CVE-2025-62820
Moderate
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.
Exploit probability
0.2%
Published
October 23, 2025
Required by
Not available
Last source change
August 12, 2026
02 / AFFECTED SOFTWARE
Affected packages
22 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
Open Source Vulnerabilities
CVE-2025-62820
View original source
Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.
Open Source Vulnerabilities
GO-2025-4068
View original source
Slack Nebula may accept arbitrary source IP addresses in github.com/slackhq/nebula
Open Source Vulnerabilities
GHSA-x6fh-7qmf-69xh
View original source
Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.
05 / REFERENCES
Further evidence
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/62xxx/CVE-2025-62820.json
- https://github.com/slackhq/nebula/pull/1493
- https://github.com/slackhq/nebula/pull/1494
- https://nvd.nist.gov/vuln/detail/CVE-2025-62820
- https://github.com/advisories/GHSA-x6fh-7qmf-69xh
- https://github.com/slackhq/nebula/commit/e264a0ff888c7bf0568579306755a60fc42f6ecc
- https://github.com/slackhq/nebula