Vulnerability-Lookup

CVE-2020-26966 (GCVE-0-2020-26966)

Vulnerability from cvelistv5 – Published: 2020-12-09 00:25 – Updated: 2024-08-04 16:03

Summary

Searching for a single word from the address bar caused an mDNS request to be sent on the local network searching for a hostname consisting of that string; resulting in an information leak. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

Severity

6.5 (Medium)


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

CWE

Single-word search queries were also broadcast to local network

Assigner

mozilla mitre root

References

4 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1663571	x_refsource_MISC
https://www.mozilla.org/security/advisories/mfsa2…	x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2…	x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2…	x_refsource_CONFIRM

Impacted products

3 products

Vendor	Product	Version	CPE status
Mozilla	Firefox	Affected: < 83	guessed
Mozilla	Firefox ESR	Affected: < 78.5	guessed
Mozilla	Thunderbird	Affected: < 78.5	guessed

Show details on NVD website

JSON

To clipboard

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    "redhat_vex": {
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      "cve": "CVE-2020-26966",
      "id": "CVE-2020-26966",
      "initial_release_date": "2020-11-17T00:00:00+00:00",
      "product_status:known_not_affected": "7",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Mozilla: Single-word search queries were also broadcast to local network",
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      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-01T01:42:56Z",
      "cve": "CVE-2020-26966",
      "id": "CVE-2020-26966",
      "initial_release_date": "2023-02-15T03:52:55Z",
      "product_status:known_affected": "60",
      "product_status:recommended": "397",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-26966",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-26966.json",
      "version": "23"
    }
  }
}

OPENSUSE-SU-2020:2315-1

Vulnerability from csaf_opensuse - Published: 2020-12-22 12:04 - Updated: 2020-12-22 12:04

Summary

Security update for MozillaFirefox

Severity

Important

Scope

12 vulnerabilities in this advisory, including CVE-2020-26966.

CVE-2020-26966

6.5 (Medium)


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

Recommended: 6 products

Open the full advisory

OPENSUSE-SU-2024:10600-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2024-06-15 00:00

Summary

MozillaFirefox-92.0-1.2 on GA media

Severity

Moderate

Scope

661 vulnerabilities in this advisory, including CVE-2020-26966.

CVE-2020-26966

6.5 (Medium)


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

Recommended: 20 products

Open the full advisory

OPENSUSE-SU-2024:10601-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2024-06-15 00:00

Summary

MozillaThunderbird-91.1.1-1.1 on GA media

Severity

Moderate

Scope

394 vulnerabilities in this advisory, including CVE-2020-26966.

CVE-2020-26966

6.5 (Medium)


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

Recommended: 12 products

Open the full advisory

OPENSUSE-SU-2024:14572-1

Vulnerability from csaf_opensuse - Published: 2024-12-12 00:00 - Updated: 2024-12-12 00:00

Summary

firefox-esr-128.5.1-1.1 on GA media

Severity

Moderate

Scope

1860 vulnerabilities in this advisory, including CVE-2020-26966.

CVE-2020-26966

6.5 (Medium)


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

Recommended: 16 products

Open the full advisory

SUSE-SU-2020:14548-1

Vulnerability from csaf_suse - Published: 2020-11-20 08:47 - Updated: 2020-11-20 08:47

Summary

Security update for MozillaFirefox

Severity

Important

Scope

12 vulnerabilities in this advisory, including CVE-2020-26966.

CVE-2020-26966

6.5 (Medium)


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

Recommended: 3 products

Open the full advisory

SUSE-SU-2020:3383-1

Vulnerability from csaf_suse - Published: 2020-11-19 10:16 - Updated: 2020-11-19 10:16

Summary

Security update for MozillaFirefox

Severity

Important

Scope

12 vulnerabilities in this advisory, including CVE-2020-26966.

CVE-2020-26966

6.5 (Medium)


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

Recommended: 16 products

Open the full advisory

SUSE-SU-2020:3458-1

Vulnerability from csaf_suse - Published: 2020-11-20 10:09 - Updated: 2020-11-20 10:09

Summary

Security update for MozillaFirefox

Severity

Important

Scope

12 vulnerabilities in this advisory, including CVE-2020-26966.

CVE-2020-26966

6.5 (Medium)


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

Recommended: 16 products

Open the full advisory

SUSE-SU-2020:3528-1

Vulnerability from csaf_suse - Published: 2020-11-26 10:52 - Updated: 2020-11-26 10:52

Summary

Security update for MozillaThunderbird

Severity

Important

Scope

12 vulnerabilities in this advisory, including CVE-2020-26966.

CVE-2020-26966

6.5 (Medium)


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

Recommended: 6 products

Open the full advisory

SUSE-SU-2020:3548-1

Vulnerability from csaf_suse - Published: 2020-11-27 11:18 - Updated: 2020-11-27 11:18

Summary

Security update for MozillaFirefox

Severity

Important

Scope

12 vulnerabilities in this advisory, including CVE-2020-26966.

CVE-2020-26966

6.5 (Medium)


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

Recommended: 112 products

Open the full advisory

ubuntu-cve-2020-26966

Vulnerability from osv_ubuntu

Published

2020-12-09 01:15

Modified

2026-04-22 07:39

Summary

Details

Searching for a single word from the address bar caused an mDNS request to be sent on the local network searching for a hostname consisting of that string; resulting in an information leak. Note: This issue only affected Windows operating systems. Other operating systems are unaffected.. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

Severity

6.5 (Medium)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2020-26966	REPORT
	https://www.mozilla.org/en-US/security/advisories…	REPORT
	https://www.cve.org/CVERecord?id=CVE-2020-26966	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-52-0",
            "binary_version": "52.9.1-0ubuntu0.18.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "mozjs52",
        "purl": "pkg:deb/ubuntu/mozjs52@52.9.1-0ubuntu0.18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "52.3.1-0ubuntu3",
        "52.3.1-7fakesync1",
        "52.8.1-0ubuntu0.18.04.1",
        "52.9.1-0ubuntu0.18.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-38-0",
            "binary_version": "38.8.0~repack1-0ubuntu4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "mozjs38",
        "purl": "pkg:deb/ubuntu/mozjs38@38.8.0~repack1-0ubuntu4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "38.8.0~repack1-0ubuntu1",
        "38.8.0~repack1-0ubuntu3",
        "38.8.0~repack1-0ubuntu4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-68-0",
            "binary_version": "68.6.0-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "mozjs68",
        "purl": "pkg:deb/ubuntu/mozjs68@68.6.0-1ubuntu1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "68.5.0-1~fakesync",
        "68.5.0-2~fakesync",
        "68.6.0-1",
        "68.6.0-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-52-0",
            "binary_version": "52.9.1-1ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "mozjs52",
        "purl": "pkg:deb/ubuntu/mozjs52@52.9.1-1ubuntu3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "52.9.1-1build1",
        "52.9.1-1ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "Searching for a single word from the address bar caused an mDNS request to be sent on the local network searching for a hostname consisting of that string; resulting in an information leak. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox \u003c 83, Firefox ESR \u003c 78.5, and Thunderbird \u003c 78.5.",
  "id": "UBUNTU-CVE-2020-26966",
  "modified": "2026-04-22T07:39:35Z",
  "published": "2020-12-09T01:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-26966"
    },
    {
      "type": "REPORT",
      "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2020-50/#CVE-2020-26966"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-26966"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-26966"
  ]
}

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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Action not permitted

CVE-2020-26966 (GCVE-0-2020-26966)

Vulnerability from osv_ubuntu

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