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Fencer Vulns
medium 6.4

CVE-2025-57849 json

Fuse: privilege escalation via excessive /etc/passwd permissions

published 2026-03-13 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-208627

cvss
6.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

A container privilege escalation flaw was found in certain Fuse images. This issue stems from the /etc/passwd file being created with group-writable permissions during build time. In certain conditions, an attacker who can execute commands within an affected container, even as a non-root user, can leverage their membership in the root group to modify the /etc/passwd file. This could allow the attacker to add a new user with any arbitrary UID, including UID 0, leading to full root privileges within the container.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-57849 updated cvss 6.4

fuse: privilege escalation via excessive /etc/passwd permissions

  • Red Hat Fuse 7 fuse7/fuse-java-openshift-rhel8 fuse7/fuse-java-openshift-rhel8, fuse7/fuse-karaf-openshift-rhel8 fuse7/fuse-karaf-openshift-rhel8, fuse7/fuse-java-openshift-jdk11-rhel8 fuse7/fuse-java-openshift-jdk11-rhel8, fuse7/fuse-java-openshift-jdk17-rhel8 fuse7/fuse-java-openshift-jdk17-rhel8, fuse7/fuse-karaf-openshift-jdk11-rhel8 fuse7/fuse-karaf-openshift-jdk11-rhel8, fuse7/fuse-karaf-openshift-jdk17-rhel8 fuse7/fuse-karaf-openshift-jdk17-rhel8
    affected: no fix planned “Out of support scope”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
7 mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.4 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 6.4 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Fuse 7

Classification

Weakness
  • CWE-276 Incorrect Default Permissions

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.