CVE-2021-23991

{"containers": {"cna": {"affected": [{"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThan": "78.9.1", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "If a Thunderbird user has previously imported Alice's OpenPGP key, and Alice has extended the validity period of her key, but Alice's updated key has not yet been imported, an attacker may send an email containing a crafted version of Alice's key with an invalid subkey, Thunderbird might subsequently attempt to use the invalid subkey, and will fail to send encrypted email to Alice. This vulnerability affects Thunderbird < 78.9.1."}], "problemTypes": [{"descriptions": [{"description": "An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-06-24T13:27:10.000Z", "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "shortName": "mozilla"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-13/"}, {"tags": ["x_refsource_MISC"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1673240"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@mozilla.org", "ID": "CVE-2021-23991", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Thunderbird", "version": {"version_data": [{"version_affected": "<", "version_value": "78.9.1"}]}}]}, "vendor_name": "Mozilla"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "If a Thunderbird user has previously imported Alice's OpenPGP key, and Alice has extended the validity period of her key, but Alice's updated key has not yet been imported, an attacker may send an email containing a crafted version of Alice's key with an invalid subkey, Thunderbird might subsequently attempt to use the invalid subkey, and will fail to send encrypted email to Alice. This vulnerability affects Thunderbird < 78.9.1."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key"}]}]}, "references": {"reference_data": [{"name": "https://www.mozilla.org/security/advisories/mfsa2021-13/", "refsource": "MISC", "url": "https://www.mozilla.org/security/advisories/mfsa2021-13/"}, {"name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1673240", "refsource": "MISC", "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1673240"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T19:14:10.003Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-13/"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1673240"}]}]}, "cveMetadata": {"assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe", "assignerShortName": "mozilla", "cveId": "CVE-2021-23991", "datePublished": "2021-06-24T13:27:10.000Z", "dateReserved": "2021-01-13T00:00:00.000Z", "dateUpdated": "2024-08-03T19:14:10.003Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThan": "78.9.1", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "717003F7-C1B4-4A52-A10F-13DB37ED1FCE", "versionEndExcluding": "78.9.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "If a Thunderbird user has previously imported Alice's OpenPGP key, and Alice has extended the validity period of her key, but Alice's updated key has not yet been imported, an attacker may send an email containing a crafted version of Alice's key with an invalid subkey, Thunderbird might subsequently attempt to use the invalid subkey, and will fail to send encrypted email to Alice. This vulnerability affects Thunderbird < 78.9.1."}, {"lang": "es", "value": "Si un usuario de Thunderbird ha importado previamente la clave OpenPGP de Alice, y Alice ha ampliado el periodo de validez de su clave, pero la clave actualizada de Alice a\u00fan no ha sido importada, un atacante puede enviar un correo electr\u00f3nico conteniendo una versi\u00f3n dise\u00f1ada de la clave de Alice con una subclave no v\u00e1lida, Thunderbird podr\u00eda posteriormente intentar usar la subclave no v\u00e1lida, y producir\u00e1 un fallo al enviar el correo electr\u00f3nico cifrado a Alice. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 78.9.1"}], "id": "CVE-2021-23991", "lastModified": "2026-06-17T03:39:07.293", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "HIGH", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 4.9, "impactScore": 4.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-06-24T14:15:09.197", "references": [{"source": "security@mozilla.org", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1673240"}, {"source": "security@mozilla.org", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-13/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1673240"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-13/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Cure53 as the original reporter.", "affected_release": [{"advisory": "RHSA-2021:1192", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "thunderbird-0:78.9.1-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1193", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:78.9.1-1.el8_3", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1190", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "thunderbird-0:78.9.1-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-04-14T00:00:00Z"}, {"advisory": "RHSA-2021:1201", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "thunderbird-0:78.9.1-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-04-14T00:00:00Z"}], "bugzilla": {"description": "Mozilla: An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key", "id": "1948393", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1948393"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N", "status": "verified"}, "cwe": "CWE-347", "details": ["If a Thunderbird user has previously imported Alice's OpenPGP key, and Alice has extended the validity period of her key, but Alice's updated key has not yet been imported, an attacker may send an email containing a crafted version of Alice's key with an invalid subkey, Thunderbird might subsequently attempt to use the invalid subkey, and will fail to send encrypted email to Alice. This vulnerability affects Thunderbird < 78.9.1."], "name": "CVE-2021-23991", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}], "public_date": "2021-04-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-23991\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-23991"], "threat_severity": "Moderate"}

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