---
id: CVE-2019-1748
title: >-
  Cisco IOS and IOS XE Software Network Plug-and-Play Agent Certificate
  Validation Vulnerability (CVE-2019-1748)
summary: "A vulnerability in the Cisco Network Plug-and-Play (PnP) agent of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to gain unauthorized access to sensitive data.\r\n\r\nThe vulnerability exists becau…"
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cvssSource: vendor
vendor: Cisco
product: IOS
affected:
  - ios_xe_software 3.9.1S
  - ios_xe_software 3.9.0S
  - ios_xe_software 3.3.0SE
  - ios_xe_software 3.3.1SE
  - ios_xe_software 3.5.0E
  - ios_xe_software 3.10.0S
  - ios_xe_software 3.10.1S
  - ios_xe_software 3.10.2S
  - ios_xe_software 3.11.1S
  - ios_xe_software 3.12.0S
  - ios_xe_software 3.11.2S
  - ios_xe_software 3.13.0S
  - ios_xe_software 3.10.3S
  - ios_xe_software 3.10.4S
  - ios_xe_software 3.9.2S
  - ios_xe_software 3.11.0S
  - ios_xe_software 3.10.5S
  - ios_xe_software 3.11.3S
  - ios_xe_software 3.12.1S
  - ios_xe_software 3.12.2S
  - ios_xe_software 3.5.1E
  - ios_xe_software 3.5.2E
  - ios_xe_software 3.5.3E
  - ios_xe_software 3.6.0E
  - ios_xe_software 3.6.1E
  - ios_xe_software 3.13.1S
  - ios_xe_software 3.13.2S
  - ios_xe_software 3.12.3S
  - ios_xe_software 3.14.0S
  - ios_xe_software 3.15.0S
  - ios_xe_software 3.14.1S
  - ios_xe_software 3.7.7S
  - ios_xe_software 3.10.6S
  - ios_xe_software 3.11.4S
  - ios_xe_software 3.14.2S
  - ios_xe_software 3.14.3S
  - ios_xe_software 3.14.4S
  - ios_xe_software 3.3.2SE
  - ios_xe_software 3.3.3SE
  - ios_xe_software 3.3.4SE
published: '2019-03-27'
updated: '2019-03-27'
sourceUpdated: '2019-03-27T16:00:00+00:00'
source: CSAF
sourceUrl: >-
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-pnp-cert
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-pnp-cert
  - url: 'https://software.cisco.com'
tags:
  - csaf
  - vendor-advisory
  - cisco
epss: 0.01183
epssPercentile: 0.67605
ingestedAt: '2026-10-18T12:01:17.951Z'
---

## Overview

A vulnerability in the Cisco Network Plug-and-Play (PnP) agent of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to gain unauthorized access to sensitive data.

The vulnerability exists because the affected software insufficiently validates certificates. An attacker could exploit this vulnerability by supplying a crafted certificate to an affected device. A successful exploit could allow the attacker to conduct man-in-the-middle attacks to decrypt and modify confidential information on user connections to the affected software.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.



This advisory is part of the March 27, 2019, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 17 Cisco Security Advisories that describe 19 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-71135"].

## Vendor advisories

- **cisco-sa-20190327-pnp-cert** · Cisco · affected: Cisco IOS XE Software (179 versions), IOS (704 versions) · updated 2019-03-27 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-pnp-cert)

**Cisco IOS and IOS XE Software Network Plug-and-Play Agent Certificate Validation Vulnerability**. Released 2019-03-27.

Affected:

- Cisco IOS XE Software 3.9.1S
- Cisco IOS XE Software 3.9.0S
- Cisco IOS XE Software 3.3.0SE
- Cisco IOS XE Software 3.3.1SE
- Cisco IOS XE Software 3.5.0E
- Cisco IOS XE Software 3.10.0S
- Cisco IOS XE Software 3.10.1S
- Cisco IOS XE Software 3.10.2S
- Cisco IOS XE Software 3.11.1S
- Cisco IOS XE Software 3.12.0S
- Cisco IOS XE Software 3.11.2S
- Cisco IOS XE Software 3.13.0S
- Cisco IOS XE Software 3.10.3S
- Cisco IOS XE Software 3.10.4S
- Cisco IOS XE Software 3.9.2S
- Cisco IOS XE Software 3.11.0S
- Cisco IOS XE Software 3.10.5S
- Cisco IOS XE Software 3.11.3S
- Cisco IOS XE Software 3.12.1S
- Cisco IOS XE Software 3.12.2S
- Cisco IOS XE Software 3.5.1E
- Cisco IOS XE Software 3.5.2E
- Cisco IOS XE Software 3.5.3E
- Cisco IOS XE Software 3.6.0E
- Cisco IOS XE Software 3.6.1E
- Cisco IOS XE Software 3.13.1S
- Cisco IOS XE Software 3.13.2S
- Cisco IOS XE Software 3.12.3S
- Cisco IOS XE Software 3.14.0S
- Cisco IOS XE Software 3.15.0S
- Cisco IOS XE Software 3.14.1S
- Cisco IOS XE Software 3.7.7S
- Cisco IOS XE Software 3.10.6S
- Cisco IOS XE Software 3.11.4S
- Cisco IOS XE Software 3.14.2S
- Cisco IOS XE Software 3.14.3S
- Cisco IOS XE Software 3.14.4S
- Cisco IOS XE Software 3.3.2SE
- Cisco IOS XE Software 3.3.3SE
- Cisco IOS XE Software 3.3.4SE

## Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com