Is CVE-2025-56566 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2025-56566 being exploited in the wild.

How severe is CVE-2025-56566?

Medium severity, with a CVSS score of 4.6, published 16 September 2026.

Is there a fix for CVE-2025-56566?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2025-56566 attacked?

It is attacked with physical access, in device firmware.

Am I affected by CVE-2025-56566?

Check whether you run MikroTik RouterOS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2025-56566: MikroTik firmware cleartext credential storage

CVE-2025-56566 · Severity: medium · CVSS 4.6 · Published 2026-09-16

MikroTik routers running firmware 7.19.4 store administrative passwords, dynamic DNS credentials, and SMB user accounts in unencrypted form on the device's flash memory. An attacker with physical access to the hardware can extract this flash memory and recover all stored credentials and network information, compromising external services and enabling reconnaissance of the internal network—a critical risk for devices in unattended or physically unsecured locations.

Technologies: MikroTik RouterOS. Vendors: MikroTik.

Quick answers

Is CVE-2025-56566 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2025-56566 being exploited in the wild.
How severe is CVE-2025-56566?: Medium severity, with a CVSS score of 4.6, published 16 September 2026.
Which products and versions are affected?: MikroTik RouterOS 7.19.4.
Is there a fix for CVE-2025-56566?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2025-56566 attacked?: It is attacked with physical access, in device firmware.
Am I affected by CVE-2025-56566?: Check whether you run MikroTik RouterOS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

MikroTik firmware 7.19.4 stores sensitive configuration data—including administrative credentials, dynamic DNS passwords, SMB user accounts, and DHCP lease records—in cleartext within non-volatile SPI flash memory (CWE-312, CWE-316). The vulnerability requires physical access to the device and can be exploited by attaching a commodity SPI flash programmer (e.g., CH341A) to read the entire flash contents without authentication or powering the device. Extracted plaintext strings reveal credentials for external services, active network hosts and MAC addresses, and internal authentication accounts. An attacker can then use these credentials to compromise dependent services, map the internal network, and establish a foothold—extending the impact beyond the router itself to downstream systems and infrastructure.

Affected products

MikroTik RouterOS 7.19.4

Timeline

2025-07-28: disclosed: Vulnerability discovered
2025-08-01: disclosed: Technical validation completed
2025-08-02: disclosed: Vendor notified
2025-08-28: disclosed: CVE ID assigned by MITRE
2026-08-14: disclosed: Public disclosure

References

https://github.com/RIFTI-Offensive-Security/security-advisories/blob/main/CVE-2025-56566.md

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