CVE-2025-1020

Memory safety bugs present in Firefox 134 and Thunderbird 134. 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 < 135 and Thunderbird < 135.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1939063%2C1942169	Broken Link
https://www.mozilla.org/security/advisories/mfsa2025-07/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-11/	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mozilla:firefox:::::-:::*
	cpe:2.3:a:mozilla:thunderbird:::::-:::*

History

06 Feb 2025, 19:40

Type	Values Removed	Values Added
First Time		Mozilla Mozilla thunderbird Mozilla firefox
Summary		(es) Errores de seguridad de memoria presentes en Firefox 134 y Thunderbird 134. Algunos de estos errores mostraron evidencia de corrupción de memoria y suponemos que con suficiente esfuerzo algunos de ellos podrían haber sido explotados para ejecutar código arbitrario. Esta vulnerabilidad afecta a Firefox < 135 y Thunderbird < 135.
CPE		cpe:2.3:a:mozilla:thunderbird:::::-:::* cpe:2.3:a:mozilla:firefox:::::-:::*
References	~~() https://bugzilla.mozilla.org/buglist.cgi?bug_id=1939063%2C1942169 -~~	() https://bugzilla.mozilla.org/buglist.cgi?bug_id=1939063%2C1942169 - Broken Link
References	~~() https://www.mozilla.org/security/advisories/mfsa2025-07/ -~~	() https://www.mozilla.org/security/advisories/mfsa2025-07/ - Vendor Advisory
References	~~() https://www.mozilla.org/security/advisories/mfsa2025-11/ -~~	() https://www.mozilla.org/security/advisories/mfsa2025-11/ - Vendor Advisory
CWE		CWE-787
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.8

04 Feb 2025, 14:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-02-04 14:15

Updated : 2025-02-06 21:15

NVD link : CVE-2025-1020

Mitre link : CVE-2025-1020

CVE.ORG link : CVE-2025-1020

JSON object : View

Products Affected

mozilla

thunderbird
firefox

CWE

CWE-787

Out-of-bounds Write

{"id": "CVE-2025-1020", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "published": "2025-02-04T14:15:32.953", "references": [{"url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=1939063%2C1942169", "tags": ["Broken Link"], "source": "security@mozilla.org"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-07/", "tags": ["Vendor Advisory"], "source": "security@mozilla.org"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-11/", "tags": ["Vendor Advisory"], "source": "security@mozilla.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-787"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "Memory safety bugs present in Firefox 134 and Thunderbird 134. 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 < 135 and Thunderbird < 135."}, {"lang": "es", "value": "Errores de seguridad de memoria presentes en Firefox 134 y Thunderbird 134. Algunos de estos errores mostraron evidencia de corrupci\u00f3n de memoria y suponemos que con suficiente esfuerzo algunos de ellos podr\u00edan haber sido explotados para ejecutar c\u00f3digo arbitrario. Esta vulnerabilidad afecta a Firefox < 135 y Thunderbird < 135."}], "lastModified": "2025-02-06T21:15:22.943", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "C08017D5-BBC7-4E01-92D2-CE2E2ED9453A", "versionEndExcluding": "135.0"}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "B5DC3260-2056-4C30-BCBA-AD45537FF0F5", "versionEndExcluding": "135.0", "versionStartIncluding": "131.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@mozilla.org"}