CVE-2020-11498

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-04-02 · updated 2026-06-17
Weakness: CWE-22

Description

Slack Nebula through 1.1.0 contains a relative path vulnerability that allows a low-privileged attacker to execute code in the context of the root user via tun_darwin.go or tun_windows.go. A user can also use Nebula to execute arbitrary code in the user's own context, e.g., for user-level persistence or to bypass security controls. NOTE: the vendor states that this "requires a high degree of access and other preconditions that are tough to achieve."

Affected products

slackhq nebula: through 1.1.0

References

http://www.pwn3d.org/posts/7918501-slack-nebula-relative-path-bug-bounty-disclosure
https://github.com/slackhq/nebula/pull/191
http://www.pwn3d.org/posts/7918501-slack-nebula-relative-path-bug-bounty-disclosure
https://github.com/slackhq/nebula/pull/191

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