CVE-2020-25853

{"containers": {"cna": {"affected": [{"product": "Realtek RTL8195A Wi-Fi Module", "vendor": "n/a", "versions": [{"status": "affected", "version": "Versions before 2020-04-21 (up to and excluding 2.08)"}]}], "descriptions": [{"lang": "en", "value": "The function CheckMic() in the Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020 (up to and excluding 2.08) does not validate the size parameter for an internal function, _rt_md5_hmac_veneer() or _rt_hmac_sha1_veneer(), resulting in a stack buffer over-read which can be exploited for denial of service. An attacker can impersonate an Access Point and attack a vulnerable Wi-Fi client, by injecting a crafted packet into the WPA2 handshake. The attacker does not need to know the network's PSK."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-126", "description": "Stack buffer over-read (CWE-126)", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-02-03T16:49:20.000Z", "orgId": "6b4ace4a-d6e0-415b-9ce8-aa20e97e4b24", "shortName": "VDOO"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "vuln@vdoo.com", "ID": "CVE-2020-25853", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Realtek RTL8195A Wi-Fi Module", "version": {"version_data": [{"version_value": "Versions before 2020-04-21 (up to and excluding 2.08)"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "The function CheckMic() in the Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020 (up to and excluding 2.08) does not validate the size parameter for an internal function, _rt_md5_hmac_veneer() or _rt_hmac_sha1_veneer(), resulting in a stack buffer over-read which can be exploited for denial of service. An attacker can impersonate an Access Point and attack a vulnerable Wi-Fi client, by injecting a crafted packet into the WPA2 handshake. The attacker does not need to know the network's PSK."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "Stack buffer over-read (CWE-126)"}]}]}, "references": {"reference_data": [{"name": "https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/", "refsource": "CONFIRM", "url": "https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T15:49:05.426Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/"}]}]}, "cveMetadata": {"assignerOrgId": "6b4ace4a-d6e0-415b-9ce8-aa20e97e4b24", "assignerShortName": "VDOO", "cveId": "CVE-2020-25853", "datePublished": "2021-02-03T16:49:20.000Z", "dateReserved": "2020-09-23T00:00:00.000Z", "dateUpdated": "2024-08-04T15:49:05.426Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

{"affected": [{"affectedData": [{"product": "Realtek RTL8195A Wi-Fi Module", "vendor": "n/a", "versions": [{"status": "affected", "version": "Versions before 2020-04-21 (up to and excluding 2.08)"}]}], "source": "vuln@vdoo.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:realtek:rtl8195a_firmware:*:*:*:*:*:*:*:*", "matchCriteriaId": "24D4DC02-E833-483C-885F-9E168E5F8A4C", "versionEndExcluding": "2.08", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:h:realtek:rtl8195a:-:*:*:*:*:*:*:*", "matchCriteriaId": "62A37D39-5134-4AFE-9F59-C8C36A113B04", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The function CheckMic() in the Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020 (up to and excluding 2.08) does not validate the size parameter for an internal function, _rt_md5_hmac_veneer() or _rt_hmac_sha1_veneer(), resulting in a stack buffer over-read which can be exploited for denial of service. An attacker can impersonate an Access Point and attack a vulnerable Wi-Fi client, by injecting a crafted packet into the WPA2 handshake. The attacker does not need to know the network's PSK."}, {"lang": "es", "value": "La funci\u00f3n CheckMic() en el m\u00f3dulo Wi-Fi Realtek RTL8195A anterior a versiones publicadas en Abril de 2020 (hasta y excluyendo la 2.08), no comprueba el par\u00e1metro size para una funci\u00f3n interna, _rt_md5_hmac_veneer() o _rt_hmac_sha1_veneer(), resulta en una lectura excesiva del b\u00fafer de pila que puede ser explotada para una denegaci\u00f3n de servicio. Un atacante puede hacerse pasar por un Access Point y atacar a un cliente Wi-Fi vulnerable al inyectar un paquete dise\u00f1ado en el protocolo de enlace WPA2. El atacante no necesita conocer el PSK de la red"}], "id": "CVE-2020-25853", "lastModified": "2026-06-17T03:07:23.613", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-02-03T17:15:14.187", "references": [{"source": "vuln@vdoo.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/"}], "sourceIdentifier": "vuln@vdoo.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-126"}], "source": "vuln@vdoo.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

{}