How severe is CVE-2018-17153?

CVE-2018-17153 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2018-17153?

Affected package information for CVE-2018-17153 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2018-17153?

No fixed version has been published for CVE-2018-17153 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2018-17153 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2018-17153, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2018-17153?

CVE-2018-17153 has an EPSS (Exploit Prediction Scoring System) score of 92.0%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2018-17153?

CVE-2018-17153 is classified as Improper Authentication (CWE-287). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2018-17153?

CVE-2018-17153 affects western_digital my cloud dl2100; western_digital my cloud dl4100 firmware; western_digital my cloud ex2 firmware; western_digital my cloud ex2 ultra firmware, and 8 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2018-17153?

A Nuclei detection template exists for CVE-2018-17153, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2018-17153 published, and has it been updated?

CVE-2018-17153 was published on September 18, 2018 and was last updated on November 21, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2018-17153: My Cloud Dl2100 Improper Authentication (Critic…

EPSS Exploitation Probability

via FIRST.org ↗

92.0%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

It was discovered that the Western Digital My Cloud device before 2.30.196 is affected by an authentication bypass vulnerability. An unauthenticated attacker can exploit this vulnerability to authenticate as an admin user without needing to provide a password, thereby gaining full control of the device. (Whenever an admin logs into My Cloud, a server-side session is created that is bound to the user's IP address. After the session is created, it is possible to call authenticated CGI modules by sending the cookie username=admin in the HTTP request. The invoked CGI will check if a valid session is present and bound to the user's IP address.) It was found that it is possible for an unauthenticated attacker to create a valid session without a login. The network_mgr.cgi CGI module contains a command called "cgi_get_ipv6" that starts an admin session -- tied to the IP address of the user making the request -- if the additional parameter "flag" with the value "1" is provided. Subsequent invocation of commands that would normally require admin privileges now succeed if an attacker sets the username=admin cookie.

Affected Products

12 products · 12 configurations

OS

my cloud dl2100western_digital

< 2.30.196

range

OS

my cloud dl4100 firmwarewestern_digital

< 2.30.196

range

OS

my cloud ex2 firmwarewestern_digital

< 2.30.196

range

OS

my cloud ex2 ultra firmwarewestern_digital

< 2.30.196

range

OS

my cloud ex4 firmwarewestern_digital

< 2.30.196

range

OS

my cloud ex2100 firmwarewestern_digital

< 2.30.196

range

Frequently Asked Questions

It was discovered that the Western Digital My Cloud device before 2.30.196 is affected by an authentication bypass vulnerability. An unauthenticated attacker can exploit this vulnerability to authenticate as an admin user without needing to provide a password, thereby gaining full control of the device. (Whenever an admin logs into My Cloud, a server-side session is created that is bound to the user's IP address. After the session is created, it is possible to call authenticated CGI modules by sending the cookie username=admin in the HTTP request. The invoked CGI will check if a valid session

O3 Security · Impact-Aware SCA

Is CVE-2018-17153 in your stack?

O3 detects CVE-2018-17153 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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