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CVE-2025-0620VulnerabilityPublished Updated

Bundesamt für Sicherheit in der Informationstechnik Fedora · Samba: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Affects Bundesamt für Sicherheit in der Informationstechnik FedoraSource GCVE Database

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Authoritative record:CVE-2025-0620· Medium 4.9

Not known to be exploited · CVSS 4.9 Medium : upgrade Fedora samba to 4.21.6 when convenient.

Data as of 13 Nov 2026, 19:46 UTC

CVSS 3.1 base score
4.9Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.14.9
Patch
Available – fixed in 4.21.6
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Jun 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade samba to 4.21.6.

Affected software

ProductAffectedFixed in
sambaAffected
  • >=4.21.0 <4.21.6
Fixed in
  • 4.21.6
Red Hatredhat/sambapkg:rpm/redhat/sambaOther threatsAffected
  • =4.21.0
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

The vendor has released a fixed package version (2:4.21.4+dfsg-1ubuntu3.1) for Ubuntu 25.04. Applying this update will remediate the vulnerability. Users should perform a standard system update to receive the fix. No additional mitigation steps are indicated by the vendor advisory.

Description

A vulnerability in Samba allows a remote user to bypass security controls related to group membership changes when using Kerberos authentication. This flaw could enable a user to retain access to network resources even after being removed by an administrator. The issue affects Samba versions prior to the fixed release and is addressed by updating to the patched package version provided by Ubuntu.

References

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