VIR Vulnerability Intelligence Relay

CVE-2017-3819

high
Published 2017-03-15 · Modified 2026-05-13
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
8.8
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4 NEW
—
not yet in upstream
VIR risk
8.8

Description

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.

Predictions

Exploit likelihood
92%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Application impact
VendorProductVersionsFixed
cisco ciscoasr_5000_series_software18.0.0
cisco ciscoasr_5000_series_software18.0.0.57828
cisco ciscoasr_5000_series_software18.0.0.59167
cisco ciscoasr_5000_series_software18.0.0.59211
cisco ciscoasr_5000_series_software18.0.l0.59219
cisco ciscoasr_5000_series_software18.1.0
cisco ciscoasr_5000_series_software18.1.0.59776
cisco ciscoasr_5000_series_software18.1.0.59780
cisco ciscoasr_5000_series_software18.1_base
cisco ciscoasr_5000_series_software18.3.0
cisco ciscoasr_5000_series_software18.3_base
cisco ciscoasr_5000_series_software18.4.0
cisco ciscoasr_5000_series_software19.0.1
cisco ciscoasr_5000_series_software19.0.m0.60737
cisco ciscoasr_5000_series_software19.0.m0.60828
cisco ciscoasr_5000_series_software19.0.m0.61045
cisco ciscoasr_5000_series_software19.1.0
cisco ciscoasr_5000_series_software19.1.0.61559
cisco ciscoasr_5000_series_software19.2.0
cisco ciscoasr_5000_series_software19.3.0
cisco ciscoasr_5000_series_software20.0.0
cisco ciscovirtualized_packet_corev18.0_base
cisco ciscovirtualized_packet_corev19.0_base
cisco ciscovirtualized_packet_corev20.0_base

References

CWEs

CWE-264 CWE-306

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.