CVE-2021-20208

What it is

A flaw was found in cifs-utils in versions before 6.13. A user when mounting a krb5 CIFS file system from within a container can use Kerberos credentials of the host. The highest threat from this vulnerability is to data confidentiality and integrity.

At a glance

Exploitability

Can be exploited locally on the machine with a low-privilege account, but needs a user to act. High risk of data tampering.

Exploit odds

0.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-04-19 22:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:33 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.7% in the next 30 days (EPSS).
• Severity: 6.1 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-04-19 22:15 UTC

Last modified

2026-06-17 03:33 UTC

Exploit probability

0.7% · EPSS, next 30 days

Weakness

CWE-266

Record status

Modified

Affected

• Samba cifs-utils < 6.13
• Redhat Enterprise Linux 7.0
• Redhat Enterprise Linux 8.0
• Fedoraproject Fedora 33
• Fedoraproject Fedora 34
• Fedoraproject Fedora 35

Attack profile CVSS 3.1 · 6.1

Attack vector

Local

Complexity

High

Privileges needed

Low

User interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-20208.md and follow it. Check whether this project is affected by CVE-2021-20208. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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