CVE-2025-56565

HighCVSS 7.6

Published: 16/09/2026(UTC)Updated: 22/09/2026(UTC)Translated: 17/09/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.13%

3th percentile - higher than 3% of all known CVEs

Summary

DD-WRT firmware deployed on TP-Link TL-WR740N v1 through v4 hardware stores sensitive authentication credentials in cleartext within non-volatile memory. Exposed material includes SSH private keys, dynamic DNS passwords, email notification credentials, and administrative passwords, which can be extracted from an SPI flash dump with physical access to the device.

Risk Assessment

Exposure of these credentials leads to device compromise, infiltration of the connected network, and unauthorized access to dependent third-party services. The risk is high for devices physically accessible to third parties.

Recommendation

Restrict physical access to the devices and consider replacing hardware with a model supporting secure credential storage. If physical access is suspected, rotate all exposed credentials, including SSH keys and third-party service passwords.

Other vulnerabilities in DD-WRT

CVE-2021-27137HighActively exploited
An issue was discovered in DD-WRT before version 45724 in router/upnp/src/ssdp.c. An unsafe strcpy in UPnP handling allows an unauthenticated remote attacker to overflow an internal fixed buffer via an M-SEARCH request. Exploitation requires UPnP to be enabled (disabled by default, listening only on internal interfaces).

Original NVD description (English source)

DD-WRT firmware, as deployed on TP-Link TL-WR740N v1 through v4 hardware, stores sensitive authentication credentials in cleartext within non-volatile memory. The exposed material includes SSH private keys, dynamic DNS passwords, email notification credentials and administrative passwords. An attacker with physical access to the device can extract these credentials from an SPI flash dump, leading to device compromise, infiltration of the connected network and unauthorised access to dependent third-party services.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS