CVE-2025-62820CWE-420

CVE-2025-62820

Medium · published October 23, 2025

CVSS v3.1
4.9
EPSS
0%
Percentile
11.8
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
4.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00220 · 11.8th percentile
Weakness
CWE-420 · Unprotected Alternate Channel
Published
2025-10-23T08:18Z
References (2)
https://github.com/slackhq/nebula/pull/1493 · [email protected]https://github.com/slackhq/nebula/pull/1494 · [email protected]
EPSS history
Timeline
  • 23 OCT 00:00Z
    Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network
    cvelistv5