Vulnerability-Lookup

CVE-2021-4129 (GCVE-0-2021-4129)

Vulnerability from cvelistv5 – Published: 2022-12-22 00:00 – Updated: 2025-04-16 15:56

Summary

Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 95, Firefox ESR < 91.4.0, and Thunderbird < 91.4.0.

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-16 15:56 UTC

CWE

Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4
CWE-787 - Out-of-bounds Write

Assigner

mozilla mitre root

References

4 references

URL	Tags
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1…

Impacted products

3 products

Vendor	Product	Version	CPE status
Mozilla	Firefox	Affected: unspecified , < 95 (custom)	guessed
Mozilla	Firefox ESR	Affected: unspecified , < 91.4.0 (custom)	guessed
Mozilla	Thunderbird	Affected: unspecified , < 91.4.0 (custom)	guessed

Show details on NVD website

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                  "baseSeverity": "CRITICAL",
                  "confidentialityImpact": "HIGH",
                  "integrityImpact": "HIGH",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-4129",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-04-16T15:56:25.351498Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-787",
                    "description": "CWE-787 Out-of-bounds Write",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-04-16T15:56:09.964Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "Firefox",
              "vendor": "Mozilla",
              "versions": [
                {
                  "lessThan": "95",
                  "status": "affected",
                  "version": "unspecified",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "Firefox ESR",
              "vendor": "Mozilla",
              "versions": [
                {
                  "lessThan": "91.4.0",
                  "status": "affected",
                  "version": "unspecified",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "Thunderbird",
              "vendor": "Mozilla",
              "versions": [
                {
                  "lessThan": "91.4.0",
                  "status": "affected",
                  "version": "unspecified",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox \u003c 95, Firefox ESR \u003c 91.4.0, and Thunderbird \u003c 91.4.0."
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "description": "Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4",
                  "lang": "en",
                  "type": "text"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2022-12-22T00:00:00.000Z",
            "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
            "shortName": "mozilla"
          },
          "references": [
            {
              "url": "https://www.mozilla.org/security/advisories/mfsa2021-53/"
            },
            {
              "url": "https://www.mozilla.org/security/advisories/mfsa2021-54/"
            },
            {
              "url": "https://www.mozilla.org/security/advisories/mfsa2021-52/"
            },
            {
              "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=1393362%2C1736046%2C1736751%2C1737009%2C1739372%2C1739421"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "assignerShortName": "mozilla",
        "cveId": "CVE-2021-4129",
        "datePublished": "2022-12-22T00:00:00.000Z",
        "dateReserved": "2021-12-16T00:00:00.000Z",
        "dateUpdated": "2025-04-16T15:56:28.819Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}

RHSA-2021_5046

Vulnerability from csaf_redhat - Published: 2021-12-09 12:58 - Updated: 2024-11-22 17:57

Summary

Red Hat Security Advisory: thunderbird security update

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2021-4129.

CVE-2021-4129

The Mozilla Foundation Security Advisory describes this flaw as: Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Thunderbird 91.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

9.8 (Critical)


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

Fixed: 15 products

https://access.redhat.com/errata/RHSA-2021:5046

Open the full advisory

RHSA-2021_5047

Vulnerability from csaf_redhat - Published: 2021-12-09 12:40 - Updated: 2024-11-22 17:58

Summary

Red Hat Security Advisory: thunderbird security update

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2021-4129.

CVE-2021-4129

9.8 (Critical)


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

Fixed: 10 products

https://access.redhat.com/errata/RHSA-2021:5047

Open the full advisory

RHSA-2021_5048

Vulnerability from csaf_redhat - Published: 2021-12-09 12:43 - Updated: 2024-11-22 17:58

Summary

Red Hat Security Advisory: thunderbird security update

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2021-4129.

CVE-2021-4129

9.8 (Critical)


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

Fixed: 13 products

https://access.redhat.com/errata/RHSA-2021:5048

Open the full advisory

RHSA-2021_5055

Vulnerability from csaf_redhat - Published: 2021-12-09 14:46 - Updated: 2024-11-22 17:58

Summary

Red Hat Security Advisory: thunderbird security update

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2021-4129.

CVE-2021-4129

9.8 (Critical)


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

Fixed: 7 products

https://access.redhat.com/errata/RHSA-2021:5055

Open the full advisory

UBUNTU-CVE-2021-4129 (CVE-2021-4129)

Vulnerability from osv_ubuntu – Published: 2022-01-21 00:00 – Updated: 2026-04-22 07:39 – Source website

Details

Severity

9.8 (Critical)


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

9.8 (Critical)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2021-4129	REPORT
	https://www.mozilla.org/en-US/security/advisories…	REPORT
	https://ubuntu.com/security/notices/USN-5246-1	ADVISORY
	https://ubuntu.com/security/notices/USN-5248-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-4129	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "thunderbird",
            "binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
          },
          {
            "binary_name": "thunderbird-gnome-support",
            "binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
          },
          {
            "binary_name": "thunderbird-mozsymbols",
            "binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
          },
          {
            "binary_name": "xul-ext-calendar-timezones",
            "binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
          },
          {
            "binary_name": "xul-ext-gdata-provider",
            "binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
          },
          {
            "binary_name": "xul-ext-lightning",
            "binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "thunderbird",
        "purl": "pkg:deb/ubuntu/thunderbird@1:91.5.0+build1-0ubuntu0.18.04.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:91.5.0+build1-0ubuntu0.18.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:52.4.0+build1-0ubuntu2",
        "1:52.6.0+build1-0ubuntu1",
        "1:52.7.0+build1-0ubuntu1",
        "1:52.8.0+build1-0ubuntu0.18.04.1",
        "1:52.9.1+build3-0ubuntu0.18.04.1",
        "1:60.2.1+build1-0ubuntu0.18.04.2",
        "1:60.4.0+build2-0ubuntu0.18.04.1",
        "1:60.5.1+build2-0ubuntu0.18.04.1",
        "1:60.6.1+build2-0ubuntu0.18.04.1",
        "1:60.7.0+build1-0ubuntu0.18.04.1",
        "1:60.7.1+build1-0ubuntu0.18.04.1",
        "1:60.7.2+build2-0ubuntu0.18.04.1",
        "1:60.8.0+build1-0ubuntu0.18.04.1",
        "1:60.9.0+build1-0ubuntu0.18.04.1",
        "1:68.2.1+build1-0ubuntu0.18.04.1",
        "1:68.2.2+build1-0ubuntu0.18.04.1",
        "1:68.4.1+build1-0ubuntu0.18.04.1",
        "1:68.7.0+build1-0ubuntu0.18.04.1",
        "1:68.8.0+build2-0ubuntu0.18.04.2",
        "1:68.10.0+build1-0ubuntu0.18.04.1",
        "1:78.8.1+build1-0ubuntu0.18.04.1",
        "1:78.11.0+build1-0ubuntu0.18.04.2",
        "1:78.13.0+build1-0ubuntu0.18.04.1",
        "1:78.14.0+build1-0ubuntu0.18.04.1",
        "1:78.14.0+build1-0ubuntu0.18.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "thunderbird",
            "binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
          },
          {
            "binary_name": "thunderbird-gnome-support",
            "binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
          },
          {
            "binary_name": "thunderbird-mozsymbols",
            "binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
          },
          {
            "binary_name": "xul-ext-calendar-timezones",
            "binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
          },
          {
            "binary_name": "xul-ext-gdata-provider",
            "binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
          },
          {
            "binary_name": "xul-ext-lightning",
            "binary_version": "1:91.5.0+build1-0ubuntu0.20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "thunderbird",
        "purl": "pkg:deb/ubuntu/thunderbird@1:91.5.0+build1-0ubuntu0.20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:91.5.0+build1-0ubuntu0.20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:68.1.2+build1-0ubuntu1",
        "1:68.1.2+build1-0ubuntu2",
        "1:68.2.1+build1-0ubuntu1",
        "1:68.2.2+build1-0ubuntu1",
        "1:68.3.0+build2-0ubuntu1",
        "1:68.3.1+build1-0ubuntu2",
        "1:68.4.1+build1-0ubuntu1",
        "1:68.4.2+build2-0ubuntu1",
        "1:68.5.0+build1-0ubuntu1",
        "1:68.6.0+build2-0ubuntu1",
        "1:68.7.0+build1-0ubuntu1",
        "1:68.7.0+build1-0ubuntu2",
        "1:68.8.0+build2-0ubuntu0.20.04.2",
        "1:68.10.0+build1-0ubuntu0.20.04.1",
        "1:78.7.1+build1-0ubuntu0.20.04.1",
        "1:78.8.1+build1-0ubuntu0.20.04.1",
        "1:78.11.0+build1-0ubuntu0.20.04.2",
        "1:78.13.0+build1-0ubuntu0.20.04.2",
        "1:78.14.0+build1-0ubuntu0.20.04.1",
        "1:78.14.0+build1-0ubuntu0.20.04.2"
      ]
    }
  ],
  "aliases": [],
  "details": "Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox \u003c 95, Firefox ESR \u003c 91.4.0, and Thunderbird \u003c 91.4.0.",
  "id": "UBUNTU-CVE-2021-4129",
  "modified": "2026-04-22T07:39:51Z",
  "published": "2022-01-21T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-4129"
    },
    {
      "type": "REPORT",
      "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-54/#CVE-2021-4129"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5246-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5248-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-4129"
    }
  ],
  "related": [
    "USN-5246-1",
    "USN-5248-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-4129"
  ]
}

WID-SEC-W-2023-0839

Vulnerability from csaf_certbund - Published: 2022-02-03 23:00 - Updated: 2025-10-06 22:00

Summary

Xerox FreeFlow Print Server: Mehrere Schwachstellen

Severity

Hoch

Scope

119 vulnerabilities in this advisory, including CVE-2021-4129.

CVE-2021-4129

Known affected: 2 products

Open the full advisory

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.

Related by attack behaviour

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

CVE-2021-4129 (GCVE-0-2021-4129)

RHSA-2021_5046

RHSA-2021_5047

RHSA-2021_5048

RHSA-2021_5055

UBUNTU-CVE-2021-4129 (CVE-2021-4129)

WID-SEC-W-2023-0839

Tags

Sightings

Nomenclature

Related by attack behaviour