Vulnerability-Lookup

CVE-2025-6435 (GCVE-0-2025-6435)

Vulnerability from cvelistv5 – Published: 2025-06-24 12:28 – Updated: 2026-04-13 14:31

Title

Save as in Devtools could download files without sanitizing the extension

Summary

If a user saved a response from the Network tab in Devtools using the Save As context menu option, that file may not have been saved with the `.download` file extension. This could have led to the user inadvertently running a malicious executable. This vulnerability was fixed in Firefox 140 and Thunderbird 140.

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-24 13:37 UTC

CWE

CWE-434 - Unrestricted Upload of File with Dangerous Type

Assigner

mozilla mitre root

References

4 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1950056
https://bugzilla.mozilla.org/show_bug.cgi?id=1961777
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version	CPE status
Mozilla	Firefox	Unaffected: 140 , ≤ * (rpm)	guessed
Mozilla	Thunderbird	Unaffected: 140 , ≤ * (rpm)	guessed

Credits

Ameen Basha M K

Show details on NVD website

JSON

To clipboard

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            }
          ],
          "value": "If a user saved a response from the Network tab in Devtools using the Save As context menu option, that file may not have been saved with the `.download` file extension. This could have led to the user inadvertently running a malicious executable. This vulnerability was fixed in Firefox 140 and Thunderbird 140."
        }
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        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2025-51/"
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        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2025-54/"
        }
      ],
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    }
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    "redhat_vex": {
      "aggregate_severity": "Low",
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      "product_status:known_not_affected": "12",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "firefox: Save as in Devtools could download files without sanitizing the extension",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-6435.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-01T01:05:50Z",
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      "id": "CVE-2025-6435",
      "initial_release_date": "2025-06-24T23:24:31Z",
      "product_status:known_affected": "73",
      "product_status:recommended": "336",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-6435",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-6435.json",
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    },
    "vulnrichment": {
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}

OPENSUSE-SU-2025:15371-1

Vulnerability from csaf_opensuse - Published: 2025-07-23 00:00 - Updated: 2025-07-23 00:00

Summary

firefox-esr-140.1.0-1.1 on GA media

Severity

Moderate

Scope

22 vulnerabilities in this advisory, including CVE-2025-6435.

CVE-2025-6435

7.5 (High)


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

Recommended: 16 products

Open the full advisory

OPENSUSE-SU-2025:15383-1

Vulnerability from csaf_opensuse - Published: 2025-07-25 00:00 - Updated: 2025-07-25 00:00

Summary

MozillaThunderbird-140.1.0-1.1 on GA media

Severity

Moderate

Scope

20 vulnerabilities in this advisory, including CVE-2025-6435.

CVE-2025-6435

7.5 (High)


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

Recommended: 16 products

Open the full advisory

SUSE-SU-2025:02339-1

Vulnerability from csaf_suse - Published: 2025-07-17 08:52 - Updated: 2025-07-17 08:52

Summary

Security update for MozillaFirefox, MozillaFirefox-branding-SLE

Severity

Important

Scope

13 vulnerabilities in this advisory, including CVE-2025-6435.

CVE-2025-6435

7.5 (High)


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

Recommended: 17 products

Open the full advisory

SUSE-SU-2025:02529-1

Vulnerability from csaf_suse - Published: 2025-07-25 17:35 - Updated: 2025-07-25 17:35

Summary

Security update for MozillaFirefox, MozillaFirefox-branding-SLE

Severity

Important

Scope

27 vulnerabilities in this advisory, including CVE-2025-6435.

CVE-2025-6435

7.5 (High)


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

Recommended: 475 products

Open the full advisory

SUSE-SU-2025:02546-1

Vulnerability from csaf_suse - Published: 2025-07-30 07:34 - Updated: 2025-07-30 07:34

Summary

Security update for MozillaThunderbird

Severity

Important

Scope

25 vulnerabilities in this advisory, including CVE-2025-6435.

CVE-2025-6435

7.5 (High)


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

Recommended: 36 products

Open the full advisory

ubuntu-cve-2025-6435

Vulnerability from osv_ubuntu

Published

2025-06-24 13:15

Modified

2026-09-09 11:50

Summary

Details

If a user saved a response from the Network tab in Devtools using the Save As context menu option, that file may not have been saved with the .download file extension. This could have led to the user inadvertently running a malicious executable. This vulnerability affects Firefox < 140 and Thunderbird < 140.

Severity

8.1 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2025-6435	REPORT
	https://www.cve.org/CVERecord?id=CVE-2025-6435	REPORT
	https://www.mozilla.org/en-US/security/advisories…	REPORT
	https://bugzilla.mozilla.org/show_bug.cgi?id=1950056	REPORT
	https://bugzilla.mozilla.org/show_bug.cgi?id=1961777	REPORT
	https://www.mozilla.org/security/advisories/mfsa2…	REPORT
	https://ubuntu.com/security/notices/USN-7991-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-52-0",
            "binary_version": "52.9.1-0ubuntu0.18.04.1"
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      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "mozjs52",
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      },
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          "events": [
            {
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      ]
    },
    {
      "ecosystem_specific": {
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            "binary_name": "libmozjs-38-0",
            "binary_version": "38.8.0~repack1-0ubuntu4"
          }
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      },
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      ]
    },
    {
      "ecosystem_specific": {
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            "binary_name": "libmozjs-68-0",
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      "package": {
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    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
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          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
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      },
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          "events": [
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              "introduced": "0"
            }
          ],
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      ],
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    },
    {
      "ecosystem_specific": {
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            "binary_name": "libmozjs-102-0",
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "mozjs102",
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      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
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      ],
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        "102.13.0-0ubuntu0.22.04.1",
        "102.15.1-0ubuntu0.22.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-78-0",
            "binary_version": "78.15.0-4ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "mozjs78",
        "purl": "pkg:deb/ubuntu/mozjs78@78.15.0-4ubuntu1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
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          ],
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        }
      ],
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        "78.15.0-2",
        "78.15.0-4ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-91-0",
            "binary_version": "91.10.0-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "mozjs91",
        "purl": "pkg:deb/ubuntu/mozjs91@91.10.0-0ubuntu1?arch=source\u0026distro=jammy"
      },
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          "events": [
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              "introduced": "0"
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      ],
      "versions": [
        "91.5.1-0ubuntu1",
        "91.6.0-1",
        "91.6.0-2",
        "91.7.0-2",
        "91.10.0-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "thunderbird",
            "binary_version": "1:140.7.1+build1-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "thunderbird-gnome-support",
            "binary_version": "1:140.7.1+build1-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "thunderbird-mozsymbols",
            "binary_version": "1:140.7.1+build1-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "xul-ext-calendar-timezones",
            "binary_version": "1:140.7.1+build1-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "xul-ext-gdata-provider",
            "binary_version": "1:140.7.1+build1-0ubuntu0.22.04.1"
          },
          {
            "binary_name": "xul-ext-lightning",
            "binary_version": "1:140.7.1+build1-0ubuntu0.22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "thunderbird",
        "purl": "pkg:deb/ubuntu/thunderbird@1:140.7.1+build1-0ubuntu0.22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:140.7.1+build1-0ubuntu0.22.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:91.1.2+build1-0ubuntu1",
        "1:91.3.0+build2-0ubuntu1",
        "1:91.3.1+build1-0ubuntu1",
        "1:91.3.2+build1-0ubuntu1",
        "1:91.4.0+build1.1-0ubuntu1",
        "1:91.4.0+build2-0ubuntu1",
        "1:91.5.0+build1-0ubuntu1",
        "1:91.5.1+build1-0ubuntu1",
        "1:91.6.1+build1-0ubuntu1",
        "1:91.7.0+build1-0ubuntu1",
        "1:91.7.0+build2-0ubuntu1",
        "1:91.8.0+build2-0ubuntu1",
        "1:91.9.1+build1-0ubuntu0.22.04.1",
        "1:91.11.0+build2-0ubuntu0.22.04.1",
        "1:102.2.2+build1-0ubuntu0.22.04.1",
        "1:102.4.2+build2-0ubuntu0.22.04.1",
        "1:102.7.1+build2-0ubuntu0.22.04.1",
        "1:102.8.0+build2-0ubuntu0.22.04.1",
        "1:102.9.0+build1-0ubuntu0.22.04.1",
        "1:102.10.0+build2-0ubuntu0.22.04.1",
        "1:102.11.0+build1-0ubuntu0.22.04.1",
        "1:102.13.0+build1-0ubuntu0.22.04.1",
        "1:102.15.0+build1-0ubuntu0.22.04.1",
        "1:102.15.1+build1-0ubuntu0.22.04.1",
        "1:115.3.1+build1-0ubuntu0.22.04.2",
        "1:115.4.1+build1-0ubuntu0.22.04.1",
        "1:115.5.0+build1-0ubuntu0.22.04.1",
        "1:115.6.0+build2-0ubuntu0.22.04.1",
        "1:115.8.1+build1-0ubuntu0.22.04.1",
        "1:115.9.0+build1-0ubuntu0.22.04.1",
        "1:115.10.1+build1-0ubuntu0.22.04.1",
        "1:115.11.0+build2-0ubuntu0.22.04.1",
        "1:115.12.0+build3-0ubuntu0.22.04.1",
        "1:115.13.0+build5-0ubuntu0.22.04.1",
        "1:115.15.0+build1-0ubuntu0.22.04.1",
        "1:115.16.0+build2-0ubuntu0.22.04.1",
        "1:115.18.0+build1-0ubuntu0.22.04.1",
        "1:128.12.0+build1-0ubuntu0.22.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-102-0t64",
            "binary_version": "102.15.1-3ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "mozjs102",
        "purl": "pkg:deb/ubuntu/mozjs102@102.15.1-3ubuntu2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "102.15.1-1",
        "102.15.1-3ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmozjs-115-0t64",
            "binary_version": "115.10.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "mozjs115",
        "purl": "pkg:deb/ubuntu/mozjs115@115.10.0-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "115.3.0-0ubuntu1",
        "115.4.0-2",
        "115.5.0-1",
        "115.6.0-1",
        "115.7.0-4",
        "115.8.0-1",
        "115.9.0-1",
        "115.9.0-1build1",
        "115.10.0-1"
      ]
    }
  ],
  "aliases": [],
  "details": "If a user saved a response from the Network tab in Devtools using the Save As context menu option, that file may not have been saved with the `.download` file extension. This could have led to the user inadvertently running a malicious executable. This vulnerability affects Firefox \u003c 140 and Thunderbird \u003c 140.",
  "id": "UBUNTU-CVE-2025-6435",
  "modified": "2026-09-09T11:50:51Z",
  "published": "2025-06-24T13:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-6435"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-6435"
    },
    {
      "type": "REPORT",
      "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2025-51/#CVE-2025-6435"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1950056"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1961777"
    },
    {
      "type": "REPORT",
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-51/"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7991-1"
    }
  ],
  "related": [
    "USN-7991-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-6435"
  ]
}

WID-SEC-W-2025-1395

Vulnerability from csaf_certbund - Published: 2025-06-24 22:00 - Updated: 2026-06-11 22:00

Summary

Mozilla Firefox: Mehrere Schwachstellen

Severity

Hoch

Scope

13 vulnerabilities in this advisory, including CVE-2025-6435.

CVE-2025-6435

Known affected: 15 products

Open the full advisory

WID-SEC-W-2025-1850

Vulnerability from csaf_certbund - Published: 2025-08-14 22:00 - Updated: 2025-11-17 23:00

Summary

Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Severity

Mittel

Scope

181 vulnerabilities in this advisory, including CVE-2025-6435.

CVE-2025-6435

Known affected: 4 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-2025-6435 (GCVE-0-2025-6435)

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour