.0affected
  • 3.1.31.0affected
  • 3.1.32.0affected
  • 3.1.36.0affected
  • 3.1.38.0affected
  • 3.1.39.0affected
  • 3.1.40.0affected
  • 3.1.41.0affected
  • 3.1.42.0affected
  • 3.1.43.0affected
  • 3.1.45.0affected
  • 3.1.47.0affected
  • 3.1.48.0affected
  • 3.1.50.0affected
  • 3.1.51.0affected
  • 3.1.52.0affected
  • 3.1.53.0affected
  • 3.1.55.0affected
  • 3.1.56.0affected
  • 3.1.57.0affected
  • 3.1.58.0affected
  • 3.1.59.0affected
  • 3.1.60.0affected
  • 3.1.61.0affected
  • 3.1.62.0affected
  • 3.1.63.0affected
  • 3.1.64.0affected
  • 3.1.65.0affected
  • 3.1.66.0affected
  • 3.1.67.0affected
  • 3.1.69.0affected
  • 3.1.70.0affected
  • 3.1.71.0affected
  • 3.1.72.0affected
  • 3.1.73.0affected
  • 3.1.74.0affected
  • 3.1.75.0affected
  • 3.1.76.0affected
  • 3.1.77.0affected
  • 3.1.78.0affected
  • 3.1.81.0affected
  • 3.1.82.0affected
  • 3.1.83.0affected
  • 3.1.84.0affected
  • 3.2.1.0affected
  • 3.2.2.0affected
  • 3.3.0.0affected
  • 3.3.1.0affected
  • 3.3.2.0affected
  • 3.3.3.0affected
  • 3.3.4.0affected
  • 3.3.5.0affected
  • 3.3.7.0affected
  • 3.5.0.0affected
  • 3.5.1.0affected
  • 3.8.1.0affected
  • 3.6.0.0affected
  • 3.6.2.0affected
  • 3.9.3.0affected
  • 3.7.2.0affected
  • 3.7.0.0affected
  • 3.9.6.0affected
  • 3.10.0.0affected
  • 3.7.4.0affected
  • 3.9.0.0affected
  • 3.5.2.0affected
  • 3.6.1.0affected
  • 3.9.2.0affected
  • 3.6.3.0affected
  • 3.9.5.0affected
  • 3.7.1.0affected
  • 3.9.7.0affected
  • 3.7.3.0affected
  • 3.9.1.0affected

Cisco Cisco Secure Firewall Threat Defense (FTD) Software

Default version status: unknown

  • 7.0.0affected
  • 7.0.0.1affected
  • 7.0.1affected
  • 7.0.1.1affected
  • 7.0.2affected
  • 7.2.0affected
  • 7.0.2.1affected
  • 7.0.3affected
  • 7.2.0.1affected
  • 7.0.4affected
  • 7.2.1affected
  • 7.0.5affected
  • 7.3.0affected
  • 7.2.2affected
  • 7.2.3affected
  • 7.3.1affected
  • 7.2.4affected
  • 7.0.6affected
  • 7.2.5affected
  • 7.2.4.1affected
  • 7.3.1.1affected
  • 7.4.0affected
  • 7.0.6.1affected
  • 7.2.5.1affected
  • 7.4.1affected
  • 7.2.6affected
  • 7.0.6.2affected
  • 7.4.1.1affected
  • 7.2.7affected
  • 7.2.5.2affected
  • 7.3.1.2affected
  • 7.2.8affected
  • 7.6.0affected
  • 7.4.2affected
  • 7.2.8.1affected
  • 7.0.6.3affected
  • 7.4.2.1affected
  • 7.2.9affected
  • 7.0.7affected
  • 7.7.0affected
  • 7.4.2.2affected
  • 7.2.10affected
  • 7.6.1affected
  • 7.4.2.3affected
  • 7.0.8affected
  • 7.6.2affected
  • 7.7.10affected
  • 7.7.11affected
  • 7.0.8.1affected
  • 7.6.2.1affected
  • 7.7.10.1affected
  • 7.4.2.4affected
  • 7.2.10.2affected
  • 7.4.3affected
  • 7.6.4affected
  • 10.0.0affected
  • 7.4.4affected
  • 7.0.9affected
  • 7.2.11affected

Cisco Cisco UTD SNORT IPS Engine Software

Default version status: unknown

  • 3.17.1Saffected
  • 16.12.3affected
  • Fuji-16.9.5affected
  • 16.12.4affected
  • 17.3.1aaffected
  • 16.6.6affected
  • 16.12.2affected
  • Fuji-16.9.6affected
  • 3.17.0Saffected
  • Fuji-16.9.3affected
  • Denali-16.3.7affected
  • Fuji-16.9.2affected
  • Fuji-16.9.4affected
  • Everest-16.6.4affected
  • Everest-16.6.3affected
  • 16.6.5affected
  • Denali-16.3.5affected
  • 17.2.1raffected
  • 17.1.1affected
  • Everest-16.6.2affected
  • 16.6.7aaffected
  • Denali-16.3.4affected
  • 16.6.1affected
  • Denali-16.3.9affected
  • Denali-16.3.3affected
  • 16.12.1aaffected
  • 17.3.2affected
  • 17.4.1aaffected
  • 16.12.5affected
  • Fuji-16.9.7affected
  • 16.6.9affected
  • 17.3.3affected
  • 17.5.1aaffected
  • 17.3.4aaffected
  • 17.4.2affected
  • 17.4.1baffected
  • 17.6.1aaffected
  • 16.6.10affected
  • 17.7.1aaffected
  • 16.12.6affected
  • Fuji-16.9.8affected
  • 17.6.2affected
  • 17.8.1aaffected
  • 16.12.7affected
  • 17.3.5affected
  • 17.6.3aaffected
  • 17.7.2affected
  • 17.9.1aaffected
  • 17.6.4affected
  • 17.10.1aaffected
  • 17.3.6affected
  • 16.12.8affected
  • 17.3.7affected
  • 17.9.2aaffected
  • 17.6.5affected
  • 17.11.1aaffected
  • 17.9.3aaffected
  • 17.12.1aaffected
  • 17.9.4affected
  • 17.6.6affected
  • 17.3.8affected
  • 17.12.2affected
  • 17.13.1aaffected
  • 17.9.5aaffected
  • 17.12.3affected
  • 17.6.7affected
  • 17.14.1aaffected
  • 17.12.4affected
  • 17.12.3aaffected
  • 17.15.1aaffected
  • 17.9.6affected
  • 17.6.8aaffected
  • 17.16.1aaffected
  • 17.9.5eaffected
  • 17.12.4aaffected
  • 17.15.2caffected
  • 17.9.5faffected
  • 17.12.4baffected
  • 17.15.2aaffected
  • 17.12.5affected
  • 17.17.1affected
  • 17.12.5aaffected
  • 17.9.7aaffected
  • 17.15.3aaffected
  • 17.15.3affected
  • 17.12.5baffected
  • 17.12.5caffected
  • 17.15.4affected
  • 17.9.7baffected
  • 17.18.1affected
  • 17.18.1aaffected
  • 17.12.6affected
  • 17.9.8affected
  • 17.15.4caffected
  • 17.12.5daffected
  • 17.18.2affected
  • 26.1.1affected
  • 17.15.5affected
  • 17.15.5aaffected
  • 17.12.7affected
  • 17.12.7aaffected
  • 17.12.7baffected
  • 17.9.9affected
  • 17.12.8affected
  • 17.15.6affected
  • 17.18.4affected
  • 26.1.2affected

References