# Cisco Snort 3 vulnerabilities Source: https://junglewise.ai/threats/technologies/snort-3 Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/snort-3.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 20 vulnerabilities in Cisco Snort 3: 0 in the last 7 days and 11 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-76489, was published on 21 October 2026. 11 vulnerabilities in the last four weeks, up from none in the four before. 1 critical against 0. ## Counts - Last 7 days: 0 - Last 30 days: 11 - Last 90 days: 11 - All time: 20 (1 critical, 0 exploited in the wild) ## About Cisco Snort 3 Cisco open-source network intrusion detection and prevention system. ## Latest Cisco Snort 3 vulnerabilities - [CVE-2026-76489: Cisco Snort 3 memory management denial of service](https://junglewise.ai/threats/cve-2026-76489-multiple-cisco-products-are-affected-by-a-vulnerability-in-the) (medium, CVSS 5.8, published 21 Oct 2026) - [CVE-2026-76445: Cisco Snort 3 Detection Engine denial of service in GTP codec](https://junglewise.ai/threats/cve-2026-76445-multiple-cisco-products-are-affected-by-a-vulnerability-in-the) (medium, CVSS 5.3, published 21 Oct 2026) - [CVE-2026-20356: Cisco Snort 3 uncontrolled resource consumption](https://junglewise.ai/threats/cve-2026-20356-as-part-of-cisco-s-ongoing-commitment-to-proactive-security-and) (high, CVSS 7.5, published 21 Oct 2026) - [CVE-2026-20291: Cisco Snort 3 improper privilege management](https://junglewise.ai/threats/cve-2026-20291-as-part-of-cisco-s-ongoing-commitment-to-proactive-security-and) (high, CVSS 7.8, published 21 Oct 2026) - [CVE-2026-20236: Cisco Snort 3 incorrect calculation vulnerability](https://junglewise.ai/threats/cve-2026-20236-as-part-of-cisco-s-ongoing-commitment-to-proactive-security-and) (high, CVSS 7.5, published 21 Oct 2026) - [CVE-2026-20218: Cisco Snort 3 VBA decompression buffer overflow denial of service](https://junglewise.ai/threats/cve-2026-20218-a-vulnerability-in-the-snort-3-visual-basic-for-applications-vba) (medium, CVSS 5.8, published 21 Oct 2026) - [CVE-2026-20197: Cisco Snort 3 Teredo detection engine denial of service](https://junglewise.ai/threats/cve-2026-20197-multiple-cisco-products-are-affected-by-a-vulnerability-in-the) (medium, CVSS 5.8, published 21 Oct 2026) - [CVE-2026-20179: Cisco Snort 3 GRE detection engine denial of service](https://junglewise.ai/threats/cve-2026-20179-multiple-cisco-products-are-affected-by-a-vulnerability-in-the) (medium, CVSS 5.8, published 21 Oct 2026) - [CVE-2026-20043: Cisco Snort 3 out-of-bounds write](https://junglewise.ai/threats/cve-2026-20043-as-part-of-cisco-s-ongoing-commitment-to-proactive-security-and) (critical, CVSS 9, published 21 Oct 2026) - [CVE-2026-20019: Cisco Snort 3 NetFlow Detection Engine denial of service](https://junglewise.ai/threats/cve-2026-20019-multiple-cisco-products-are-affected-by-a-vulnerability-in-the) (medium, CVSS 5.8, published 21 Oct 2026) - [CVE-2026-20011: Cisco multiple products SMTP MIME parsing denial of service in Snort 3](https://junglewise.ai/threats/cve-2026-20011-multiple-cisco-products-are-affected-by-a-vulnerability-in-the) (medium, CVSS 5.8, published 21 Oct 2026) - [CVE-2026-20068: Cisco Snort 3 detection engine denial of service](https://junglewise.ai/threats/cve-2026-20068-cisco-snort-3-detection-engine-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20067: Cisco Snort 3 detection engine denial of service](https://junglewise.ai/threats/cve-2026-20067-cisco-snort-3-detection-engine-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20065: Cisco Snort 3 Detection Engine denial of service](https://junglewise.ai/threats/cve-2026-20065-cisco-snort-3-detection-engine-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20058: Cisco Snort 3 VBA decompression denial of service](https://junglewise.ai/threats/cve-2026-20058-cisco-snort-3-vba-decompression-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20057: Cisco Snort 3 VBA decompression denial of service](https://junglewise.ai/threats/cve-2026-20057-cisco-snort-3-vba-decompression-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20054: Cisco Snort 3 VBA decompression denial of service](https://junglewise.ai/threats/cve-2026-20054-cisco-snort-3-vba-decompression-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20053: Cisco Snort 3 VBA decompression denial of service](https://junglewise.ai/threats/cve-2026-20053-cisco-snort-3-vba-decompression-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20005: Cisco Snort 3 Detection Engine denial of service in SSL handshake parsing](https://junglewise.ai/threats/cve-2026-20005-cisco-snort-3-detection-engine-denial-of-service-in-ssl-handshake) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2025-20359: Cisco Snort 3 buffer under-read in HTTP MIME decoder](https://junglewise.ai/threats/cve-2025-20359-cisco-snort-3-buffer-under-read-in-http-mime-decoder) (medium, CVSS 6.5, published 15 Oct 2025) ## Most severe Cisco Snort 3 vulnerabilities - [CVE-2026-20043: Cisco Snort 3 out-of-bounds write](https://junglewise.ai/threats/cve-2026-20043-as-part-of-cisco-s-ongoing-commitment-to-proactive-security-and) (critical, CVSS 9, published 21 Oct 2026) - [CVE-2026-20291: Cisco Snort 3 improper privilege management](https://junglewise.ai/threats/cve-2026-20291-as-part-of-cisco-s-ongoing-commitment-to-proactive-security-and) (high, CVSS 7.8, published 21 Oct 2026) - [CVE-2026-20356: Cisco Snort 3 uncontrolled resource consumption](https://junglewise.ai/threats/cve-2026-20356-as-part-of-cisco-s-ongoing-commitment-to-proactive-security-and) (high, CVSS 7.5, published 21 Oct 2026) - [CVE-2026-20236: Cisco Snort 3 incorrect calculation vulnerability](https://junglewise.ai/threats/cve-2026-20236-as-part-of-cisco-s-ongoing-commitment-to-proactive-security-and) (high, CVSS 7.5, published 21 Oct 2026) - [CVE-2025-20359: Cisco Snort 3 buffer under-read in HTTP MIME decoder](https://junglewise.ai/threats/cve-2025-20359-cisco-snort-3-buffer-under-read-in-http-mime-decoder) (medium, CVSS 6.5, published 15 Oct 2025) - [CVE-2026-20005: Cisco Snort 3 Detection Engine denial of service in SSL handshake parsing](https://junglewise.ai/threats/cve-2026-20005-cisco-snort-3-detection-engine-denial-of-service-in-ssl-handshake) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20067: Cisco Snort 3 detection engine denial of service](https://junglewise.ai/threats/cve-2026-20067-cisco-snort-3-detection-engine-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20057: Cisco Snort 3 VBA decompression denial of service](https://junglewise.ai/threats/cve-2026-20057-cisco-snort-3-vba-decompression-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20054: Cisco Snort 3 VBA decompression denial of service](https://junglewise.ai/threats/cve-2026-20054-cisco-snort-3-vba-decompression-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) - [CVE-2026-20068: Cisco Snort 3 detection engine denial of service](https://junglewise.ai/threats/cve-2026-20068-cisco-snort-3-detection-engine-denial-of-service) (medium, CVSS 5.8, published 4 Mar 2026) ## Vulnerabilities per week 11 vulnerabilities in the last four weeks, up from none in the four before. 1 critical against 0. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 11 | 1 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other Cisco technologies - [Cisco IOS](https://junglewise.ai/threats/technologies/ios): 70 vulnerabilities - [Cisco Identity Services Engine](https://junglewise.ai/threats/technologies/identity-services-engine): 58 vulnerabilities - [Cisco IOS XE](https://junglewise.ai/threats/technologies/ios-xe): 57 vulnerabilities - [Cisco Firepower Threat Defense](https://junglewise.ai/threats/technologies/firepower-threat-defense): 33 vulnerabilities - [Cisco Firepower Threat Defense Software](https://junglewise.ai/threats/technologies/firepower-threat-defense-software): 33 vulnerabilities - [Cisco IOS XR](https://junglewise.ai/threats/technologies/ios-xr): 31 vulnerabilities - [Cisco IOS XE Software](https://junglewise.ai/threats/technologies/ios-xe-software): 28 vulnerabilities - [Cisco Adaptive Security Appliance Software](https://junglewise.ai/threats/technologies/secure-firewall-asa-software): 23 vulnerabilities - [Cisco Ios Software](https://junglewise.ai/threats/technologies/ios-software): 19 vulnerabilities - [Cisco ISE Passive Identity Connector](https://junglewise.ai/threats/technologies/ise-passive-identity-connector): 19 vulnerabilities - [Cisco Secure Firewall Management Center](https://junglewise.ai/threats/technologies/secure-firewall-management-center): 16 vulnerabilities - [Cisco Unity Connection](https://junglewise.ai/threats/technologies/unity-connection): 16 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Cisco Snort 3 vulnerabilities", https://junglewise.ai/threats/technologies/snort-3, 11 November 2026.