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NVD / CVE Program· CNA redhat

CVE-2021-20208: A flaw was found in cifs-utils in versions before 6.13.

MediumCVSS 6.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.66% (FIRST EPSS); higher than 52.2% of all records.
  • Someone with local access to the system can trigger it. A low-privileged account is enough. A user must open a link or visit a page. Special conditions such as timing or configuration are required.
  • Fixed version: cifs-utils (Alpine:v3.10) 6.13-r0; cifs-utils (Debian:12) 2:6.11-3; cifs-utils (openSUSE:Leap 15.2) 6.9-lp152.2.3.1.

Low priority for now. Upgrade to cifs-utils (Alpine:v3.10) 6.13-r0; cifs-utils (Debian:12) 2:6.11-3; cifs-utils (openSUSE:Leap 15.2) 6.9-lp152.2.3.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Apr 19, 2021
Updated
Jun 16, 2026
EPSS
0.6% · 52th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
sambacifs-utils
redhatenterprise linux
fedoraprojectfedora

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a cifs-utils

    • cifs-utils 6.13affected
Affected versions · NVD (6)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fedoraproject fedora33
  • fedoraproject fedora34
  • fedoraproject fedora35
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • samba cifs-utils4.0 and later · before 6.13

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10cifs-utilsfrom 4.0 · before 6.13-r06.13-r0
Debian:12cifs-utilsbefore 2:6.11-32:6.11-3
openSUSE:Leap 15.2cifs-utilsbefore 6.9-lp152.2.3.16.9-lp152.2.3.1
openSUSE:Tumbleweedcifs-utilsbefore 6.13-1.36.13-1.3
SUSE:Linux Enterprise High Performance Computing 15-ESPOScifs-utilsbefore 6.9-3.14.16.9-3.14.1
SUSE:Linux Enterprise Module for Basesystem 15 SP2cifs-utilsbefore 6.9-5.9.16.9-5.9.1
SUSE:Linux Enterprise Software Development Kit 12 SP5cifs-utilsbefore 6.9-13.14.16.9-13.14.1

Same product

samba: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-27239In cifs-utils through 6.14, a stack-based buffer overflow when parsing the mount.cifs ip= command-line argument could lead to local…
    31Monitor
  • CVE-2020-14342It was found that cifs-utils' mount.cifs was invoking a shell when requesting the Samba password, which could be used to inject arbitrary…
    28Monitor
  • CVE-2022-29869cifs-utils through 6.14, with verbose logging, can cause an information leak when a file contains = (equal sign) characters but is not a…
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:cifs-utils6.13-r0 · Alpine:v3.10Package registry (OSV)
debian:cifs-utils2:6.11-3 · Debian:12Package registry (OSV)
opensuse:cifs-utils6.9-lp152.2.3.1 · openSUSE:Leap 15.2Package registry (OSV)
suse:cifs-utils6.9-13.14.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • A user must open a link or visit a page.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
low · data can be read
Integrity
high · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-266 · Incorrect Privilege Assignment

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records