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CVE-2026-20011

Multiple Cisco Products Snort 3 SMTP MIME Denial of Service Vulnerability PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Cisco / Cisco Open Source Snort3affected 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 3.7.4.0; affected 3.9.0.0; affected 3.5.2.0; 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 3.9.1.0
Cisco / Cisco Secure Firewall Threat Defense (FTD) Softwareaffected 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 7.2.10; 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 7.2.10.2; affected 7.4.3; affected 7.6.4; affected 10.0.0; affected 7.4.4; affected 7.0.9; affected 7.2.11
Cisco / Cisco UTD SNORT IPS Engine Softwareaffected 3.17.1S; affected 16.12.3; affected Fuji-16.9.5; affected 16.12.4; affected 17.3.1a; affected 16.6.6; affected 16.12.2; affected Fuji-16.9.6; affected 3.17.0S; affected Fuji-16.9.3; affected Denali-16.3.7; affected Fuji-16.9.2; affected Fuji-16.9.4; affected Everest-16.6.4; affected Everest-16.6.3; affected 16.6.5; affected Denali-16.3.5; affected 17.2.1r; affected 17.1.1; affected Everest-16.6.2; affected 16.6.7a; affected Denali-16.3.4; affected 16.6.1; affected Denali-16.3.9; affected Denali-16.3.3; affected 16.12.1a; affected 17.3.2; affected 17.4.1a; affected 16.12.5; affected Fuji-16.9.7; affected 16.6.9; affected 17.3.3; affected 17.5.1a; affected 17.3.4a; affected 17.4.2; affected 17.4.1b; affected 17.6.1a; affected 16.6.10; affected 17.7.1a; affected 16.12.6; affected Fuji-16.9.8; affected 17.6.2; affected 17.8.1a; affected 16.12.7; affected 17.3.5; affected 17.6.3a; affected 17.7.2; affected 17.9.1a; affected 17.6.4; affected 17.10.1a; affected 17.3.6; affected 16.12.8; affected 17.3.7; affected 17.9.2a; affected 17.6.5; affected 17.11.1a; affected 17.9.3a; affected 17.12.1a; affected 17.9.4; affected 17.6.6; affected 17.3.8; affected 17.12.2; affected 17.13.1a; affected 17.9.5a; affected 17.12.3; affected 17.6.7; affected 17.14.1a; affected 17.12.4; affected 17.12.3a; affected 17.15.1a; affected 17.9.6; affected 17.6.8a; affected 17.16.1a; affected 17.9.5e; affected 17.12.4a; affected 17.15.2c; affected 17.9.5f; affected 17.12.4b; affected 17.15.2a; affected 17.12.5; affected 17.17.1; affected 17.12.5a; affected 17.9.7a; affected 17.15.3a; affected 17.15.3; affected 17.12.5b; affected 17.12.5c; affected 17.15.4; affected 17.9.7b; affected 17.18.1; affected 17.18.1a; affected 17.12.6; affected 17.9.8; affected 17.15.4c; affected 17.12.5d; affected 17.18.2; affected 26.1.1; affected 17.15.5; affected 17.15.5a; affected 17.12.7; affected 17.12.7a; affected 17.12.7b; affected 17.9.9; affected 17.12.8; affected 17.15.6; affected 17.18.4; affected 26.1.2

CWE

CWE-805

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.