CVE-2019-1756 — Cisco IOS XE Software Command Injection Vulnerability

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HIGH

Cisco IOS XE Software Command Injection Vulnerability

Published Mar 28, 2019

7.2

HIGH

CVSS 3.0

EPSS 3.70%

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.

Affected products

Vendor Cisco Product Cisco IOS XE Software Default
n/a
- Version
  16.7.1
  Status
  affected
  Constraints
  -
- Version
  16.7.1a
  Status
  affected
  Constraints
  -
- Version
  16.7.1b
  Status
  affected
  Constraints
  -
- Version
  16.7.2
  Status
  affected
  Constraints
  -
- Version
  16.7.3
  Status
  affected
  Constraints
  -
- Version
  16.8.1
  Status
  affected
  Constraints
  -
- Version
  16.8.1a
  Status
  affected
  Constraints
  -
- Version
  16.8.1b
  Status
  affected
  Constraints
  -
- Version
  16.8.1c
  Status
  affected
  Constraints
  -
- Version
  16.8.1d
  Status
  affected
  Constraints
  -
- Version
  16.8.1e
  Status
  affected
  Constraints
  -
- Version
  16.8.1s
  Status
  affected
  Constraints
  -
- Version
  16.8.2
  Status
  affected
  Constraints
  -
- Version
  3.2.0JA
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Cisco

Cisco IOS XE Software

n/a

Version	Status	Constraints
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	-
16.8.1c	affected	-
16.8.1d	affected	-
16.8.1e	affected	-
16.8.1s	affected	-
16.8.2	affected	-
3.2.0JA	affected	-

Remediation

No remediation recorded yet.

Metrics

3.70% 0.03698

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.03698

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (16 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	3.70% (0.03698)	89.39th	v5 (v2026.06.15)
Jun 15, 2026	3.77% (0.03767)	88.48th	v5 (v2026.06.15)
Mar 30, 2025	0.66% (0.00665)	68.86th	v4 (v2025.03.14)
Mar 29, 2025	1.98% (0.01977)	72.70th	v4 (v2025.03.14)
Mar 17, 2025	0.66% (0.00665)	69.52th	v4 (v2025.03.14)
Dec 12, 2024	0.24% (0.00237)	62.67th	v3 (v2023.03.01)
May 6, 2023	0.24% (0.00237)	60.32th	v3 (v2023.03.01)
Mar 7, 2023	0.17% (0.00167)	51.61th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Sep 17, 2022	1.05% (0.01055)	50.47th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Feb 4, 2022	10.85% (0.10855)	88.34th	v2 (v2022.01.01)
Feb 3, 2022	6.23% (0.06231)	82.49th	v1
Jan 6, 2022	6.23% (0.06231)	82.32th	v1
Sep 1, 2021	1.46% (0.01459)	72.46th	v1
Apr 14, 2021	1.46% (0.01459)	0.00th	v1

Weaknesses (1)

CWE-20

Improper Input Validation

References (2)

http://www.securityfocus.com/bid/107598
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-iosxe-cmdinject
vendor-advisoryx_refsource_CISCOPatchVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/107598		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-iosxe-cmdinject		vendor-advisoryx_refsource_CISCOPatchVendor Advisory