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CVE-2023-28436

24
FAUCET Score

CVE-2023-28436 is a privilege escalation vulnerability in Tailscale SSH, affecting versions 1.34.0 through 1.38.1 on FreeBSD systems. It allows commands to execute with a higher privilege group ID than intended due to a discrepancy in how the FreeBSD setgroups system call handles group restrictions. This vulnerability carries a high CVSS score of 8.0, indicating a significant impact on confidentiality, integrity, and availability, with a low attack complexity and requiring low privileges. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.34, < 1.38.2CPE matchmatch criteria
cpe:2.3:a:tailscale:tailscale:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.7MEDIUM

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.2
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.46%
Probability of exploitation in next 30 days
EPSS Percentile
37.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0046 is in the 28th percentile among its peer group of 554 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: tailscale.comFixed in: 1.38.2

Vendor Advisories (1)

goGHSA-vfgq-g5x8-g595medium

Non-interactive Tailscale SSH sessions on FreeBSD may use the effective group ID of the tailscaled process

Mar 23, 2023

References

github.com / tailscale/tailscale/commit/d00c046b723dff6e3775d7d35f891403ac21a47d
Patch
github.com / tailscale/tailscale/releases/tag/v1.38.2
PatchRelease Notes
github.com / tailscale/tailscale/security/advisories/GHSA-vfgq-g5x8-g595
MitigationVendor Advisory
tailscale.com / security-bulletins
Vendor Advisory