---
id: CVE-1999-1216
title: >-
  Cisco routers 9.17 and earlier allow remote attackers to bypass security
  restrictions via certain IP source routed packets that should normally be
  denied using the "no ip source-route" command.
summary: >-
  Cisco routers 9.17 and earlier allow remote attackers to bypass security
  restrictions via certain IP source routed packets that should normally be
  denied using the "no ip source-route" command.
severity: high
cvss: 7.5
cvssVector: 'AV:N/AC:L/Au:N/C:P/I:P/A:P'
published: '1993-04-22'
updated: '2026-06-16'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-1999-1216'
references:
  - url: 'http://ciac.llnl.gov/ciac/bulletins/d-15.shtml'
    label: cve@mitre.org
  - url: 'http://www.cert.org/advisories/CA-1993-07.html'
    label: cve@mitre.org
  - url: 'https://exchange.xforce.ibmcloud.com/vulnerabilities/541'
    label: cve@mitre.org
  - url: 'http://ciac.llnl.gov/ciac/bulletins/d-15.shtml'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.cert.org/advisories/CA-1993-07.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://exchange.xforce.ibmcloud.com/vulnerabilities/541'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.02081
epssPercentile: 0.80714
ingestedAt: '2026-06-19T03:39:00.716Z'
---

## Overview

Cisco routers 9.17 and earlier allow remote attackers to bypass security restrictions via certain IP source routed packets that should normally be denied using the "no ip source-route" command.

## Remediation

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