# IOS XE vulnerabilities

> IOS XE is made by Cisco. We track 506 published vulnerabilities listed under that exact name, across 1,101 versions. 29 of them are on the list of flaws known to be exploited, the newest added on 29 September 2025. Cisco lists newer releases under their own names, such as Ios XE SD-WAN, so check those pages too.

Canonical page: https://www.precursorintelligence.com/product/cisco/ios_xe

## At a glance

- **Made by:** [Cisco](https://www.precursorintelligence.com/vendors/cisco)
- **Published vulnerabilities:** 506
- **Known to be exploited:** 29 (listed under the name IOS XE)
- **Versions tracked:** 1,101
- **Most recently added to the known-exploited list:** [CVE-2025-20352](https://www.precursorintelligence.com/what-is/cve-2025-20352), 29 September 2025. We keep watching the list.

## Is IOS XE listed under other names?

Cisco also lists IOS XE under more specific names, such as Ios XE SD-WAN and Ios XE 3.4sg. Flaws listed only under those names are counted on their own pages, not here.

- [Ios XE SD-WAN](https://www.precursorintelligence.com/product/cisco/ios_xe_sd-wan): 26 published vulnerabilities
- [Ios XE 3.4sg](https://www.precursorintelligence.com/product/cisco/ios_xe_3.4sg): 3 published vulnerabilities
- [Ios XE 3.3xo](https://www.precursorintelligence.com/product/cisco/ios_xe_3.3xo): 3 published vulnerabilities
- [Ios XE Rom Monitor](https://www.precursorintelligence.com/product/cisco/ios_xe_rom_monitor): 3 published vulnerabilities
- [Ios XE 3.3sg](https://www.precursorintelligence.com/product/cisco/ios_xe_3.3sg): 3 published vulnerabilities
- [Ios XE 3.2ja](https://www.precursorintelligence.com/product/cisco/ios_xe_3.2ja): 2 published vulnerabilities
- [Ios XE 16.1](https://www.precursorintelligence.com/product/cisco/ios_xe_16.1): 2 published vulnerabilities
- [Ios XE SD-WAN 16.10.2 When Installed on 1000 Series Integrated Services](https://www.precursorintelligence.com/product/cisco/ios_xe_sd-wan_16.10.2_when_installed_on_1000_series_integrated_services): 1 published vulnerability
- [Ios XE SD-WAN 16.10.1 When Installed on Integrated Services Virtual](https://www.precursorintelligence.com/product/cisco/ios_xe_sd-wan_16.10.1_when_installed_on_integrated_services_virtual): 1 published vulnerability
- [Ios XE SD-WAN 16.10.1 When Installed on ASR 1000 Series Aggregation Services](https://www.precursorintelligence.com/product/cisco/ios_xe_sd-wan_16.10.1_when_installed_on_asr_1000_series_aggregation_services): 1 published vulnerability
- [Ios XE SD-WAN 16.10.1 When Installed on 4000 Series Integrated Services](https://www.precursorintelligence.com/product/cisco/ios_xe_sd-wan_16.10.1_when_installed_on_4000_series_integrated_services): 1 published vulnerability
- [Ios XE SD-WAN 16.10.1 When Installed on 1000 Series Integrated Services](https://www.precursorintelligence.com/product/cisco/ios_xe_sd-wan_16.10.1_when_installed_on_1000_series_integrated_services): 1 published vulnerability

## Which versions of IOS XE do the exploited flaws hit?

Each exploited flaw lists the versions it affects, as published. "16.12 to before 16.12.10a" means from 16.12 up to, but not including, 16.12.10a.

- [CVE-2025-20352](https://www.precursorintelligence.com/what-is/cve-2025-20352) (Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability): 3.5.0e, 3.5.0sq, 3.5.1e, 3.5.1sq, 3.5.2e, 3.5.2sq, 3.5.3e, 3.5.3sq, 3.5.4sq, 3.5.5sq, 3.5.6sq, 3.5.7sq, 3.5.8sq, 3.6.0e, 3.6.1e, 3.6.2ae, 3.6.2e, 3.6.3e, 3.6.4e, 3.6.5ae, 3.6.5e, 3.6.6e, 3.6.7be, 3.6.7e, 3.6.8e, 3.6.9e, 3.6.10e, 3.7.0e, 3.7.1e, 3.7.2e, 3.7.3e, 3.7.4e, 3.7.5e, 3.8.0e, 3.8.1e, 3.8.2e, 3.8.3e, 3.8.4e, 3.8.5ae, 3.8.5e, 3.8.6e, 3.8.7e, 3.8.8e, 3.8.9e, 3.8.10e, 3.9.0e, 3.9.1e, 3.9.2e, 3.10.0ce, 3.10.0e, 3.10.1e, 3.10.2e, 3.10.3e, 3.11.0e, 3.11.1ae, 3.11.1e, 3.11.2e, 3.11.3ae, 3.11.3e, 3.11.4e, 3.11.5e, 3.11.6e, 3.11.7e, 3.11.8e, 3.11.9e, 3.11.10e, 3.11.11e, 3.11.12e, 3.14.0s, 3.14.1s, 3.14.2s, 3.14.3s, 3.14.4s, 3.15.0s, 3.15.1cs, 3.15.1s, 3.15.2s, 3.15.3s, 3.15.4s, 3.16.0cs, 3.16.0s, 3.16.1as, 3.16.1s, 3.16.2as, 3.16.2bs, 3.16.2s, 3.16.3as, 3.16.3s, 3.16.4as, 3.16.4bs, 3.16.4ds, 3.16.4s, 3.16.5s, 3.16.6bs, 3.16.6s, 3.16.7as, 3.16.7bs, 3.16.7s, 3.16.8s, 3.16.9s, 3.16.10s, 3.17.0s, 3.17.1as, 3.17.1s, 3.17.2s, 3.17.3s, 3.17.4s, 3.18.0as, 3.18.0s, 3.18.0sp, 3.18.1asp, 3.18.1bsp, 3.18.1csp, 3.18.1s, 3.18.1sp, 3.18.2asp, 3.18.2s, 3.18.2sp, 3.18.3asp, 3.18.3bsp, 3.18.3s, 3.18.3sp, 3.18.4s, 3.18.4sp, 3.18.5sp, 3.18.6sp, 3.18.7sp, 3.18.8asp, 3.18.9sp, 16.6.1, 16.6.2, 16.6.3, 16.6.4a, 16.6.4, 16.6.5a, 16.6.5, 16.6.6, 16.6.7, 16.6.8, 16.6.9, 16.6.10, 16.7.1a, 16.7.1b, 16.7.1, 16.7.2, 16.7.3, 16.7.4, 16.8.1a, 16.8.1b, 16.8.1, 16.8.1c, 16.8.1d, 16.8.1e, 16.8.1s, 16.8.2, 16.8.3, 16.9.1a, 16.9.1b, 16.9.1, 16.9.1s, 16.9.2, 16.9.3a, 16.9.3, 16.9.4, 16.9.5, 16.9.5f, 16.9.6, 16.9.7, 16.9.8, 16.10.1a, 16.10.1b, 16.10.1, 16.10.1c, 16.10.1d, 16.10.1e, 16.10.1f, 16.10.1g, 16.10.1s, 16.10.2, 16.10.3, 16.11.1a, 16.11.1b, 16.11.1, 16.11.1s, 16.11.2, 16.12.1a, 16.12.1, 16.12.1c, 16.12.1s, 16.12.1t, 16.12.1w, 16.12.1x, 16.12.1y, 16.12.1z1, 16.12.1z2, 16.12.2a, 16.12.2, 16.12.2s, 16.12.3a, 16.12.3, 16.12.3s, 16.12.4a, 16.12.4, 16.12.5a, 16.12.5b, 16.12.5, 16.12.6a, 16.12.6, 16.12.7, 16.12.8, 16.12.9, 16.12.10a, 16.12.10, 16.12.11, 16.12.12, 16.12.13, 17.1.1a, 17.1.1, 17.1.1s, 17.1.1t, 17.1.3, 17.2.1a, 17.2.1, 17.2.1r, 17.2.1v, 17.2.2, 17.2.3, 17.3.1a, 17.3.1, 17.3.1w, 17.3.1x, 17.3.1z, 17.3.2a, 17.3.2, 17.3.3, 17.3.4a, 17.3.4b, 17.3.4, 17.3.4c, 17.3.5a, 17.3.5b, 17.3.5, 17.3.6, 17.3.7, 17.3.8a, 17.3.8, 17.4.1a, 17.4.1b, 17.4.1, 17.4.2a, 17.4.2, 17.5.1a, 17.5.1, 17.6.1a, 17.6.1, 17.6.1w, 17.6.1x, 17.6.1y, 17.6.1z, 17.6.1z1, 17.6.2, 17.6.3a, 17.6.3, 17.6.4, 17.6.5a, 17.6.5, 17.6.6a, 17.6.6, 17.6.7, 17.6.8a, 17.6.8, 17.7.1a, 17.7.1b, 17.7.1, 17.7.2, 17.8.1a, 17.8.1, 17.9.1a, 17.9.1, 17.9.1w, 17.9.1x, 17.9.1x1, 17.9.1y, 17.9.1y1, 17.9.2a, 17.9.2, 17.9.3a, 17.9.3, 17.9.4a, 17.9.4, 17.9.5a, 17.9.5b, 17.9.5, 17.9.5e, 17.9.5f, 17.9.6a, 17.9.6, 17.9.7a, 17.9.7b, 17.9.7, 17.10.1a, 17.10.1b, 17.10.1, 17.11.1a, 17.11.1, 17.12.1a, 17.12.1, 17.12.1w, 17.12.1x, 17.12.1y, 17.12.1z, 17.12.1z1, 17.12.1z2, 17.12.1z3, 17.12.1z4, 17.12.2a, 17.12.2, 17.12.3a, 17.12.3, 17.12.4a, 17.12.4b, 17.12.4, 17.12.5a, 17.12.5b, 17.12.5, 17.12.5c, 17.13.1a, 17.13.1, 17.14.1a, 17.14.1, 17.15.1a, 17.15.1b, 17.15.1, 17.15.1w, 17.15.1x, 17.15.1y, 17.15.1z, 17.15.2a, 17.15.2b, 17.15.2, 17.15.2c, 17.15.3a, 17.15.3b, 17.15.3, 17.15.4, 17.16.1a, 17.16.1, 17.17.1, 17.18.1
- [CVE-2023-20273](https://www.precursorintelligence.com/what-is/cve-2023-20273) (Cisco IOS XE Web UI Command Injection Vulnerability): 16.1.1, 16.1.2, 16.1.3, 16.2.1, 16.2.2, 16.3.1a, 16.3.2, 16.3.3, 16.3.4, 16.3.5b, 16.3.5, 16.3.6, 16.3.7, 16.3.8, 16.3.9, 16.3.10, 16.3.11, 16.4.1, 16.4.2, 16.4.3, 16.5.1a, 16.5.1b, 16.5.1, 16.5.2, 16.5.3, 16.6.1, 16.6.2, 16.6.3, 16.6.4a, 16.6.4, 16.6.5a, 16.6.5, 16.6.6, 16.6.7, 16.6.8, 16.6.9, 16.6.10, 16.7.1a, 16.7.1b, 16.7.1, 16.7.2, 16.7.3, 16.7.4, 16.8.1a, 16.8.1b, 16.8.1, 16.8.1c, 16.8.1d, 16.8.1e, 16.8.1s, 16.8.2, 16.8.3, 16.9.1a, 16.9.1b, 16.9.1, 16.9.1s, 16.9.2, 16.9.3a, 16.9.3, 16.9.4, 16.9.5, 16.9.5f, 16.9.6, 16.9.7, 16.9.8, 16.10.1a, 16.10.1b, 16.10.1, 16.10.1c, 16.10.1d, 16.10.1e, 16.10.1f, 16.10.1g, 16.10.1s, 16.10.2, 16.10.3, 16.11.1a, 16.11.1b, 16.11.1, 16.11.1s, 16.11.2, 16.12 to before 16.12.10a, 16.12.10, 17.1.1a, 17.1.1, 17.1.1s, 17.1.1t, 17.1.3, 17.2.1a, 17.2.1, 17.2.1r, 17.2.1v, 17.2.2, 17.2.3, 17.3 to before 17.3.8a, 17.3.8, 17.4.1a, 17.4.1b, 17.4.1, 17.4.2a, 17.4.2, 17.5.1a, 17.5.1b, 17.5.1, 17.5.1c, 17.6 to before 17.6.6a, 17.6.6, 17.7.1a, 17.7.1b, 17.7.1, 17.7.2, 17.8.1a, 17.8.1, 17.9 to before 17.9.4a, 17.9.4, 17.10.1a, 17.10.1b, 17.10.1, 17.11.1a, 17.11.1, 17.11.99sw, 17.12.1a, 17.12.1
- [CVE-2021-1435](https://www.precursorintelligence.com/what-is/cve-2021-1435) (Cisco IOS XE Web UI Command Injection Vulnerability): 16.9.1a, 16.9.1b, 16.9.1, 16.9.1c, 16.9.1d, 16.9.1s, 16.9.2a, 16.9.2, 16.9.2s, 16.9.3a, 16.9.3, 16.9.3h, 16.9.3s, 16.9.4, 16.9.4c, 16.9.5, 16.9.5f, 16.9.6, 16.10.1a, 16.10.1b, 16.10.1, 16.10.1c, 16.10.1d, 16.10.1e, 16.10.1f, 16.10.1g, 16.10.1s, 16.10.2, 16.10.3, 16.11.1a, 16.11.1b, 16.11.1, 16.11.1c, 16.11.1s, 16.11.2, 17.2.1v
- [CVE-2023-20198](https://www.precursorintelligence.com/what-is/cve-2023-20198) (Cisco IOS XE Web UI Privilege Escalation Vulnerability): 16.12 to before 16.12.10a, 17.3 to before 17.3.8a, 17.6 to before 17.6.6a, 17.9 to before 17.9.4a
- [CVE-2023-44487](https://www.precursorintelligence.com/what-is/cve-2023-44487) (HTTP/2 Rapid Reset Attack Vulnerability): before 17.15.1
- [CVE-2023-20109](https://www.precursorintelligence.com/what-is/cve-2023-20109) (Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability): 3.3.0sg, 3.3.1sg, 3.3.2sg, 3.4.0sg, 3.4.1sg, 3.4.2sg, 3.4.3sg, 3.4.4sg, 3.4.5sg, 3.4.6sg, 3.4.7sg, 3.4.8sg, 3.5.0e, 3.5.1e, 3.5.2e, 3.5.3e, 3.6.0e, 3.6.1e, 3.6.2ae, 3.6.2e, 3.6.3e, 3.6.4e, 3.6.5ae, 3.6.5be, 3.6.5e, 3.6.6e, 3.6.7be, 3.6.7e, 3.6.8e, 3.6.9e, 3.6.10e, 3.7.0bs, 3.7.0s, 3.7.1as, 3.7.1s, 3.7.2s, 3.7.2ts, 3.7.3s, 3.7.4as, 3.7.4s, 3.7.5s, 3.7.6s, 3.7.7s, 3.8.0e, 3.8.0s, 3.8.1e, 3.8.1s, 3.8.2e, 3.8.2s, 3.8.3e, 3.8.4e, 3.8.5ae, 3.8.5e, 3.8.6e, 3.8.7e, 3.8.8e, 3.8.9e, 3.8.10e, 3.9.0as, 3.9.0e, 3.9.0s, 3.9.1as, 3.9.1e, 3.9.1s, 3.9.2e, 3.9.2s, 3.10.0ce, 3.10.0e, 3.10.0s, 3.10.1e, 3.10.1s, 3.10.1xbs, 3.10.2e, 3.10.2s, 3.10.2ts, 3.10.3e, 3.10.3s, 3.10.4s, 3.10.5s, 3.10.6s, 3.10.7s, 3.10.8as, 3.10.8s, 3.10.9s, 3.10.10s, 3.11.0e, 3.11.0s, 3.11.1ae, 3.11.1e, 3.11.1s, 3.11.2e, 3.11.2s, 3.11.3ae, 3.11.3e, 3.11.3s, 3.11.4e, 3.11.4s, 3.11.5e, 3.11.6e, 3.11.7e, 3.11.8e, 3.12.0as, 3.12.0s, 3.12.1s, 3.12.2s, 3.12.3s, 3.12.4s, 3.13.0as, 3.13.0s, 3.13.1s, 3.13.2as, 3.13.2s, 3.13.3s, 3.13.4s, 3.13.5as, 3.13.5s, 3.13.6as, 3.13.6s, 3.13.7as, 3.13.7s, 3.13.8s, 3.13.9s, 3.13.10s, 3.14.0s, 3.14.1s, 3.14.2s, 3.14.3s, 3.14.4s, 3.15.0s, 3.15.1cs, 3.15.1s, 3.15.2s, 3.15.3s, 3.15.4s, 3.16.0cs, 3.16.0s, 3.16.1as, 3.16.1s, 3.16.2as, 3.16.2bs, 3.16.2s, 3.16.3as, 3.16.3s, 3.16.4as, 3.16.4bs, 3.16.4ds, 3.16.4s, 3.16.5s, 3.16.6bs, 3.16.6s, 3.16.7as, 3.16.7bs, 3.16.7s, 3.16.8s, 3.16.9s, 3.16.10s, 3.17.0s, 3.17.1as, 3.17.1s, 3.17.2s, 3.17.3s, 3.17.4s, 3.18.0as, 3.18.0s, 3.18.0sp, 3.18.1asp, 3.18.1bsp, 3.18.1csp, 3.18.1s, 3.18.1sp, 3.18.2asp, 3.18.2s, 3.18.2sp, 3.18.3asp, 3.18.3bsp, 3.18.3s, 3.18.3sp, 3.18.4s, 3.18.4sp, 3.18.5sp, 3.18.6sp, 3.18.7sp, 3.18.8asp, 3.18.9sp, 16.1.1, 16.1.2, 16.1.3, 16.2.1, 16.2.2, 16.3.1a, 16.3.1, 16.3.2, 16.3.3, 16.3.4, 16.3.5b, 16.3.5, 16.3.6, 16.3.7, 16.3.8, 16.3.9, 16.3.10, 16.3.11, 16.4.1, 16.4.2, 16.4.3, 16.5.1a, 16.5.1b, 16.5.1, 16.5.2, 16.5.3, 16.6.1, 16.6.2, 16.6.3, 16.6.4a, 16.6.4, 16.6.5a, 16.6.5, 16.6.6, 16.6.7, 16.6.8, 16.6.9, 16.6.10, 16.7.1a, 16.7.1b, 16.7.1, 16.7.2, 16.7.3, 16.7.4, 16.8.1a, 16.8.1b, 16.8.1, 16.8.1c, 16.8.1d, 16.8.1e, 16.8.1s, 16.8.2, 16.8.3, 16.9.1a, 16.9.1b, 16.9.1, 16.9.1s, 16.9.2, 16.9.3a, 16.9.3, 16.9.4, 16.9.5, 16.9.5f, 16.9.6, 16.9.7, 16.9.8, 16.10.1a, 16.10.1b, 16.10.1, 16.10.1c, 16.10.1d, 16.10.1e, 16.10.1f, 16.10.1g, 16.10.1s, 16.10.2, 16.10.3, 16.11.1a, 16.11.1b, 16.11.1, 16.11.1s, 16.11.2, 16.12.1a, 16.12.1, 16.12.1c, 16.12.1s, 16.12.1t, 16.12.1w, 16.12.1x, 16.12.1y, 16.12.1z1, 16.12.1z2, 16.12.2a, 16.12.2, 16.12.2s, 16.12.3a, 16.12.3, 16.12.3s, 16.12.4a, 16.12.4, 16.12.5a, 16.12.5b, 16.12.5, 16.12.6a, 16.12.6, 16.12.7, 16.12.8, 16.12.9, 17.1.1a, 17.1.1, 17.1.1s, 17.1.1t, 17.1.3, 17.2.1a, 17.2.1, 17.2.1r, 17.2.1v, 17.2.2, 17.2.3, 17.3.1a, 17.3.1, 17.3.1w, 17.3.1x, 17.3.1z, 17.3.2a, 17.3.2, 17.3.3, 17.3.4a, 17.3.4b, 17.3.4, 17.3.4c, 17.3.5a, 17.3.5b, 17.3.5, 17.3.6, 17.3.7, 17.4.1a, 17.4.1b, 17.4.1, 17.4.2a, 17.4.2, 17.5.1a, 17.5.1, 17.5.1c, 17.6.1a, 17.6.1, 17.6.1w, 17.6.1x, 17.6.1y, 17.6.1z, 17.6.1z1, 17.6.2, 17.6.3a, 17.6.3, 17.6.4, 17.6.5a, 17.6.5, 17.7.1a, 17.7.1b, 17.7.1, 17.7.2, 17.8.1a, 17.8.1, 17.9.1a, 17.9.1, 17.9.1w, 17.9.1x, 17.9.1x1, 17.9.1y, 17.9.1y1, 17.9.2a, 17.9.2, 17.9.3a, 17.9.3, 17.10.1a, 17.10.1b, 17.10.1, 17.11.1a, 17.11.1, 17.11.99sw
- [CVE-2016-6415](https://www.precursorintelligence.com/what-is/cve-2016-6415) (Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerability): up to 3.18s
- [CVE-2017-6742](https://www.precursorintelligence.com/what-is/cve-2017-6742) (Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability): 2.2.0 to 3.17
- [CVE-2017-3881](https://www.precursorintelligence.com/what-is/cve-2017-3881) (Cisco IOS and IOS XE Remote Code Execution Vulnerability): 3.2sg to 3.9e
- [CVE-2017-6739](https://www.precursorintelligence.com/what-is/cve-2017-6739) (Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability): 2.2.0 to 3.17.0
- [CVE-2017-6740](https://www.precursorintelligence.com/what-is/cve-2017-6740) (Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability): 2.2.0 to 3.17
- [CVE-2017-6743](https://www.precursorintelligence.com/what-is/cve-2017-6743) (Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability): 2.2.0 to 3.17
- [CVE-2018-0151](https://www.precursorintelligence.com/what-is/cve-2018-0151) (Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerability): 16.5.1
- [CVE-2018-0155](https://www.precursorintelligence.com/what-is/cve-2018-0155) (Cisco Catalyst Bidirectional Forwarding Detection Denial-of-Service Vulnerability): 3.6(2)e
- [CVE-2018-0156](https://www.precursorintelligence.com/what-is/cve-2018-0156) (Cisco IOS Software and Cisco IOS XE Software Smart Install Denial-of-Service Vulnerability): 15.2(2a)ja, 15.2(2)e4
- [CVE-2018-0158](https://www.precursorintelligence.com/what-is/cve-2018-0158) (Cisco IOS and XE Software Internet Key Exchange Memory Leak Vulnerability): 15.5(3)s1.1, 15.5(3)s1.2, 15.5(3)s1.4, 15.5(3)s1.5, 15.5(3)s1.7, 15.5(3)s1.8, 15.5(3)s1.9, 15.5(3)s1.10, 15.5(3)s1.11, 15.5(3)s1.12
- [CVE-2018-0159](https://www.precursorintelligence.com/what-is/cve-2018-0159) (Cisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Vulnerability): 15.3(3)s
- [CVE-2018-0167](https://www.precursorintelligence.com/what-is/cve-2018-0167) (Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability): up to 15.6.3m1, up to 15.2(6)e0a, up to 15.2(4a)ea5
- [CVE-2018-0173](https://www.precursorintelligence.com/what-is/cve-2018-0173) (Cisco IOS and IOS XE Software Improper Input Validation Vulnerability): up to 15.2(6)e0a, up to 15.2(4a)ea5
- [CVE-2018-0174](https://www.precursorintelligence.com/what-is/cve-2018-0174) (Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Vulnerability): up to 15.2(4a)ea5, up to 15.2(6)e0a
- [CVE-2018-0175](https://www.precursorintelligence.com/what-is/cve-2018-0175) (Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability): up to 15.2(4a)ea5, up to 15.2(6)e0a, up to 15.6.3m1
- [CVE-2017-6736](https://www.precursorintelligence.com/what-is/cve-2017-6736) (Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability): 2.2.0 to 3.17
- [CVE-2017-6663](https://www.precursorintelligence.com/what-is/cve-2017-6663) (Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerability): 3.7.0e, 3.7.1e, 3.7.3e, 3.8.0e, 3.8.0ex, 3.8.1e, 3.8.2e, 3.8.3e, 3.9.0e, 3.9.1e, 3.10.4s, 3.10.8as, 3.10.8s, 3.11.3s, 3.11.4s, 3.12.0as, 3.12.0s, 3.12.1s, 3.12.2s, 3.12.3s, 3.12.4s, 3.13.0s, 3.13.1s, 3.13.2as, 3.13.2s, 3.13.4s, 3.13.5as, 3.13.5s, 3.13.6as, 3.13.6s, 3.13.7as, 3.13.8s, 3.14.0s, 3.14.1s, 3.14.2s, 3.14.3s, 3.14.4s, 3.15.0s, 3.15.1s, 3.15.2s, 3.15.3s, 3.15.4s, 3.16.0s, 3.16.1as, 3.16.2as, 3.16.2s, 3.16.3as, 3.16.3s, 3.16.4as, 3.16.4ds, 3.16.4s, 3.16.6s, 3.17.0s, 3.17.1as, 3.17.1s, 3.17.3s, 3.17.4s, 3.18.0as, 3.18.0s, 3.18.0sp, 3.18.1bsp, 3.18.1s, 3.18.1sp, 3.18.2asp, 3.18.2s, 3.18.2sp, 3.18.3s, 3.18.3sp, 16.6.1
- [CVE-2017-6627](https://www.precursorintelligence.com/what-is/cve-2017-6627) (Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Vulnerability): 3.14.0s, 3.14.1s, 3.14.2s, 3.14.3s, 3.14.4s, 3.15.0s, 3.15.1cs, 3.15.1s, 3.15.2s, 3.15.3s, 3.15.4s, 3.16.0cs, 3.16.0s, 3.16.1as, 3.16.1s, 3.16.2as, 3.16.2bs, 3.16.2s, 3.16.3as, 3.16.3s, 3.16.4as, 3.16.4bs, 3.16.4ds, 3.16.4s, 3.16.5s, 3.16.6s, 3.17.0s, 3.17.1as, 3.17.1s, 3.17.3s, 3.18.0as, 3.18.0s, 3.18.1s, 3.18.2s, 3.18.3s, 3.18.3vs
- [CVE-2017-12319](https://www.precursorintelligence.com/what-is/cve-2017-12319) (Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Vulnerability): before 16.3
- [CVE-2017-6737](https://www.precursorintelligence.com/what-is/cve-2017-6737) (Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability): 2.2.0 to 3.17.0
- [CVE-2017-12237](https://www.precursorintelligence.com/what-is/cve-2017-12237) (Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Vulnerability): 3.5.0e to 16.5
- [CVE-2017-6738](https://www.precursorintelligence.com/what-is/cve-2017-6738) (Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability): 2.2.0 to 3.17.0

1 more exploited flaw names IOS XE without a version of its own (for example as the system other affected software runs on). They are in the list below.

## Which IOS XE vulnerabilities are being exploited?

29 flaws are on the government list of vulnerabilities known to be exploited, newest first:

- [CVE-2025-20352](https://www.precursorintelligence.com/what-is/cve-2025-20352): Cisco IOS and IOS XE Software SNMP Denial of Service and Remote Code Execution Vulnerability. High, CVSS 7.7, chance of use in 30 days 42%, known exploited since 29 September 2025.
- [CVE-2023-20273](https://www.precursorintelligence.com/what-is/cve-2023-20273): Cisco IOS XE Web UI Command Injection Vulnerability. High, CVSS 7.2, chance of use in 30 days 93%, known exploited since 23 October 2023.
- [CVE-2021-1435](https://www.precursorintelligence.com/what-is/cve-2021-1435): Cisco IOS XE Web UI Command Injection Vulnerability. High, CVSS 7.2, chance of use in 30 days 8.5%, known exploited since 19 October 2023.
- [CVE-2023-20198](https://www.precursorintelligence.com/what-is/cve-2023-20198): Cisco IOS XE Web UI Privilege Escalation Vulnerability. Critical, CVSS 10.0, chance of use in 30 days >99%, known exploited since 16 October 2023.
- [CVE-2023-44487](https://www.precursorintelligence.com/what-is/cve-2023-44487): HTTP/2 Rapid Reset Attack Vulnerability. High, CVSS 7.5, chance of use in 30 days >99%, known exploited since 10 October 2023.
- [CVE-2023-20109](https://www.precursorintelligence.com/what-is/cve-2023-20109): Cisco IOS and IOS XE Group Encrypted Transport VPN Out-of-Bounds Write Vulnerability. Medium, CVSS 6.6, chance of use in 30 days 2.5%, known exploited since 10 October 2023.
- [CVE-2016-6415](https://www.precursorintelligence.com/what-is/cve-2016-6415): Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerability. High, CVSS 7.5, chance of use in 30 days 88%, known exploited since 19 May 2023.
- [CVE-2017-6742](https://www.precursorintelligence.com/what-is/cve-2017-6742): Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability. High, CVSS 8.8, chance of use in 30 days 21%, known exploited since 19 April 2023.
- [CVE-2017-3881](https://www.precursorintelligence.com/what-is/cve-2017-3881): Cisco IOS and IOS XE Remote Code Execution Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 99%, known exploited since 25 March 2022.
- [CVE-2017-6739](https://www.precursorintelligence.com/what-is/cve-2017-6739): Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability. High, CVSS 8.8, chance of use in 30 days 11%, known exploited since 3 March 2022.
- [CVE-2017-6740](https://www.precursorintelligence.com/what-is/cve-2017-6740): Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability. High, CVSS 8.8, chance of use in 30 days 11%, known exploited since 3 March 2022.
- [CVE-2017-6743](https://www.precursorintelligence.com/what-is/cve-2017-6743): Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability. High, CVSS 8.8, chance of use in 30 days 11%, known exploited since 3 March 2022.
- [CVE-2018-0151](https://www.precursorintelligence.com/what-is/cve-2018-0151): Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 14%, known exploited since 3 March 2022.
- [CVE-2018-0155](https://www.precursorintelligence.com/what-is/cve-2018-0155): Cisco Catalyst Bidirectional Forwarding Detection Denial-of-Service Vulnerability. High, CVSS 8.6, chance of use in 30 days 7.7%, known exploited since 3 March 2022.
- [CVE-2018-0156](https://www.precursorintelligence.com/what-is/cve-2018-0156): Cisco IOS Software and Cisco IOS XE Software Smart Install Denial-of-Service Vulnerability. High, CVSS 7.5, chance of use in 30 days 9.4%, known exploited since 3 March 2022.
- [CVE-2018-0158](https://www.precursorintelligence.com/what-is/cve-2018-0158): Cisco IOS and XE Software Internet Key Exchange Memory Leak Vulnerability. High, CVSS 8.6, chance of use in 30 days 7.2%, known exploited since 3 March 2022.
- [CVE-2018-0159](https://www.precursorintelligence.com/what-is/cve-2018-0159): Cisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Vulnerability. High, CVSS 7.5, chance of use in 30 days 6.9%, known exploited since 3 March 2022.
- [CVE-2018-0167](https://www.precursorintelligence.com/what-is/cve-2018-0167): Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability. High, CVSS 8.8, chance of use in 30 days 3.4%, known exploited since 3 March 2022.
- [CVE-2018-0172](https://www.precursorintelligence.com/what-is/cve-2018-0172): Cisco IOS and IOS XE Software Improper Input Validation Vulnerability. High, CVSS 8.6, chance of use in 30 days 7.8%, known exploited since 3 March 2022.
- [CVE-2018-0173](https://www.precursorintelligence.com/what-is/cve-2018-0173): Cisco IOS and IOS XE Software Improper Input Validation Vulnerability. High, CVSS 8.6, chance of use in 30 days 7.6%, known exploited since 3 March 2022.
- [CVE-2018-0174](https://www.precursorintelligence.com/what-is/cve-2018-0174): Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Vulnerability. High, CVSS 8.6, chance of use in 30 days 7.6%, known exploited since 3 March 2022.
- [CVE-2018-0175](https://www.precursorintelligence.com/what-is/cve-2018-0175): Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability. High, CVSS 8.0, chance of use in 30 days 3.5%, known exploited since 3 March 2022.
- [CVE-2017-6736](https://www.precursorintelligence.com/what-is/cve-2017-6736): Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability. High, CVSS 8.8, chance of use in 30 days 70%, known exploited since 3 March 2022.
- [CVE-2017-6663](https://www.precursorintelligence.com/what-is/cve-2017-6663): Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerability. Medium, CVSS 6.5, chance of use in 30 days 2.1%, known exploited since 3 March 2022.
- [CVE-2017-6627](https://www.precursorintelligence.com/what-is/cve-2017-6627): Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Vulnerability. High, CVSS 7.5, chance of use in 30 days 6.2%, known exploited since 3 March 2022.
- [CVE-2017-12319](https://www.precursorintelligence.com/what-is/cve-2017-12319): Cisco IOS XE Software Ethernet Virtual Private Network Border Gateway Protocol Denial-of-Service Vulnerability. Medium, CVSS 5.9, chance of use in 30 days 5.2%, known exploited since 3 March 2022.
- [CVE-2017-6737](https://www.precursorintelligence.com/what-is/cve-2017-6737): Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability. High, CVSS 8.8, chance of use in 30 days 45%, known exploited since 3 March 2022.
- [CVE-2017-12237](https://www.precursorintelligence.com/what-is/cve-2017-12237): Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Vulnerability. High, CVSS 7.5, chance of use in 30 days 7.1%, known exploited since 3 March 2022.
- [CVE-2017-6738](https://www.precursorintelligence.com/what-is/cve-2017-6738): Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability. High, CVSS 8.8, chance of use in 30 days 11%, known exploited since 3 March 2022.

## Which IOS XE flaws are most likely to be used?

Ranked by the latest exploit-likelihood forecast (the chance each flaw is used in an attack in the next 30 days):

- [CVE-2023-44487](https://www.precursorintelligence.com/what-is/cve-2023-44487): >99%, High (CVSS 7.5), known exploited
- [CVE-2017-3881](https://www.precursorintelligence.com/what-is/cve-2017-3881): 99%, Critical (CVSS 9.8), known exploited
- [CVE-2023-20273](https://www.precursorintelligence.com/what-is/cve-2023-20273): 93%, High (CVSS 7.2), known exploited
- [CVE-2016-6415](https://www.precursorintelligence.com/what-is/cve-2016-6415): 88%, High (CVSS 7.5), known exploited
- [CVE-2017-6736](https://www.precursorintelligence.com/what-is/cve-2017-6736): 70%, High (CVSS 8.8), known exploited
- [CVE-2017-6737](https://www.precursorintelligence.com/what-is/cve-2017-6737): 45%, High (CVSS 8.8), known exploited
- [CVE-2025-20352](https://www.precursorintelligence.com/what-is/cve-2025-20352): 42%, High (CVSS 7.7), known exploited
- [CVE-2021-1384](https://www.precursorintelligence.com/what-is/cve-2021-1384): 35%, High (CVSS 7.2)
- [CVE-2019-12650](https://www.precursorintelligence.com/what-is/cve-2019-12650): 29%, High (CVSS 8.8)

## Questions

### How many vulnerabilities does IOS XE have?

We track 506 published vulnerabilities listed under the name IOS XE, across 1,101 versions. The most recent IOS XE flaw added to the known-exploited list is CVE-2025-20352, on 29 September 2025.

### Which IOS XE vulnerabilities are being exploited?

29 are on the list of flaws known to be exploited. The most recently added are CVE-2025-20352, CVE-2023-20273 and CVE-2021-1435.

### Why are newer IOS XE flaws missing from this page?

Cisco also lists IOS XE under more specific names, such as Ios XE SD-WAN and Ios XE 3.4sg. Flaws listed only under those names are counted on their own pages, not here. Open the release you run to see its own list.

### Which versions of IOS XE do the exploited flaws affect?

Each flaw names its own versions, usually as ranges. The newest, CVE-2025-20352, affects 3.5.0e, 3.5.0sq, 3.5.1e, 3.5.1sq and more. The versions for every exploited flaw are listed on this page.

### How do I get alerts for IOS XE?

Create a Precursor Intelligence account and track IOS XE. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.

## Running IOS XE?

Precursor Intelligence keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

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