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CVE-2019-1756

Cisco IOS XE Software Command Injection Vulnerability

Description

A vulnerability in Cisco IOS XE Software could allow an authenticated, remote attacker to execute commands on the underlying Linux shell of an affected device with root privileges. The vulnerability occurs because the affected software improperly sanitizes user-supplied input. An attacker who has valid administrator access to an affected device could exploit this vulnerability by supplying a username with a malicious payload in the web UI and subsequently making a request to a specific endpoint in the web UI. A successful exploit could allow the attacker to run arbitrary commands as the root user, allowing complete compromise of the system.

Timeline

  1. ID reserved

    By cisco

  2. · 4 months later

    Published

  3. · 6 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2019-1756, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.0High7.2CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Modified3.0High7.2CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
3.7% · top 10% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.

Affected products

  • Cisco · Cisco IOS XE Software

    • affected 3.2.0JA
    • affected 16.7.1
    • affected 16.7.1a
    • affected 16.7.1b
    • affected 16.7.2
    • affected 16.7.3
    • affected 16.8.1
    • affected 16.8.1a
    • affected 16.8.1b
    • affected 16.8.1s
    • affected 16.8.1c
    • affected 16.8.1d
    • affected 16.8.2
    • affected 16.8.1e

What to do

Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .