# Cisco IOS XE vulnerabilities Source: https://junglewise.ai/threats/technologies/ios-xe 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.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 57 vulnerabilities in Cisco IOS XE: 0 in the last 7 days and 3 in the last 90 days, 43 of them critical and 41 exploited in the wild. The most recent, CVE-2026-76445, was published on 21 October 2026. 3 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: 3 - Last 90 days: 3 - All time: 57 (43 critical, 41 exploited in the wild) ## About Cisco IOS XE IOS XE is a Cisco operating system used on various network devices. ## Latest Cisco IOS XE vulnerabilities - [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-2026-20236: 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-2026-20043: 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-2026-20273: Cisco IOS XE Software improper input validation](https://junglewise.ai/threats/cve-2026-20273-cisco-ios-xe-software-improper-input-validation) (high, CVSS 8.6, published 5 Aug 2026) - [CVE-2026-20272: Cisco IOS XE Software improper neutralization of special elements](https://junglewise.ai/threats/cve-2026-20272-cisco-ios-xe-software-improper-neutralization-of-special-elements) (critical, CVSS 9.8, published 5 Aug 2026) - [CVE-2026-20271: Cisco IOS XE insufficient control flow management](https://junglewise.ai/threats/cve-2026-20271-cisco-ios-xe-insufficient-control-flow-management) (high, CVSS 8.6, published 5 Aug 2026) - [CVE-2026-20270: Cisco IOS XE Software incorrect calculation vulnerability](https://junglewise.ai/threats/cve-2026-20270-cisco-ios-xe-software-incorrect-calculation-vulnerability) (high, CVSS 8.6, published 5 Aug 2026) - [CVE-2026-20269: Cisco IOS XE improper resource lifetime control](https://junglewise.ai/threats/cve-2026-20269-cisco-ios-xe-improper-resource-lifetime-control) (high, CVSS 8.6, published 5 Aug 2026) - [CVE-2026-20268: Cisco IOS XE Software buffer overflow in memory operations](https://junglewise.ai/threats/cve-2026-20268-cisco-ios-xe-software-buffer-overflow-in-memory-operations) (high, CVSS 8.6, published 5 Aug 2026) - [CVE-2026-20066: Cisco Snort 3 Detection Engine denial of service in HTTP JavaScript normalization](https://junglewise.ai/threats/cve-2026-20066-cisco-snort-3-detection-engine-denial-of-service-in-http) (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-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-2025-20352: Cisco IOS and IOS XE stack overflow in SNMP subsystem](https://junglewise.ai/threats/cve-2025-20352-cisco-ios-and-ios-xe-stack-overflow-in-snmp-subsystem) (critical, exploited in the wild, CVSS 7.7, published 29 Sep 2025) - [CVE-2020-3259: SafePay ransomware campaign](https://junglewise.ai/threats/cve-2020-3259-cisco-asa-and-ftd-information-disclosure-vulnerability) (critical, exploited in the wild, CVSS 7.5, published 15 Feb 2024) - [CVE-2023-20273: Cisco IOS XE Web UI Command Injection Vulnerability](https://junglewise.ai/threats/cve-2023-20273-cisco-ios-xe-web-ui-command-injection-vulnerability) (critical, exploited in the wild, CVSS 7.2, published 23 Oct 2023) - [CVE-2023-20198: Cisco IOS XE Web UI Privilege Escalation Vulnerability](https://junglewise.ai/threats/cve-2023-20198-cisco-ios-xe-web-ui-privilege-escalation-vulnerability) (critical, exploited in the wild, CVSS 10, published 16 Oct 2023) - [CVE-2023-20109: Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability](https://junglewise.ai/threats/cve-2023-20109-cisco-ios-and-ios-xe-group-encrypted-transport-vpn-out-of-bounds) (critical, exploited in the wild, CVSS 6.6, published 10 Oct 2023) - [CVE-2016-6415: Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerability](https://junglewise.ai/threats/cve-2016-6415-cisco-ios-ios-xr-and-ios-xe-ikev1-information-disclosure) (critical, exploited in the wild, CVSS 7.5, published 19 May 2023) - [CVE-2004-1464: Cisco IOS Denial-of-Service Vulnerability](https://junglewise.ai/threats/cve-2004-1464-cisco-ios-denial-of-service-vulnerability) (critical, exploited in the wild, CVSS 5.9, published 19 May 2023) - [CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6742-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 19 Apr 2023) - [CVE-2017-3881: Cisco IOS and IOS XE Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-3881-cisco-ios-and-ios-xe-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 25 Mar 2022) ## Most severe Cisco IOS XE vulnerabilities - [CVE-2023-20198: Cisco IOS XE Web UI Privilege Escalation Vulnerability](https://junglewise.ai/threats/cve-2023-20198-cisco-ios-xe-web-ui-privilege-escalation-vulnerability) (critical, exploited in the wild, CVSS 10, published 16 Oct 2023) - [CVE-2017-3881: Cisco IOS and IOS XE Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-3881-cisco-ios-and-ios-xe-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 25 Mar 2022) - [CVE-2018-0151: Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2018-0151-cisco-ios-software-and-cisco-ios-xe-software-quality-of-service) (critical, exploited in the wild, CVSS 9.8, published 3 Mar 2022) - [CVE-2017-12240: Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-12240-cisco-ios-and-ios-xe-software-dhcp-remote-code-execution) (critical, exploited in the wild, CVSS 9.8, published 3 Mar 2022) - [CVE-2018-0171: Cisco IOS and IOS XE Software Smart Install Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2018-0171-cisco-ios-and-ios-xe-software-smart-install-remote-code-execution) (critical, exploited in the wild, CVSS 9.8, published 3 Nov 2021) - [CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6742-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 19 Apr 2023) - [CVE-2017-6744: Cisco IOS Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6744-cisco-ios-software-snmp-remote-code-execution-vulnerability) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6739: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6739-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6743: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6743-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) - [CVE-2017-6738: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability](https://junglewise.ai/threats/cve-2017-6738-cisco-ios-and-ios-xe-software-snmp-remote-code-execution) (critical, exploited in the wild, CVSS 8.8, published 3 Mar 2022) ## Vulnerabilities per week 3 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 | 3 | 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 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 - [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 IOS XE vulnerabilities", https://junglewise.ai/threats/technologies/ios-xe, 11 November 2026.