cisco-sa-20190327-isdn: Cisco IOS and IOS XE Software ISDN Interface Denial of Service Vulnerability
First published: Wed Mar 27 2019(Updated: )
A vulnerability in the ISDN functions of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the device to reload. The vulnerability is due to incorrect processing of specific values in the Q.931 information elements. An attacker could exploit this vulnerability by calling the affected device with specific Q.931 information elements being present. An exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition on an affected device. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-isdn 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.
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS | ||
| Cisco IOS XE Software |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-20190327-isdn?
The severity of cisco-sa-20190327-isdn is considered high due to its potential to cause a device reload by unauthenticated attackers.
How do I fix cisco-sa-20190327-isdn?
To fix cisco-sa-20190327-isdn, you should apply the appropriate security patches and updates provided by Cisco for affected IOS and IOS XE Software versions.
What is the impact of cisco-sa-20190327-isdn?
The impact of cisco-sa-20190327-isdn includes potential denial of service as the vulnerability allows remote attackers to cause device reloads.
Which software versions are affected by cisco-sa-20190327-isdn?
cisco-sa-20190327-isdn affects various versions of Cisco IOS Software and Cisco IOS XE Software.
Can cisco-sa-20190327-isdn be exploited remotely?
Yes, cisco-sa-20190327-isdn can be exploited remotely without authentication, making it particularly critical.
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