CVE-2025-4093

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-4093", "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "state": "PUBLISHED", "assignerShortName": "mozilla", "dateReserved": "2025-04-29T13:13:50.246Z", "datePublished": "2025-04-29T13:13:50.917Z", "dateUpdated": "2026-04-13T14:27:25.816Z"}, "containers": {"cna": {"affected": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "128.10", "lessThanOrEqual": "*", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"status": "unaffected", "version": "128.10", "lessThanOrEqual": "*", "versionType": "rpm"}]}], "descriptions": [{"lang": "en", "value": "Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.10 and Thunderbird 128.10.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.10 and Thunderbird 128.10."}]}], "title": "Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10", "references": [{"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1894100", "name": "Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-29/"}, {"url": "https://www.mozilla.org/security/advisories/mfsa2025-32/"}], "credits": [{"lang": "en", "value": "Andrew McCreight"}], "providerMetadata": {"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla", "dateUpdated": "2026-04-13T14:27:25.816Z"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-119", "lang": "en", "description": "CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2025-04-29T15:16:24.376458Z", "id": "CVE-2025-4093", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-09-22T17:45:06.758Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:58:54.629Z"}}]}}

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{"affected": [{"affectedData": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "*", "status": "unaffected", "version": "128.10", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "*", "status": "unaffected", "version": "128.10", "versionType": "rpm"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "matchCriteriaId": "3378E5EE-9ABF-444B-AA88-9EAF8D8058DE", "versionEndExcluding": "128.10", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*", "matchCriteriaId": "DC19822B-CC07-4C6F-BAAD-C7A9C4E73FA9", "versionEndExcluding": "128.10.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 128.10 and Thunderbird 128.10."}, {"lang": "es", "value": "Error de seguridad de memoria presente en Firefox ESR 128.9 y Thunderbird 128.9. Este error mostr\u00f3 evidencia de corrupci\u00f3n de memoria y presumimos que, con suficiente esfuerzo, podr\u00eda haberse explotado para ejecutar c\u00f3digo arbitrario. Esta vulnerabilidad afecta a Firefox ESR menor que 128.10 y Thunderbird ESR menor que 128.10."}], "id": "CVE-2025-4093", "lastModified": "2026-10-05T15:10:00.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-4093", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-04-29T15:16:24.376458Z", "version": "2.0.3"}}]}, "published": "2025-04-29T14:15:35.907", "references": [{"source": "security@mozilla.org", "tags": ["Permissions Required"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1894100"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-29/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-32/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:7506", "cpe": "cpe:/o:redhat:enterprise_linux:10.0", "package": "firefox-0:128.10.0-1.el10_0", "product_name": "Red Hat Enterprise Linux 10", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:7507", "cpe": "cpe:/o:redhat:enterprise_linux:10.0", "package": "thunderbird-0:128.10.0-1.el10_0", "product_name": "Red Hat Enterprise Linux 10", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:4751", "cpe": "cpe:/o:redhat:rhel_els:7", "package": "firefox-0:128.10.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7 Extended Lifecycle Support", "release_date": "2025-05-08T00:00:00Z"}, {"advisory": "RHSA-2025:4458", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:128.10.0-1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-05-05T00:00:00Z"}, {"advisory": "RHSA-2025:4797", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:128.10.0-1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-05-12T00:00:00Z"}, {"advisory": "RHSA-2025:7547", "cpe": "cpe:/a:redhat:rhel_aus:8.2", "package": "firefox-0:128.10.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date": "2025-05-14T00:00:00Z"}, {"advisory": "RHSA-2025:7693", "cpe": "cpe:/a:redhat:rhel_aus:8.2", "package": "thunderbird-0:128.10.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date": "2025-05-15T00:00:00Z"}, {"advisory": "RHSA-2025:7545", "cpe": "cpe:/a:redhat:rhel_aus:8.4", "package": "firefox-0:128.10.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2025-05-14T00:00:00Z"}, {"advisory": "RHSA-2025:7691", "cpe": "cpe:/a:redhat:rhel_aus:8.4", "package": "thunderbird-0:128.10.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2025-05-15T00:00:00Z"}, {"advisory": "RHSA-2025:7545", "cpe": "cpe:/a:redhat:rhel_tus:8.4", "package": "firefox-0:128.10.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2025-05-14T00:00:00Z"}, {"advisory": "RHSA-2025:7691", "cpe": "cpe:/a:redhat:rhel_tus:8.4", "package": "thunderbird-0:128.10.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2025-05-15T00:00:00Z"}, {"advisory": "RHSA-2025:7545", "cpe": "cpe:/a:redhat:rhel_e4s:8.4", "package": "firefox-0:128.10.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2025-05-14T00:00:00Z"}, {"advisory": "RHSA-2025:7691", "cpe": "cpe:/a:redhat:rhel_e4s:8.4", "package": "thunderbird-0:128.10.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2025-05-15T00:00:00Z"}, {"advisory": "RHSA-2025:7544", "cpe": "cpe:/a:redhat:rhel_aus:8.6", "package": "firefox-0:128.10.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2025-05-14T00:00:00Z"}, {"advisory": "RHSA-2025:7690", "cpe": "cpe:/a:redhat:rhel_aus:8.6", "package": "thunderbird-0:128.10.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2025-05-15T00:00:00Z"}, {"advisory": "RHSA-2025:7544", "cpe": "cpe:/a:redhat:rhel_tus:8.6", "package": "firefox-0:128.10.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2025-05-14T00:00:00Z"}, {"advisory": "RHSA-2025:7690", "cpe": "cpe:/a:redhat:rhel_tus:8.6", "package": "thunderbird-0:128.10.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2025-05-15T00:00:00Z"}, {"advisory": "RHSA-2025:7544", "cpe": "cpe:/a:redhat:rhel_e4s:8.6", "package": "firefox-0:128.10.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2025-05-14T00:00:00Z"}, {"advisory": "RHSA-2025:7690", "cpe": "cpe:/a:redhat:rhel_e4s:8.6", "package": "thunderbird-0:128.10.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2025-05-15T00:00:00Z"}, {"advisory": "RHSA-2025:7543", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "firefox-0:128.10.0-1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2025-05-14T00:00:00Z"}, {"advisory": "RHSA-2025:7689", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "thunderbird-0:128.10.0-1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2025-05-15T00:00:00Z"}, {"advisory": "RHSA-2025:4443", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "firefox-0:128.10.0-1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-05T00:00:00Z"}, {"advisory": "RHSA-2025:4460", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "thunderbird-0:128.10.0-1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-05T00:00:00Z"}, {"advisory": "RHSA-2025:7428", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "firefox-0:128.10.0-1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:4753", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "firefox-0:128.10.0-1.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2025-05-08T00:00:00Z"}, {"advisory": "RHSA-2025:7692", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "thunderbird-0:128.10.0-1.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2025-05-15T00:00:00Z"}, {"advisory": "RHSA-2025:4752", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "firefox-0:128.10.0-1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2025-05-08T00:00:00Z"}, {"advisory": "RHSA-2025:7694", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "thunderbird-0:128.10.0-1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2025-05-15T00:00:00Z"}, {"advisory": "RHSA-2025:4756", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "firefox-0:128.10.0-1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-05-08T00:00:00Z"}, {"advisory": "RHSA-2025:7695", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "thunderbird-0:128.10.0-1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-05-15T00:00:00Z"}], "bugzilla": {"description": "firefox: thunderbird: Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10", "id": "2362915", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2362915"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-120", "details": ["Memory safety bug present in Firefox ESR 128.9, and Thunderbird 128.9. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 128.10 and Thunderbird < 128.10."], "name": "CVE-2025-4093", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox-flatpak-container", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "thunderbird-flatpak-container", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox-flatpak-container", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird-flatpak-container", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-04-29T13:13:50Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-4093\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-4093\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=1894100\nhttps://www.mozilla.org/security/advisories/mfsa2025-29/\nhttps://www.mozilla.org/security/advisories/mfsa2025-32/"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-20T17:11:01.030307+00:00", "value": {"mitigation_remediation": ["Upgrade Firefox ESR to 128.10 or a later version, and upgrade Thunderbird ESR to 128.10 or later, which contain the patch for this memory safety bug.", "Enable automatic updates for Firefox ESR and Thunderbird ESR so that future security fixes are applied without user intervention.", "If an immediate upgrade is not feasible, limit the use of these browsers for potentially untrusted content, disable native plugins or features that execute native code, and monitor for anomalous activity that could indicate exploitation attempts."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution via memory corruption"}, "threat_synthesis": {"affected_systems": "Affected products are Mozilla Firefox ESR and Thunderbird ESR. All releases prior to 128.10 are impacted, including 128.9. The bug is relevant to installations on systems identified by the supplied CPE strings, such as Red\u00a0Hat Enterprise Linux 8 and 9 and their extended support variants.", "description_and_impact": "The vulnerability is a memory safety bug that existed in Firefox ESR 128.9 and Thunderbird 128.9, causing memory corruption that could be leveraged to run arbitrary code. It represents a buffer overflow and classic buffer overrun weakness (CWE-119, CWE-120) and has a CVSS score of 8.1, indicating high severity.", "risk_and_exploitability": "The EPSS score is less than 1%, indicating a low current exploitation probability, and the vulnerability is not listed in CISA\u2019s KEV catalog. The most likely attack path is remote, involving malicious content rendered by the browser\u2014such as a crafted web page or a deceptive email\u2014to trigger the memory corruption and potentially execute arbitrary code. No public exploit is known, but the high CVSS score warrants proactive mitigation."}}}}, "created": "2026-04-20T17:15:12.551258+00:00", "updated": "2026-04-20T17:15:12.551278+00:00", "vendors": []}