CVE-2025-62820

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

Published: 2025-10-23 Last update: 2026-04-15 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-62820 is rated Low Risk (23.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.04%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-62820

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-21 0.05% 0.04% -0.01%
2 2025-12-30 0.04% 0.05% +0.02%
3 2025-10-23 — 0.04% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-62820

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 1.8 2.7 [email protected]

Weakness enumeration for CVE-2025-62820

GitHub Security Advisory for CVE-2025-62820

GHSA-x6fh-7qmf-69xh · Severity: medium · Ecosystem: go — Slack Nebula may accept arbitrary source IP addresses

OS Trackers for CVE-2025-62820

vendor priority summary link
alpine medium CVE-2025-62820: 1 source package rows (nebula); 19 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 19. https://security.alpinelinux.org/vuln/CVE-2025-62820

Affected software / configurations for CVE-2025-62820

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2025-62820

cvelogic Threat Intelligence