CVE-2025-8037

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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": "260CDC56-79EC-44BF-9555-BB4321552203", "versionEndExcluding": "140.1", "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": "99498D75-7441-458F-9C53-6ABCC7ED9AEC", "versionEndExcluding": "140.1", "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": "Setting a nameless cookie with an equals sign in the value shadowed other cookies. Even if the nameless cookie was set over HTTP and the shadowed cookie included the `Secure` attribute. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1."}, {"lang": "es", "value": "Al configurar una cookie sin nombre con un signo igual en su valor, se eclipsaban otras cookies. Incluso si la cookie sin nombre se configuraba mediante HTTP y la cookie eclipsada inclu\u00eda el atributo \u201cSecure\u201d. 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-2025-8037", "lastModified": "2026-10-05T15:10:00.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-8037", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-07-23T14:22:54.948290Z", "version": "2.0.3"}}]}, "published": "2025-07-22T21:15:50.860", "references": [{"source": "security@mozilla.org", "tags": ["Permissions Required"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1964767"}, {"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/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-614"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "firefox: thunderbird: Nameless cookies shadow secure cookies", "id": "2382719", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2382719"}, "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-614", "details": ["Setting a nameless cookie with an equals sign in the value shadowed other cookies. Even if the nameless cookie was set over HTTP and the shadowed cookie included the `Secure` attribute. 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:\nSetting a nameless cookie with an equals sign in the value shadows other cookies. Even if the nameless cookie was set over HTTP, and the shadowed cookie included the <code>Secure</code> attribute."], "name": "CVE-2025-8037", "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-2025-8037\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-8037\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=1964767\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": "2026-04-20T20:11:46.516471+00:00", "value": {"mitigation_remediation": ["Upgrade Mozilla Firefox to version\u00a0141\u00a0or newer, or ESR\u00a0140.1\u202for newer, to contain the fix.", "Upgrade Mozilla Thunderbird to version\u00a0141\u00a0or newer, or ESR\u00a0140.1\u202for newer, to contain the fix.", "Avoid using nameless cookies in web applications and enforce the Secure attribute for authentication\u2011related cookies to reduce the risk of impersonation."], "summary": {"action": "Immediate Patch", "impact": "Cookie hijacking / Authentication bypass"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox up to version 140 and any earlier ESR releases prior to 140.1, as well as Thunderbird up to version 140 and ESR releases before 140.1, are affected. Versions 141 (Firefox and Thunderbird) and ESR 140.1 provide the fix.", "description_and_impact": "Setting a cookie without a name but with a value that contains an equals sign causes that cookie to override (shadow) any existing cookie with the same name, even if the existing cookie is marked Secure and sent only over HTTPS. The flaw allows a malicious actor to overwrite or manipulate secure authentication cookies, potentially enabling session hijack or authentication bypass. The vulnerability is classified as CWE\u2011614, denoting improper handling of cookie data.", "risk_and_exploitability": "The CVSS score of 9.1 indicates a critical severity, while the EPSS score of less than 1% suggests that exploitation in the wild is currently low and the vulnerability is not listed in CISA's KEV catalog. Based on the description, it is inferred that an attacker could exploit the flaw by injecting a nameless cookie with an equals sign into a target domain\u2019s cookie store via a malicious site or script, thereby masking a secure session cookie and hijacking the session. The attack requires only the ability to set a cookie for the target domain, which can be achieved through normal web browsing or malicious web content."}}}}, "created": "2025-07-23T17:36:04.226613+00:00", "updated": "2026-04-20T20:15:06.221982+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}