CVE-2021-27821

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-27821
The Web Interface for OpenWRT LuCI version 19.07 and lower has been discovered to have a cross-site scripting vulnerability.

6.1 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

4.3 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:M/Au:N/C:N/I:P/A:N

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References
Link Resource
https://openwrt.org/advisory/start
https://openwrt.org/releases/19.07/start
Configurations

Configuration 1 (hide)

cpe:2.3:a:openwrt:luci:*:*:*:*:*:*:*:*
History

09 Jul 2026, 01:16

Type Values Removed Values Added
References
  • {'url': 'http://openwrt.com', 'tags': ['Vendor Advisory'], 'source': 'af854a3a-2127-422b-91ae-364da2661108'}
  • {'url': 'http://openwrtorg.com', 'tags': ['Broken Link'], 'source': 'af854a3a-2127-422b-91ae-364da2661108'}

05 Jul 2026, 17:17

Type Values Removed Values Added
Summary (en) The Web Interface for OpenWRT LuCI version 19.07 and lower has been discovered to have a cross-site scripting vulnerability which can lead to attackers carrying out arbitrary code execution. (en) The Web Interface for OpenWRT LuCI version 19.07 and lower has been discovered to have a cross-site scripting vulnerability.
References
  • () https://openwrt.org/advisory/start -
  • () https://openwrt.org/releases/19.07/start -

21 Nov 2024, 05:58

Type Values Removed Values Added
References () http://openwrt.com - Vendor Advisory () http://openwrt.com - Vendor Advisory
References () http://openwrtorg.com - Broken Link () http://openwrtorg.com - Broken Link
Information

Published : 2021-05-25 14:15

Updated : 2026-07-09 01:16

NVD link : CVE-2021-27821

Mitre link : CVE-2021-27821

CVE.ORG link : CVE-2021-27821

JSON object : View

Products Affected

openwrt

  • luci
CWE
CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')