CVE-2025-62820 — MEDIUM (4.9)

Vulnerability Description

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

CVSS Score

4.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

NONE

Integrity

LOW

Availability

LOW

Related Weaknesses (CWE)

CWE-420

References

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

FAQ

What is CVE-2025-62820?

CVE-2025-62820 is a vulnerability with a CVSS score of 4.9 (MEDIUM). Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.

How severe is CVE-2025-62820?

CVE-2025-62820 has been rated MEDIUM with a CVSS base score of 4.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-62820?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.