CVE-2025-62877: Harvest May Expose OS Default SSH Login Password Via SUSE Virtualization Interactive Installer

Should you act?

Critical and remotely reachable

No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
• EPSS 0.5%, percentile 43: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 43% of all scored CVEs (low). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Only applies if your dependency tree includes github.com/harvester/harvester-installer (Go) >= 1.6.0, <= 1.6.1, no fixed version listed; github.com/harvester/harvester-installer (Go) >= 1.5.0, <= 1.5.2, no fixed version listed. Check your lockfile, including transitive dependencies.

What it is

Projects using the SUSE Virtualization (Harvester) environment may expose the OS default ssh login password if they are using the 1.5.x or 1.6.x interactive installer to either create a new cluster or add new hosts to an existing cluster. The environment is not affected if the PXE boot mechanism is utilized along with the Harvester configuration setup.

From the GitHub advisory

Impact

Projects using the SUSE Virtualization (Harvester) environment are vulnerable to this exploit if they are using the 1.5.x or 1.6.x interactive installer to either create a new cluster or add new hosts to an existing cluster. The environment is not affected if the PXE boot mechanism is utilized along with the Harvester configuration setup.

A critical vulnerability has been identified within the SUSE Virtualization interactive installer. This vulnerability allows an attacker to gain unauthorized network access to the host via a remote shell (SSH).

The SUSE Virtualization operating system includes a default administrative login credential intended solely for out-of-band cluster management tasks (for example, perform troubleshooting, device management and system recovery over serial ports). When the interactive installer is used to create or expand a cluster, the installer enables the host's networking functions before the default password is reset. This presents a window of opportunity for an attacker to exploit the default password to gain unauthorized access to the host via SSH.

Please consult the associated MITRE ATT&CK - Technique - Default Credentials for further information about this category of attack.

Weakness type: CWE-1188.

Product: github.com/harvester/harvester-installer (Go) · Assigned by: suse · Published: 2026-01-08

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Privileges required: none (no login)
• User interaction: none
• Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
• CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
• FIRST EPSS (model of 2026-10-21): 0.51% probability of exploitation activity in the next 30 days; percentile 43.

Timeline

• 2026-01-05 — GitHub-reviewed advisory GHSA-6g8q-hp2j-gvwv published (critical)
• 2026-01-08 — CVE record last updated
• 2026-01-08 — CVE record published by suse

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vulnerability records

1. GitHub Advisory GHSA-6g8q-hp2j-gvwv github.com
2. CVE.org record CVE-2025-62877 cve.org
3. NVD entry CVE-2025-62877 nvd.nist.gov

Other references from the CVE record and advisory

1. bugzilla.suse.com bugzilla.suse.com
2. github.com github.com

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