CVE-2025-0243

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{"affected": [{"affectedData": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "128.*", "status": "unaffected", "version": "128.6", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "134", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "128.*", "status": "unaffected", "version": "128.6", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "134", "versionType": "rpm"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "matchCriteriaId": "AEBB7F43-496D-4A67-8E9E-EEE29913B6DE", "versionEndExcluding": "128.6.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*", "matchCriteriaId": "F82571FC-4DDE-4C63-BD2B-8CF2FFEA28A8", "versionEndExcluding": "133.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "C92D62DE-A681-4B9D-9640-D12D04392A1B", "versionEndExcluding": "128.6.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "A633E231-80F8-4A92-BA69-B9BE5BE45D00", "versionEndExcluding": "134.0", "versionStartIncluding": "129.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. 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 was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6."}, {"lang": "es", "value": "Se han detectado errores de seguridad de memoria en Firefox 133, Thunderbird 133, Firefox ESR 128.5 y Thunderbird 128.5. Algunos de estos errores mostraban evidencia de corrupci\u00f3n de memoria y suponemos que, con el suficiente esfuerzo, algunos de ellos podr\u00edan haberse aprovechado para ejecutar c\u00f3digo arbitrario. Esta vulnerabilidad afecta a Firefox menor que 134 y Firefox ESR menor que 128.6."}], "id": "CVE-2025-0243", "lastModified": "2026-10-05T15:10:00.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 2.5, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-0243", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-01-08T16:44:56.236753Z", "version": "2.0.3"}}]}, "published": "2025-01-07T16:15:38.973", "references": [{"source": "security@mozilla.org", "tags": ["Broken Link", "Issue Tracking"], "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=1827142%2C1932783"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-01/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-02/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-04/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-05/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:0132", "cpe": "cpe:/o:redhat:rhel_els:7", "package": "firefox-0:128.6.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7 Extended Lifecycle Support", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0144", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:128.6.0-1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0281", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:128.6.0-3.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-01-13T00:00:00Z"}, {"advisory": "RHSA-2025:0133", "cpe": "cpe:/a:redhat:rhel_aus:8.2", "package": "firefox-0:128.6.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0286", "cpe": "cpe:/a:redhat:rhel_aus:8.2", "package": "thunderbird-0:128.6.0-3.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date": "2025-01-13T00:00:00Z"}, {"advisory": "RHSA-2025:0134", "cpe": "cpe:/a:redhat:rhel_aus:8.4", "package": "firefox-0:128.6.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0287", "cpe": "cpe:/a:redhat:rhel_aus:8.4", "package": "thunderbird-0:128.6.0-3.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2025-01-13T00:00:00Z"}, {"advisory": "RHSA-2025:0134", "cpe": "cpe:/a:redhat:rhel_tus:8.4", "package": "firefox-0:128.6.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0287", "cpe": "cpe:/a:redhat:rhel_tus:8.4", "package": "thunderbird-0:128.6.0-3.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2025-01-13T00:00:00Z"}, {"advisory": "RHSA-2025:0134", "cpe": "cpe:/a:redhat:rhel_e4s:8.4", "package": "firefox-0:128.6.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0287", "cpe": "cpe:/a:redhat:rhel_e4s:8.4", "package": "thunderbird-0:128.6.0-3.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2025-01-13T00:00:00Z"}, {"advisory": "RHSA-2025:0136", "cpe": "cpe:/a:redhat:rhel_aus:8.6", "package": "firefox-0:128.6.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0275", "cpe": "cpe:/a:redhat:rhel_aus:8.6", "package": "thunderbird-0:128.6.0-3.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2025-01-13T00:00:00Z"}, {"advisory": "RHSA-2025:0136", "cpe": "cpe:/a:redhat:rhel_tus:8.6", "package": "firefox-0:128.6.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0275", "cpe": "cpe:/a:redhat:rhel_tus:8.6", "package": "thunderbird-0:128.6.0-3.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2025-01-13T00:00:00Z"}, {"advisory": "RHSA-2025:0136", "cpe": "cpe:/a:redhat:rhel_e4s:8.6", "package": "firefox-0:128.6.0-1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0275", "cpe": "cpe:/a:redhat:rhel_e4s:8.6", "package": "thunderbird-0:128.6.0-3.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2025-01-13T00:00:00Z"}, {"advisory": "RHSA-2025:0137", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "firefox-0:128.6.0-1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0284", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "thunderbird-0:128.6.0-3.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2025-01-13T00:00:00Z"}, {"advisory": "RHSA-2025:0080", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "firefox-0:128.6.0-1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-01-08T00:00:00Z"}, {"advisory": "RHSA-2025:0147", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "thunderbird-0:128.6.0-3.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0162", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "firefox-0:128.6.0-1.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0165", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "thunderbird-0:128.6.0-3.el9_0", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0138", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "firefox-0:128.6.0-1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0167", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "thunderbird-0:128.6.0-3.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0135", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "firefox-0:128.6.0-1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-01-09T00:00:00Z"}, {"advisory": "RHSA-2025:0166", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "thunderbird-0:128.6.0-3.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-01-09T00:00:00Z"}], "bugzilla": {"description": "firefox: thunderbird: Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6", "id": "2336175", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2336175"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-120", "details": ["Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. 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 < 134, Firefox ESR < 128.6, Thunderbird < 134, and Thunderbird < 128.6.", "A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. 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."], "name": "CVE-2025-0243", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"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", "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/firefox", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird:flatpak/thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-01-07T16:07:07Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-0243\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-0243\nhttps://bugzilla.mozilla.org/buglist.cgi?bug_id=1827142%2C1932783\nhttps://www.mozilla.org/security/advisories/mfsa2025-01/\nhttps://www.mozilla.org/security/advisories/mfsa2025-02/"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-20T18:32:37.623316+00:00", "value": {"mitigation_remediation": ["Upgrade Mozilla Firefox to version 134 or later, including any ESR updates such as 128.6; ensure both web browser and mail client are at the latest patch level.", "On Red\u202fHat Enterprise Linux, apply the latest security updates for Firefox and Thunderbird via the package manager or repository to obtain the patched versions.", "For systems unable to upgrade immediately, disable or restrict the use of the affected Mozilla products until a patch is applied, and monitor for any report of exploitation in the wild."], "summary": {"action": "Patch Immediately", "impact": "Partial Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox versions 133 and any preceding releases, Mozilla Firefox ESR 128.5, Mozilla Thunderbird 133, and Mozilla Thunderbird ESR 128.5 are affected. The fixed versions are Firefox 134 and ESR 128.6, and Thunderbird 134 and ESR 128.6. The vulnerability also impacts systems that use these browsers on Red\u202fHat Enterprise Linux 8, 9, and associated extended support channels, as the CPE list indicates compatibility with those platforms.", "description_and_impact": "The vulnerability involves memory safety bugs that lead to memory corruption in the Firefox and Thunderbird web browser and mail client. Although the description notes that not all bugs were confirmed for exploitation, it is presumed that with sufficient effort some could allow arbitrary code execution. The weakness is rooted in improper memory handling, as indicated by the included CWE identifiers, and may compromise confidentiality, integrity, or availability of the affected system.", "risk_and_exploitability": "The CVSS score of 5.1 places the issue in the medium severity range. The EPSS score of less than 1% indicates that exploitation is currently unlikely, and the vulnerability is not listed in the CISA KEV catalog. The likely attack vector requires local or privileged access to trigger memory corruption, and the precise exploitation path would need a sufficient payload and conditions to influence the memory of the running browser or mail client."}}}}, "created": "2026-04-20T18:45:14.237858+00:00", "updated": "2026-04-20T18:45:14.237875+00:00", "vendors": []}