What’s Vulnerable › Vulnerabilities

CVE-2017-17877

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-12-27 · updated 2026-06-17

Description

An issue was discovered in Valve Steam Link build 643. When the SSH daemon is enabled for local development, the device is publicly available via IPv6 TCP port 22 over the internet (with stateless address autoconfiguration) by default, which makes it easier for remote attackers to obtain access by guessing 24 bits of the MAC address and attempting a root login. This can be exploited in conjunction with CVE-2017-17878.

Affected products

• Valvesoftware Steam Link Firmware: before 644 — fixed in 644

How to fix

Upgrade to a fixed version: Valvesoftware Steam Link Firmware 644. Check the vendor advisory for mitigations.

References

• https://blogger.davidmanouchehri.com/2017/12/steam-link-security-remotely-insecure.html
• https://github.com/ValveSoftware/steamlink-sdk#ssh-access
• https://github.com/ValveSoftware/steamlink-sdk/issues/119
• https://blogger.davidmanouchehri.com/2017/12/steam-link-security-remotely-insecure.html
• https://github.com/ValveSoftware/steamlink-sdk#ssh-access
• https://github.com/ValveSoftware/steamlink-sdk/issues/119

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