What is CVE-2017-3858?

CVE-2017-3858 is a high-severity vulnerability in Cisco iOS Xe, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2017-03-22.

How severe is CVE-2017-3858?

High severity. CVSS v3 base score is 8.8 out of 10.

Improper input validation in Cisco iOS Xe

CVE-2017-3858

A vulnerability in the web framework of Cisco IOS XE Software could allow an authenticated, remote attacker to inject arbitrary commands that are executed with root privileges. The vulnerability is due to insufficient input validation of HTTP parameters supplied by the user. An attacker could exploit this vulnerability by authenticating to the device and submitting crafted input to the affected web page parameter. The user must be authenticated to access the affected parameter. A successful exploit could allow the attacker to execute commands with root privileges. This vulnerability affects Cisco devices running Cisco IOS XE Software Release 16.2.1, if the HTTP Server feature is enabled for the device. The newly redesigned, web-based administration interface was introduced in the Denali 16.2 Release of Cisco IOS XE Software. The web-based administration interface in earlier releases of Cisco IOS XE Software is not affected by this vulnerability. Cisco Bug IDs: CSCuy83069.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2017-03-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.031 (87.5th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000

Affected products

Cisco iOS Xe — versions 16.2, 16.2.1
Cisco iOS Xe — versions Cisco IOS XE

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170322… (Vendor Advisory)
www.securitytracker.com/id/1038102 (vdb-entry)
www.securityfocus.com/bid/97009 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-3858?: CVE-2017-3858 is a high-severity vulnerability in Cisco iOS Xe, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2017-03-22.
How severe is CVE-2017-3858?: High severity. CVSS v3 base score is 8.8 out of 10.