CVE-2020-11498

Name: CVE-2020-11498
Creator: NVD / NIST
Published: 2020-04-02T23:15:13.033+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.40%

Last modified Jun 17, 2026

CVE-2020-11498 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 3.40% chance of exploitation in the next 30 days.

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."

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.40%

87.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Slack	Nebula	<= 1.1.0

References

http://www.pwn3d.org/posts/7918501-slack-nebula-relative-path-bug-bounty-disclosureExploit, Third Party Advisory
https://github.com/slackhq/nebula/pull/191Patch, Third Party Advisory
http://www.pwn3d.org/posts/7918501-slack-nebula-relative-path-bug-bounty-disclosureExploit, Third Party Advisory
https://github.com/slackhq/nebula/pull/191Patch, Third Party Advisory

Timeline

Published: Apr 2, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-11498?

How severe is CVE-2020-11498?

CVE-2020-11498 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.40% probability of exploitation in the next 30 days.

How do I fix CVE-2020-11498?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-11498?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST