CVE-2026-20011Medium· 5.8▾ SunlitMultiple 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 err…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 31.9 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
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.
open_source_snort3 3.1.2.0open_source_snort3 3.1.3.0open_source_snort3 3.1.4.0open_source_snort3 3.1.5.0open_source_snort3 3.1.6.0open_source_snort3 3.1.7.0open_source_snort3 3.1.8.0open_source_snort3 3.1.9.0open_source_snort3 3.1.10.0open_source_snort3 3.1.12.0open_source_snort3 3.1.13.0open_source_snort3 3.1.14.0open_source_snort3 3.1.15.0open_source_snort3 3.1.16.0open_source_snort3 3.1.17.0open_source_snort3 3.1.18.0open_source_snort3 3.1.19.0open_source_snort3 3.1.20.0open_source_snort3 3.1.21.0open_source_snort3 3.1.22.0open_source_snort3 3.1.23.0open_source_snort3 3.1.24.0open_source_snort3 3.1.25.0open_source_snort3 3.1.27.0open_source_snort3 3.1.28.0open_source_snort3 3.1.29.0open_source_snort3 3.1.30.0open_source_snort3 3.1.31.0open_source_snort3 3.1.32.0open_source_snort3 3.1.36.0open_source_snort3 3.1.38.0open_source_snort3 3.1.39.0open_source_snort3 3.1.40.0open_source_snort3 3.1.41.0open_source_snort3 3.1.42.0open_source_snort3 3.1.43.0open_source_snort3 3.1.45.0open_source_snort3 3.1.47.0open_source_snort3 3.1.48.0open_source_snort3 3.1.50.0open_source_snort3 3.1.51.0open_source_snort3 3.1.52.0open_source_snort3 3.1.53.0open_source_snort3 3.1.55.0open_source_snort3 3.1.56.0open_source_snort3 3.1.57.0open_source_snort3 3.1.58.0open_source_snort3 3.1.59.0open_source_snort3 3.1.60.0open_source_snort3 3.1.61.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-20179Medium· 5.8Multiple Cisco Products Snort 3 Generic Routing Encapsulation Denial of Service Vulnerabilities
CVE-2026-20019Medium· 5.8Multiple Cisco Products Snort 3 Netflow Denial of Service Vulnerabilities
CVE-2026-20197Medium· 5.8Multiple Cisco Products Snort 3 Teredo Protocol Denial of Service Vulnerability
CVE-2026-20218Medium· 5.8Cisco Secure Firewall Threat Defense Snort 3 Visual Basic for Applications Buffer Overflow Denial of Service Vulnerability
CVE-2026-76445Medium· 5.3Multiple Cisco Products Snort 3 Denial of Service Vulnerability
CVE-2026-76489Medium· 5.8Multiple Cisco Products Snort 3 Generic File Processing Memory Exhaustion Denial of Service Vulnerability