How severe is CVE-2017-17877?

CVE-2017-17877 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-17877 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-17877?

CVE-2017-17877 affects Valvesoftware Steam Link Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-17877?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2017-17877 published?

CVE-2017-17877 was published on 2017-12-27 and last updated on 2026-06-17.

CVE-2017-17877

CVE-2017-17877 is a critical-severity vulnerability in Valvesoftware Steam Link Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Valvesoftware Steam Link Firmware
Published: 2017-12-27
Last modified: 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.

Frequently asked questions

What is CVE-2017-17877?: 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.
How severe is CVE-2017-17877?: CVE-2017-17877 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-17877 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-17877?: CVE-2017-17877 affects Valvesoftware Steam Link Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-17877?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-17877 published?: CVE-2017-17877 was published on 2017-12-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:valvesoftware:steam_link_firmware:*:*:*:*:*:*:*:*