PT-2019-3265 · Cisco · Cisco Nx-Os+2

Published 2019-08-28 · Updated 2019-10-09 · CVE-2019-1963

Positive Technologies (AI Summary)

CVSS v3.1

7.7

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco FXOS Software (affected versions not specified) Cisco NX-OS Software (affected versions not specified)

Description The issue is due to improper validation of Abstract Syntax Notation One (ASN.1)-encoded variables in SNMP packets. An attacker could exploit this by sending a crafted SNMP packet to the SNMP daemon on the affected device, potentially causing the SNMP application to restart multiple times and leading to a system-level restart and a denial of service (DoS) condition.

Recommendations For Cisco FXOS Software, update to a version that includes the fix for this issue. For Cisco NX-OS Software, update to a version that includes the fix for this issue. As a temporary workaround, consider restricting access to the SNMP daemon to minimize the risk of exploitation.

Fix

DoS

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2019-03287

CVE-2019-1963

Affected Products

Cisco Fxos

Cisco Nx-Os

Cisco Nexus

References · 4

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-fxnxos-snmp-dos · Vendor Advisory
• https://bdu.fstec.ru/vul/2019-03287 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2019-1963 · Security Note
• https://osv.dev/vulnerability/CVE-2019-1963 · Vendor Advisory