CVE-2025-8033

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{"affected": [{"affectedData": [{"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "115.*", "status": "unaffected", "version": "115.26", "versionType": "rpm"}, {"lessThanOrEqual": "128.*", "status": "unaffected", "version": "128.13", "versionType": "rpm"}, {"lessThanOrEqual": "140.*", "status": "unaffected", "version": "140.1", "versionType": "rpm"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "141", "versionType": "rpm"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThanOrEqual": "128.*", "status": "unaffected", "version": "128.13", "versionType": "rpm"}, {"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": "D697EDEE-5DF4-4FC2-8128-BC9DC23EFFF3", "versionEndExcluding": "115.26.0", "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:firefox:*:*:*:*:esr:*:*:*", "matchCriteriaId": "A621920F-5B71-403D-B8F9-EC22F249CD4C", "versionEndExcluding": "128.13.0", "versionStartIncluding": "128.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*", "matchCriteriaId": "BB48C2EF-A6AC-4445-9417-1B65D5BC509B", "versionEndExcluding": "140.1.0", "versionStartIncluding": "140.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*", "matchCriteriaId": "B9BB9B0C-2B49-44EA-9BED-241A8CE8794E", "versionEndExcluding": "128.13.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*", "matchCriteriaId": "95D506DD-BD9B-4D90-802F-5BE673F1CF14", "versionEndExcluding": "141.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*", "matchCriteriaId": "8CE266C2-5AF1-4C57-9B7C-47039FF06384", "versionEndExcluding": "140.1.0", "versionStartIncluding": "140.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1."}, {"lang": "es", "value": "El motor de JavaScript no gestionaba correctamente los generadores cerrados y era posible resumirlos, lo que provocaba una desreferencia nullptr. Esta vulnerabilidad afecta a Firefox menor que 141, Firefox ESR menor que 115.26, Firefox ESR menor que 128.13, Firefox ESR menor que 140.1, Thunderbird menor que 141, Thunderbird menor que 128.13 y Thunderbird menor que 140.1."}], "id": "CVE-2025-8033", "lastModified": "2026-10-05T15:10:00.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-8033", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-07-23T13:36:06.360574Z", "version": "2.0.3"}}]}, "published": "2025-07-22T21:15:50.457", "references": [{"source": "security@mozilla.org", "tags": ["Permissions Required"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1973990"}, {"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/mfsa2025-57/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-58/"}, {"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/mfsa2025-62/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2025-63/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:11797", "cpe": "cpe:/o:redhat:enterprise_linux:10.0", "package": "firefox-0:128.13.0-1.el10_0", "product_name": "Red Hat Enterprise Linux 10", "release_date": "2025-07-28T00:00:00Z"}, {"advisory": "RHSA-2025:11747", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:128.13.0-1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-07-24T00:00:00Z"}, {"advisory": "RHSA-2025:11748", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "firefox-0:128.13.0-1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-07-24T00:00:00Z"}], "bugzilla": {"description": "firefox: thunderbird: Incorrect JavaScript state machine for generators", "id": "2382717", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2382717"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N", "status": "verified"}, "cwe": "CWE-476", "details": ["The JavaScript engine did not handle closed generators correctly and it was possible to resume them leading to a nullptr deref. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.", "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nThe JavaScript engine did not handle closed generators correctly, and it was possible to resume them, resulting in a nullptr dereference."], "name": "CVE-2025-8033", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "rhel10/firefox-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "rhel10/thunderbird-flatpak", "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: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": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"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:8", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-07-22T20:49:27Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-8033\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-8033\nhttps://www.mozilla.org/security/advisories/mfsa2025-58/#CVE-2025-8033\nhttps://www.mozilla.org/security/advisories/mfsa2025-62/#CVE-2025-8033"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-20T16:53:47.582944+00:00", "value": {"mitigation_remediation": ["Apply the latest Firefox patch: upgrade to at least version 141 or the relevant ESR update (115.26, 128.13, or 140.1).", "Apply the latest Thunderbird patch: upgrade to at least version 141 or the relevant ESR update (128.13 or 140.1).", "If an immediate upgrade is not possible, block or disable JavaScript execution in the affected browsers or use a content\u2011filtering add\u2011on to prevent malicious script execution as a temporary measure."], "summary": {"action": "Patch Now", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox versions up to 140 and all releases before 141 are vulnerable, as are the ESR builds 115.26, 128.13, and 140.1. Mozilla Thunderbird versions up to 140 and the ESR builds 128.13 and 140.1 are also impacted.", "description_and_impact": "The bug in the engine incorrectly handled closed generators, enabling an attacker to resume a closed generator and trigger a null pointer dereference, causing the browser or email client to crash. This flaw is a classic null pointer dereference (CWE\u2011476).", "risk_and_exploitability": "The CVSS score of 6.5 indicates moderate severity, and the EPSS score of less than 1% shows a very low exploitation probability. The flaw requires JavaScript execution in a web page or email, so the attack vector is likely local or via malicious content rather than remote code execution. It is not listed in the CISA KEV. The primary consequence is a denial of service; an attacker could force a user to close the application or launch subsequent denial attacks, provided the generator is closed and then resumed through crafted scripts."}}}}, "created": "2025-07-23T17:35:59.689864+00:00", "updated": "2026-04-20T17:00:12.732723+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}