CVE-2017-3819

What it is

A privilege escalation vulnerability in the Secure Shell (SSH) subsystem in the StarOS operating system for Cisco ASR 5000 Series, ASR 5500 Series, ASR 5700 Series devices, and Cisco Virtualized Packet Core could allow an authenticated, remote attacker to gain unrestricted, root shell access. The vulnerability is due to missing input validation of parameters passed during SSH or SFTP login. An attacker could exploit this vulnerability by providing crafted user input to the SSH or SFTP command-line interface (CLI) during SSH or SFTP login. An exploit could allow an authenticated attacker to gain root privileges access on the router. Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability can be triggered via both IPv4 and IPv6 traffic. An established TCP connection toward port 22, the SSH default port, is needed to perform the attack. The attacker must have valid credentials to login to the system via SSH or SFTP. The following products have been confirmed to be vulnerable: Cisco ASR 5000/5500/5700 Series devices running StarOS after 17.7.0 and prior to 18.7.4, 19.5, and 20.2.3 with SSH configured are vulnerable. Cisco Virtualized Packet Core - Single Instance (VPC-SI) and Distributed Instance (VPC-DI) devices running StarOS prior to N4.2.7 (19.3.v7) and N4.7 (20.2.v0) with SSH configured are vulnerable. Cisco Bug IDs: CSCva65853.

At a glance

Exploitability

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

Exploit odds

3.3% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2017-03-15 20:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:18 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.3% in the next 30 days (EPSS).
• Severity: 8.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2017-03-15 20:59 UTC

Last modified

2026-06-17 01:18 UTC

Exploit probability

3.3% · EPSS, next 30 days

Weakness

CWE-264

Record status

Modified

Affected

• Cisco Asr 5000 Series Software 18.0.0
• Cisco Asr 5000 Series Software 18.0.0.57828
• Cisco Asr 5000 Series Software 18.0.0.59167
• Cisco Asr 5000 Series Software 18.0.0.59211
• Cisco Asr 5000 Series Software 18.0.l0.59219
• Cisco Asr 5000 Series Software 18.1.0
• Cisco Asr 5000 Series Software 18.1.0.59776
• Cisco Asr 5000 Series Software 18.1.0.59780

Attack profile CVSS 3.0 · 8.8

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

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-2017-3819.md and follow it. Check whether this project is affected by CVE-2017-3819. 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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