# Cisco IOS XE Unified Threat Defense vulnerabilities Source: https://junglewise.ai/threats/technologies/ios-xe-unified-threat-defense Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/ios-xe-unified-threat-defense.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 7 vulnerabilities in Cisco IOS XE Unified Threat Defense: 0 in the last 7 days and 7 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-76489, was published on 21 October 2026. 7 vulnerabilities in the last four weeks, up from none in the four before. ## Counts - Last 7 days: 0 - Last 30 days: 7 - Last 90 days: 7 - All time: 7 (0 critical, 0 exploited in the wild) ## About Cisco IOS XE Unified Threat Defense Cisco IOS XE feature set providing threat detection and intrusion prevention on routers. ## Latest Cisco IOS XE Unified Threat Defense 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-2026-20291: 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-2026-20221: Cisco multiple products Snort 3 GRE tunnel denial of service](https://junglewise.ai/threats/cve-2026-20221-multiple-cisco-products-are-affected-by-a-vulnerability-in-the) (medium, CVSS 5.8, 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-2026-20019: 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) ## Most severe Cisco IOS XE Unified Threat Defense vulnerabilities - [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-2026-76489: 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-2026-20221: Cisco multiple products Snort 3 GRE tunnel denial of service](https://junglewise.ai/threats/cve-2026-20221-multiple-cisco-products-are-affected-by-a-vulnerability-in-the) (medium, CVSS 5.8, 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-2026-20019: 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) ## Vulnerabilities per week 7 vulnerabilities in the last four weeks, up from none in the four before. | 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 | 7 | 0 | 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 Snort 3](https://junglewise.ai/threats/technologies/snort-3): 20 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 ## 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 IOS XE Unified Threat Defense vulnerabilities", https://junglewise.ai/threats/technologies/ios-xe-unified-threat-defense, 11 November 2026.