Slack Nebula up to 1.9.6 Source IP Address unprotected alternate channel

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Slack Nebula up to 1.9.6. This affects an unknown part of the component Source IP Address Handler. The manipulation leads to unprotected alternate channel. This vulnerability is traded as CVE-2025-62820. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Slack Nebula up to 1.9.6 and classified as problematic. This issue affects some unknown functionality of the component Source IP Address Handler. The manipulation with an unknown input leads to a unprotected alternate channel vulnerability. Using CWE to declare the problem leads to CWE-420. The product protects a primary channel, but it does not use the same level of protection for an alternate channel. Impacted is integrity, and availability. The summary by CVE is:

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

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-62820 since 10/23/2025. The exploitation is known to be difficult. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 1.9.7 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-202510-3274). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.2
VulDB Temp Score: 4.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.9
CNA Vector (MITRE): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Unprotected alternate channel
CWE: CWE-420 / CWE-419
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Nebula 1.9.7
Patch: github.com

Timelineinfo

10/23/2025 Advisory disclosed
10/23/2025 +0 days CVE reserved
10/23/2025 +0 days VulDB entry created
10/26/2025 +3 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2025-62820 (🔒)
GCVE (CVE): GCVE-0-2025-62820
GCVE (VulDB): GCVE-100-329639
CNNVD: CNNVD-202510-3274 - Slack Nebula 安全漏洞

Entryinfo

Created: 10/23/2025 06:53
Updated: 10/26/2025 15:30
Changes: 10/23/2025 06:53 (65), 10/25/2025 04:26 (6), 10/25/2025 19:48 (1), 10/26/2025 15:30 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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