Vulnerability-Lookup

OESA-2021-1193 (CVE-2021-20208)

Vulnerability from osv_openeuler – Published: 2021-05-24 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

cifs-utils security update

Details

The in-kernel CIFS filesystem is generally the preferred method for mounting SMB/CIFS shares on Linux.

Security Fix(es):

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.(CVE-2021-20208)

Severity

6.1 (Medium)


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

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-20208	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "cifs-utils-devel-6.10-2.oe1.aarch64.rpm",
          "cifs-utils-debuginfo-6.10-2.oe1.aarch64.rpm",
          "cifs-utils-debugsource-6.10-2.oe1.aarch64.rpm",
          "cifs-utils-help-6.10-2.oe1.aarch64.rpm",
          "cifs-utils-6.10-2.oe1.aarch64.rpm"
        ],
        "src": [
          "cifs-utils-6.10-2.oe1.src.rpm"
        ],
        "x86_64": [
          "cifs-utils-debugsource-6.10-2.oe1.x86_64.rpm",
          "cifs-utils-devel-6.10-2.oe1.x86_64.rpm",
          "cifs-utils-help-6.10-2.oe1.x86_64.rpm",
          "cifs-utils-6.10-2.oe1.x86_64.rpm",
          "cifs-utils-debuginfo-6.10-2.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "cifs-utils",
        "purl": "pkg:rpm/openEuler/cifs-utils\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.10-2.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "The in-kernel CIFS filesystem is generally the preferred method for mounting SMB/CIFS shares on Linux.\r\n\r\nSecurity Fix(es):\r\n\r\nA 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.(CVE-2021-20208)",
  "id": "OESA-2021-1193",
  "modified": "2026-08-06T11:04:26Z",
  "published": "2021-05-24T11:04:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1193"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20208"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "cifs-utils security update",
  "upstream": [
    "CVE-2021-20208"
  ]
}

CVE-2021-20208 (GCVE-0-2021-20208)

Vulnerability from cvelistv5 – Published: 2021-04-19 21:12 – Updated: 2024-08-03 17:30

Summary

Severity

No CVSS data available.

CWE

CWE-266

Assigner

redhat redhat root

References

5 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1921116	x_refsource_MISC
https://bugzilla.samba.org/show_bug.cgi?id=14651	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

Impacted products

1 product

Vendor	Product	Version
n/a	cifs-utils	Affected: cifs-utils 6.13

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2021-1193 (CVE-2021-20208)

CVE-2021-20208 (GCVE-0-2021-20208)

Tags

Sightings

Nomenclature

Related by attack behaviour