CVE-2021-33516
gupnp: allows DNS rebinding which could result in tricking browser into triggering actions against local UPnP services
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · May 24, 2021
Updated · November 22, 2025
Description
A flaw was found in gupnp. DNS rebinding can occur when a victim's browser is used by a remote web server to trigger actions against local UPnP services including data exfiltration, data tempering, and other exploits. The highest threat from this vulnerability is to data confidentiality and integrity.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.
CVSS / CWE
CVSS 3.1 · 8.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor