What’s Vulnerable › Vulnerabilities

CVE-2025-62820

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-23 · updated 2026-10-08
• Weakness: CWE-420

Description

Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.

Affected products

• slackhq nebula: before 1.9.7 — fixed in 1.9.7

How to fix

Upgrade to a fixed version: slackhq nebula 1.9.7. Check the vendor advisory for mitigations.

References

• https://github.com/slackhq/nebula/pull/1493
• https://github.com/slackhq/nebula/pull/1494

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