---
id: CVE-2025-20192
title: >-
  A vulnerability in the Internet Key Exchange version 1 (IKEv1) implementation
  of Cisco IOS XE Software could allow an authenticated, remote attacker to
  cause a denial of service (DoS) condition
summary: >-
  A vulnerability in the Internet Key Exchange version 1 (IKEv1) implementation
  of Cisco IOS XE Software could allow an authenticated, remote attacker to
  cause a denial of service (DoS) condition. The attacker must have valid IKEv1
  VPN cre…
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-232
vendor: cisco
product: ios_xe
affected:
  - ios_xe = 3.13.0s
  - ios_xe = 3.13.1s
  - ios_xe = 3.13.2s
  - ios_xe = 3.13.3s
  - ios_xe = 3.13.4s
  - ios_xe = 3.13.5s
  - ios_xe = 3.13.6as
  - ios_xe = 3.13.6s
  - ios_xe = 3.13.7s
  - ios_xe = 3.13.8s
  - ios_xe = 3.13.9s
  - ios_xe = 3.13.10s
  - ios_xe = 3.14.0s
  - ios_xe = 3.14.1s
  - ios_xe = 3.14.2s
  - ios_xe = 3.14.3s
  - ios_xe = 3.14.4s
  - ios_xe = 3.15.0s
  - ios_xe = 3.15.1cs
  - ios_xe = 3.15.1s
  - ios_xe = 3.15.2s
  - ios_xe = 3.15.3s
  - ios_xe = 3.15.4s
  - ios_xe = 3.16.0cs
  - ios_xe = 3.16.0s
  - ios_xe = 3.16.1as
  - ios_xe = 3.16.2s
  - ios_xe = 3.16.3s
  - ios_xe = 3.16.4as
  - ios_xe = 3.16.4bs
  - ios_xe = 3.16.4ds
  - ios_xe = 3.16.5s
  - ios_xe = 3.16.6bs
  - ios_xe = 3.16.6s
  - ios_xe = 3.16.7as
  - ios_xe = 3.16.7bs
  - ios_xe = 3.16.7s
  - ios_xe = 3.16.8s
  - ios_xe = 3.16.9s
  - ios_xe = 3.16.10s
  - ios_xe = 3.17.0s
  - ios_xe = 3.17.1s
  - ios_xe = 3.17.2s
  - ios_xe = 3.17.3s
  - ios_xe = 3.17.4s
  - ios_xe = 3.18.2asp
  - ios_xe = 16.2.1
  - ios_xe = 16.2.2
  - ios_xe = 16.3.1
  - ios_xe = 16.3.1a
  - ios_xe = 16.3.2
  - ios_xe = 16.3.3
  - ios_xe = 16.3.4
  - ios_xe = 16.3.5
  - ios_xe = 16.3.6
  - ios_xe = 16.3.7
  - ios_xe = 16.3.8
  - ios_xe = 16.3.9
  - ios_xe = 16.3.10
  - ios_xe = 16.3.11
  - ios_xe = 16.4.1
  - ios_xe = 16.4.2
  - ios_xe = 16.4.3
  - ios_xe = 16.5.1
  - ios_xe = 16.5.1b
  - ios_xe = 16.5.2
  - ios_xe = 16.5.3
  - ios_xe = 16.6.1
  - ios_xe = 16.6.2
  - ios_xe = 16.6.3
  - ios_xe = 16.6.4
  - ios_xe = 16.6.5
  - ios_xe = 16.6.6
  - ios_xe = 16.6.7
  - ios_xe = 16.6.8
  - ios_xe = 16.6.9
  - ios_xe = 16.6.10
  - ios_xe = 16.7.1
  - ios_xe = 16.7.2
  - ios_xe = 16.7.3
  - ios_xe = 16.8.1
  - ios_xe = 16.8.1s
  - ios_xe = 16.8.2
  - ios_xe = 16.8.3
  - ios_xe = 16.9.1
  - ios_xe = 16.9.1s
  - ios_xe = 16.9.2
  - ios_xe = 16.9.3
  - ios_xe = 16.9.4
  - ios_xe = 16.9.5
  - ios_xe = 16.9.6
  - ios_xe = 16.9.7
  - ios_xe = 16.9.8
  - ios_xe = 16.10.1
  - ios_xe = 16.10.1a
  - ios_xe = 16.10.1b
  - ios_xe = 16.10.1e
  - ios_xe = 16.10.1s
  - ios_xe = 16.10.2
  - ios_xe = 16.10.3
published: '2025-05-07'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T15:21:10.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-20192'
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-ikev1-dos-XHk3HzFC
    label: psirt@cisco.com
tags:
  - nvd
epss: 0.00439
epssPercentile: 0.35642
ingestedAt: '2026-09-28T15:13:31.573Z'
---

## Overview

A vulnerability in the Internet Key Exchange version 1 (IKEv1) implementation of Cisco IOS XE Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition. The attacker must have valid IKEv1 VPN credentials to exploit this vulnerability.

 This vulnerability is due to improper validation of IKEv1 phase 2 parameters before the IPsec security association creation request is handed off to the hardware cryptographic accelerator of an affected device. An attacker could exploit this vulnerability by sending crafted IKEv1 messages to the affected device. A successful exploit could allow the attacker to cause the device to reload.

## Affected

- `ios_xe = 3.13.0s`
- `ios_xe = 3.13.1s`
- `ios_xe = 3.13.2s`
- `ios_xe = 3.13.3s`
- `ios_xe = 3.13.4s`
- `ios_xe = 3.13.5s`
- `ios_xe = 3.13.6as`
- `ios_xe = 3.13.6s`
- `ios_xe = 3.13.7s`
- `ios_xe = 3.13.8s`
- `ios_xe = 3.13.9s`
- `ios_xe = 3.13.10s`
- `ios_xe = 3.14.0s`
- `ios_xe = 3.14.1s`
- `ios_xe = 3.14.2s`
- `ios_xe = 3.14.3s`
- `ios_xe = 3.14.4s`
- `ios_xe = 3.15.0s`
- `ios_xe = 3.15.1cs`
- `ios_xe = 3.15.1s`
- `ios_xe = 3.15.2s`
- `ios_xe = 3.15.3s`
- `ios_xe = 3.15.4s`
- `ios_xe = 3.16.0cs`
- `ios_xe = 3.16.0s`
- `ios_xe = 3.16.1as`
- `ios_xe = 3.16.2s`
- `ios_xe = 3.16.3s`
- `ios_xe = 3.16.4as`
- `ios_xe = 3.16.4bs`
- `ios_xe = 3.16.4ds`
- `ios_xe = 3.16.5s`
- `ios_xe = 3.16.6bs`
- `ios_xe = 3.16.6s`
- `ios_xe = 3.16.7as`
- `ios_xe = 3.16.7bs`
- `ios_xe = 3.16.7s`
- `ios_xe = 3.16.8s`
- `ios_xe = 3.16.9s`
- `ios_xe = 3.16.10s`
- `ios_xe = 3.17.0s`
- `ios_xe = 3.17.1s`
- `ios_xe = 3.17.2s`
- `ios_xe = 3.17.3s`
- `ios_xe = 3.17.4s`
- `ios_xe = 3.18.2asp`
- `ios_xe = 16.2.1`
- `ios_xe = 16.2.2`
- `ios_xe = 16.3.1`
- `ios_xe = 16.3.1a`
- `ios_xe = 16.3.2`
- `ios_xe = 16.3.3`
- `ios_xe = 16.3.4`
- `ios_xe = 16.3.5`
- `ios_xe = 16.3.6`
- `ios_xe = 16.3.7`
- `ios_xe = 16.3.8`
- `ios_xe = 16.3.9`
- `ios_xe = 16.3.10`
- `ios_xe = 16.3.11`
- `ios_xe = 16.4.1`
- `ios_xe = 16.4.2`
- `ios_xe = 16.4.3`
- `ios_xe = 16.5.1`
- `ios_xe = 16.5.1b`
- `ios_xe = 16.5.2`
- `ios_xe = 16.5.3`
- `ios_xe = 16.6.1`
- `ios_xe = 16.6.2`
- `ios_xe = 16.6.3`
- `ios_xe = 16.6.4`
- `ios_xe = 16.6.5`
- `ios_xe = 16.6.6`
- `ios_xe = 16.6.7`
- `ios_xe = 16.6.8`
- `ios_xe = 16.6.9`
- `ios_xe = 16.6.10`
- `ios_xe = 16.7.1`
- `ios_xe = 16.7.2`
- `ios_xe = 16.7.3`
- `ios_xe = 16.8.1`
- `ios_xe = 16.8.1s`
- `ios_xe = 16.8.2`
- `ios_xe = 16.8.3`
- `ios_xe = 16.9.1`
- `ios_xe = 16.9.1s`
- `ios_xe = 16.9.2`
- `ios_xe = 16.9.3`
- `ios_xe = 16.9.4`
- `ios_xe = 16.9.5`
- `ios_xe = 16.9.6`
- `ios_xe = 16.9.7`
- `ios_xe = 16.9.8`
- `ios_xe = 16.10.1`
- `ios_xe = 16.10.1a`
- `ios_xe = 16.10.1b`
- `ios_xe = 16.10.1e`
- `ios_xe = 16.10.1s`
- `ios_xe = 16.10.2`
- `ios_xe = 16.10.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.