CVE-2025-9181

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{"bugzilla": {"description": "thunderbird: firefox: Uninitialized memory in the JavaScript Engine component", "id": "2389583", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2389583"}, "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-665", "details": ["Uninitialized memory in the JavaScript Engine component. This vulnerability affects Firefox < 142, Firefox ESR < 128.14, Firefox ESR < 140.2, Thunderbird < 142, Thunderbird < 128.14, and Thunderbird < 140.2.", "A flaw was found in Thunderbird and Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Uninitialized memory in the JavaScript Engine component."], "name": "CVE-2025-9181", "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": "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": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"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": "firefox", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-08-19T20:33:55Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-9181\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-9181\nhttps://www.mozilla.org/security/advisories/mfsa2025-66/#CVE-2025-9181\nhttps://www.mozilla.org/security/advisories/mfsa2025-71/#CVE-2025-9181"], "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": "2026-04-20T18:02:48.008117+00:00", "value": {"mitigation_remediation": ["Upgrade all Firefox and Thunderbird installations to a version that includes the fix (Firefox 142 or newer, ESR 128.14 or 140.2, Thunderbird 142 or newer, ESR 128.14 or 140.2).", "If an immediate update is impossible, disable or heavily restrict JavaScript execution for untrusted or unknown web content through the browser\u2019s policy settings to reduce the chance of triggering the flaw.", "When updating or policy changes cannot be applied, isolate users from potentially malicious sites by applying network segmentation or firewall rules that restrict outbound traffic to known safe domains, thereby limiting exposure to crafted scripts."], "summary": {"action": "Apply Patch", "impact": "Potential Information Disclosure"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox and Mozilla Thunderbird are affected. Unpatched releases include Firefox 142 and the ESR branches 128.14 and 140.2; Thunderbird 142 and the corresponding ESR releases 128.14 and 140.2. All earlier releases of these products are also vulnerable.", "description_and_impact": "The flaw occurs when the JavaScript engine reads memory that has not been initialized. This uninitialized memory read can expose arbitrary data stored in the browser process or cause the browser to crash. The vulnerability corresponds to CWE\u2011457 (Use of Uninitialized Variable) and CWE\u2011665 (Buffer Access with Incorrect Length Value). The official description does not state that the flaw enables direct code execution; the primary consequence is therefore the potential leakage of sensitive information or unintended denial of service.", "risk_and_exploitability": "The CVSS score of 6.5 indicates moderate severity while the EPSS score of < 1% points to a low current probability of exploitation. The vulnerability is not listed in the CISA KEV catalog, reinforcing the modest risk assessment. The likely attack vector involves malicious or compromised web pages delivering crafted JavaScript that executes in a user\u2019s browser session; the attacker would need to entice a user to visit a website or otherwise inject the code. Because the flaw does not provide an explicit remote code\u2011execution path, the risk focuses on potential information disclosure, but the exploitation remains plausible even with the low EPSS score."}}}}, "created": "2025-08-21T12:31:47.022790+00:00", "updated": "2026-04-20T18:15:13.612644+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}