CVE-2025-5621: d-link dir-816 Command Injection

Vulnerability summary

CVE-2025-5621 is a critical (CVSS 9.8) Command Injection vulnerability in d-link dir-816. EPSS estimates a 7.47% chance of exploitation in the next 30 days, higher than 94.4% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 04-06-2025
   PublishedVulnerability first disclosed.
2. 05-06-2025
   Last modifiedVulnerability information updated.

Description

A vulnerability has been found in D-Link DIR-816 1.10CNB05 and classified as critical. Affected by this vulnerability is the function qosClassifier of the file /goform/qosClassifier. The manipulation of the argument dip_address/sip_address leads to os command injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

• CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.