CVE-2021-1443

Cisco IOS XE Software Web UI OS Command Injection Vulnerability

MEDIUM 5.5

At a glance

Source: NVD
EPSS: EPSS 2.34 % · percentile 84 (2026-10-28)
State: PUBLISHED
Published: 2021-03-24 20:06 UTC
Updated: 2024-11-08 23:35 UTC
Assigner: cisco
NVD status: Modified

Description

A vulnerability in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker to execute arbitrary code with root privileges on the underlying operating system of an affected device. The vulnerability exists because the affected software improperly sanitizes values that are parsed from a specific configuration file. An attacker could exploit this vulnerability by tampering with a specific configuration file and then sending an API call. A successful exploit could allow the attacker to inject arbitrary code that would be executed on the underlying operating system of the affected device. To exploit this vulnerability, the attacker would need to have a privileged set of credentials to the device.

Weaknesses (CWE)

CWE-77 — Improper Neutralization of Special Elements used in a Command
CWE-78 — Improper Neutralization of Special Elements used in an OS Command

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xe-os-cmd-inj-Ef6TV5e9

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N	cisco
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:N	NVD · psirt@cisco.com (Secondary)
CVSS 3.1	HIGH 7.2	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	HIGH 8.5	AV:N/AC:M/Au:S/C:C/I:C/A:C	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2021-6910
GCVE · GCVE-0-2021-1443

Affected configurations (NVD CPE)

cpe:2.3:o:cisco:ios_xe:16.9.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.1b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.1c:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.1d:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.2a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.2s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.3a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.3h:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.3s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.4c:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.9.5f:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.1b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.1c:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.1d:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.1e:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.1f:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.1g:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.10.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.11.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.11.1b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.11.1c:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.11.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.11.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.12.1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.12.1c:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.12.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.12.1t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:16.12.1w:*:*:*:*:*:*:*
+21 more

Affected products

Product	Versions
Cisco · Cisco IOS XE Software	affected n/a

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD