CVE-2025-8036

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{"affected": [{"affectedData": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "140.*", "status": "unaffected", "version": "140.1", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "141", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "140.*", "status": "unaffected", "version": "140.1", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "141", "versionType": "rpm"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "matchCriteriaId": "B4D5C090-29D0-4488-843B-6CAAA287CF91", "versionEndExcluding": "140.1.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*", "matchCriteriaId": "8684A46E-D70A-4830-8971-A6DCC360F422", "versionEndExcluding": "141.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*", "matchCriteriaId": "F6B4AF14-07DC-4941-9531-9CFC6CE00567", "versionEndExcluding": "140.1.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*", "matchCriteriaId": "95D506DD-BD9B-4D90-802F-5BE673F1CF14", "versionEndExcluding": "141.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Thunderbird cached CORS preflight responses across IP address changes. This allowed circumventing CORS with DNS rebinding. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1."}, {"lang": "es", "value": "Thunderbird almacen\u00f3 en cach\u00e9 las respuestas de preflight de CORS tras los cambios de direcci\u00f3n IP. Esto permiti\u00f3 eludir CORS mediante revinculaci\u00f3n de DNS. Esta vulnerabilidad afecta a Firefox menor que 141, Firefox ESR menor que 140.1, Thunderbird menor que 141 y Thunderbird menor que 140.1."}], "id": "CVE-2025-8036", "lastModified": "2026-10-05T15:10:00.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-8036", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-07-23T14:26:17.781838Z", "version": "2.0.3"}}]}, "published": "2025-07-22T21:15:50.760", "references": [{"source": "security@mozilla.org", "tags": ["Permissions Required"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1960834"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-56/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-59/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-61/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-63/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.kb.cert.org/vuls/id/652514"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-350"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "firefox: thunderbird: DNS rebinding circumvents CORS", "id": "2382716", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2382716"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-350", "details": ["Thunderbird cached CORS preflight responses across IP address changes. This allowed circumventing CORS with DNS rebinding. This vulnerability affects Firefox < 141, Firefox ESR < 140.1, Thunderbird < 141, and Thunderbird < 140.1.", "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nFirefox caches CORS preflight responses across IP address changes. This allows circumventing CORS with DNS rebinding."], "name": "CVE-2025-8036", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "rhel10/firefox-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "rhel10/thunderbird-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-22T20:49:25Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-8036\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-8036\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=1960834\nhttps://www.mozilla.org/security/advisories/mfsa2025-56/\nhttps://www.mozilla.org/security/advisories/mfsa2025-59/\nhttps://www.mozilla.org/security/advisories/mfsa2025-61/\nhttps://www.mozilla.org/security/advisories/mfsa2025-63/"], "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": "2026-04-20T22:10:29.094491+00:00", "value": {"mitigation_remediation": ["Upgrade to Firefox\u00a0141 or later, or Firefox\u00a0ESR\u00a0140.1, and to Thunderbird\u00a0141 or\u00a0140.1 to apply the vendor fix.", "If an immediate upgrade is not possible, configure the browser or runtime environment to prevent caching of CORS preflight responses when the host changes, if such a configuration option is available.", "Strengthen DNS policies by applying DNS rebinding protection on network devices, proxies, or firewalls to reduce the ability of attackers to switch a domain\u2019s IP address during a session."], "summary": {"action": "Apply Patch", "impact": "CORS bypass via DNS rebinding"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox and Thunderbird, all standard and ESR releases prior to Firefox 141 (including ESR versions below 140.1) and Thunderbird prior to 141 (including ESR versions below 140.1) are affected. The fix is available in Firefox 141 and ESR 140.1 and Thunderbird 141 and ESR 140.1.", "description_and_impact": "The vulnerability enables malicious sites to conduct DNS rebinding, causing the browser to cache CORS preflight responses across IP address changes. This caching allows the site to send cross\u2011origin requests that would normally be blocked by the browser\u2019s CORS policy. The consequence is that the attacker can access resources or perform actions on a target origin that the origin intends to protect through CORS, potentially exposing data or functionality meant to be restricted to its own domain.", "risk_and_exploitability": "The CVSS score of 8.1 indicates a high severity vulnerability, but the EPSS score of less than 1% suggests a very low likelihood of exploitation in the wild. The vulnerability is not listed in the CISA KEV catalog. Attackers would need to lure a user to a malicious origin capable of performing DNS rebinding; thus the risk primarily concerns phishing or compromised DNS infrastructure scenarios."}}}}, "created": "2025-07-23T17:36:01.818679+00:00", "updated": "2026-04-20T22:15:06.196305+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}