CVE-2019-1963

What it is

A vulnerability in the Simple Network Management Protocol (SNMP) input packet processor of Cisco FXOS Software and Cisco NX-OS Software could allow an authenticated, remote attacker to cause the SNMP application on an affected device to restart unexpectedly. The vulnerability is due to improper validation of Abstract Syntax Notation One (ASN.1)-encoded variables in SNMP packets. An attacker could exploit this vulnerability by sending a crafted SNMP packet to the SNMP daemon on the affected device. A successful exploit could allow the attacker to cause the SNMP application to restart multiple times, leading to a system-level restart and a denial of service (DoS) condition.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of service disruption.

Exploit odds

1.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-08-28 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:29 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.6% in the next 30 days (EPSS).
• Severity: 7.7 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2019-08-28 19:15 UTC

Last modified

2026-06-17 02:29 UTC

Exploit probability

1.6% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Cisco nx-os < 6.2\(29\)
• Cisco nx-os < 8.4
• Cisco nx-os < 13.2\(7k\)
• Cisco nx-os < 14.0\(2c\)
• Cisco nx-os < 14.1\(1i\)
• Cisco nx-os < 9.2\(3\)
• Cisco nx-os < 7.1\(5\)n1\(1b\)
• Cisco nx-os < 7.3\(5\)n1\(1\)

Attack profile CVSS 3.0 · 7.7

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-1963.md and follow it. Check whether this project is affected by CVE-2019-1963. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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