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CVE-2025-62820

Good to know:

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Date: October 22, 2025

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

Severity Score

Related Resources (6)

https://nvd.nist.gov/vuln/detail/CVE-2025-62820
https://github.com/slackhq/nebula/pull/1493
https://github.com/slackhq/nebula/commit/e264a0ff888c7bf0568579306755a60fc42f6ecc
https://github.com/slackhq/nebula
https://github.com/slackhq/nebula/pull/1494
https://www.mend.io/vulnerability-database/CVE-2025-62820

Severity Score

Weakness Type (CWE)

Unprotected Alternate Channel

CWE-420

Top Fix

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Upgrade Version

Upgrade to version github.com/slackhq/nebula - v1.9.7;github.com/slackhq/nebula - v1.9.7

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): LOW

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