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Fencer Vulns
medium 4.9

CVE-2025-0620 json

Samba: smbd doesn't pick up group membership changes when re-authenticating an expired smb session

published 2025-06-06 17 mo ago modified 2026-11-05 3 d ago also EUVD-2025-17307

cvss
4.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

A flaw was found in Samba. The smbd service daemon does not pick up group membership changes when re-authenticating an expired SMB session. This issue can expose file shares until clients disconnect and then connect again.

Patch / fix

  • samba samba 4.21.6, 4.22.2
  • samba Debian 14, Debian 13 2:4.22.2+dfsg-1

debian advisories DEBIAN-CVE-2025-0620

  • samba SLE Module for Basesystem 15 SP7, SLE High Availability Extension 15 SP7 4.21.6+git.402.80f493f530f-150700.3.3.1

suse advisories SUSE-SU-2025:02230-1

  • samba openSUSE Tumbleweed 4.22.2+git.396.c752843dcf4-1.1

opensuse advisories openSUSE-SU-2025:15296-1

  • samba Alpine 3.24, Alpine 3.23, Alpine 3.22 4.21.6-r0

alpine advisories ALPINE-CVE-2025-0620

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba Arch Linux 4.22.2-1

arch linux advisories AVG-2892

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-2025-0620 updated cvss 4.9

samba: smbd doesn't pick up group membership changes when re-authenticating an expired SMB session

  • Red Hat Enterprise Linux 9 ctdb, samba, libldb, ldb-tools, libnetapi, samba-libs, +27 more Red Hat Enterprise Linux 10 samba
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 6 samba, samba4, samba4-dc, samba-swat, samba4-libs, samba4-pidl, +17 more Red Hat Enterprise Linux 7 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +18 more Red Hat Enterprise Linux 8 ctdb, samba, libnetapi, ctdb-tests, samba-libs, samba-pidl, +24 more Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

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
partial
Assessed
7 mo ago

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-552 Files or Directories Accessible to External Parties

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.