PT-2020-4174 · Cisco · Cisco Ios Xe+1

Published 2020-09-24 · Updated 2023-05-23 · CVE-2020-3511

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions: Cisco IOS Software and Cisco IOS XE Software (affected versions not specified)

Description: A vulnerability in the ISDN subsystem could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The issue is due to insufficient input validation when the ISDN Q.931 messages are processed. An attacker could exploit this by sending a malicious ISDN Q.931 message to an affected device, potentially causing the process to crash and resulting in a reload of the device.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2020-04596

CVE-2020-3511

Affected Products

Cisco Ios

Cisco Ios Xe

References · 6

• https://osv.dev/vulnerability/CVE-2020-3511 · Vendor Advisory
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-isdn-q931-dos-67eUZBTf · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-04596 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-isdn-q931-dos-67eUZBTf · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-3511 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/657130 · Security Note