6.3

CVE-2025-27093: bishopfox sliver Improper Access Control

CVSS: 6.3v3.1MediumDeferred
AliasesGHSA-q8j9-34qf-7vq7GO-2025-4079
Published 28-10-2025Last modified 29-10-2025
Open JSON

Vulnerability summary

CVE-2025-27093 is a medium (CVSS 6.3) Improper Access Control vulnerability in bishopfox sliver. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.1% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.29%
0%100%
Low · +0.07 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2025:15710-1OPENSUSE-SU-2026:21483-1

Timeline

  1. 28-10-2025
    PublishedVulnerability first disclosed.
  2. 29-10-2025
    Last modifiedVulnerability information updated.

Description

Sliver is a command and control framework that uses a custom Wireguard netstack. In versions 1.5.43 and earlier, and in development version 1.6.0-dev, the netstack does not limit traffic between Wireguard clients. This allows clients to communicate with each other unrestrictedly, potentially enabling leaked or recovered keypairs to be used to attack operators or allowing port forwardings to be accessible from other implants.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

+0.07 pp

From 0.22% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.29%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Bishopfox1 product
Github.com/BishopFox1 product
  • sliver< 1.5.44

2 vendors · 2 products

References

6 links