Technology · Cisco
Cisco IOS XE vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 53 vulnerabilities in Cisco IOS XE: 0 in the last 7 days and 6 in the last 90 days, 41 of them critical and 40 exploited in the wild. The most recent, CVE-2026-20273, was published on 5 August 2026.
- Last 7 days
- 0
- Last 90 days
- 6
- Critical, all time
- 41
- Exploited in the wild
- 40
About Cisco IOS XE
An operating system for Cisco networking equipment that integrates Linux with the Cisco IOS software.
Latest Cisco IOS XE vulnerabilities
- CVE-2026-20273: Cisco IOS XE Software improper input validationhighCVSS 8.6EPSS 0.5%
- CVE-2026-20272: Cisco IOS XE Software improper neutralization of special elementscriticalCVSS 9.8EPSS 0.6%
- CVE-2026-20271: Cisco IOS XE insufficient control flow managementhighCVSS 8.6EPSS 0.5%
- CVE-2026-20270: Cisco IOS XE Software incorrect calculation vulnerabilityhighCVSS 8.6EPSS 0.5%
- CVE-2026-20269: Cisco IOS XE improper resource lifetime controlhighCVSS 8.6EPSS 0.5%
- CVE-2026-20268: Cisco IOS XE Software buffer overflow in memory operationshighCVSS 8.6EPSS 0.5%
- CVE-2026-20066: Cisco Snort 3 Detection Engine denial of service in HTTP JavaScript normalizationmediumCVSS 5.8EPSS 0.4%
- CVE-2026-20065: Cisco Snort 3 Detection Engine denial of servicemediumCVSS 5.8EPSS 0.4%
- CVE-2026-20058: Cisco Snort 3 VBA decompression denial of servicemediumCVSS 5.8EPSS 0.4%
- CVE-2026-20057: Cisco Snort 3 VBA decompression denial of servicemediumCVSS 5.8EPSS 0.4%
- CVE-2026-20054: Cisco Snort 3 VBA decompression denial of servicemediumCVSS 5.8EPSS 0.4%
- CVE-2026-20053: Cisco Snort 3 VBA decompression denial of servicemediumCVSS 5.8EPSS 0.4%
- CVE-2025-20359: Cisco Snort 3 buffer under-read in HTTP MIME decodermediumCVSS 6.5EPSS 0.5%
- CVE-2025-20352: Cisco IOS and IOS XE stack overflow in SNMP subsystemcriticalexploited in the wildCVSS 7.7EPSS 3.6%
- CVE-2023-20273: Cisco IOS XE Web UI Command Injection Vulnerabilitycriticalexploited in the wildCVSS 7.2
- CVE-2023-20198: Cisco IOS XE Web UI Privilege Escalation Vulnerabilitycriticalexploited in the wildCVSS 10
- CVE-2023-20109: Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerabilitycriticalexploited in the wildCVSS 6.6
- CVE-2004-1464: Cisco IOS Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 5.9
- CVE-2016-6415: Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerabilitycriticalexploited in the wildCVSS 7.5
- CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-3881: Cisco IOS and IOS XE Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2018-0159: Cisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 7.5
- CVE-2017-6743: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6738: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2018-0180: Cisco IOS Software Denial-of-Service Vulnerabilitycriticalexploited in the wildCVSS 5.9
Most severe Cisco IOS XE vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2023-20198: Cisco IOS XE Web UI Privilege Escalation Vulnerabilitycriticalexploited in the wildCVSS 10
- CVE-2017-3881: Cisco IOS and IOS XE Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2017-12240: Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2018-0151: Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2018-0171: Cisco IOS and IOS XE Software Smart Install Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2017-6742: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6738: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6744: Cisco IOS Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6743: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
- CVE-2017-6740: Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerabilitycriticalexploited in the wildCVSS 8.8
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 6 | 1 | |
| 10 Aug 2026 | 0 | 0 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/ios-xe.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Cisco IOS XE vulnerabilities", https://junglewise.ai/threats/technologies/ios-xe, 26 September 2026.