FKIE_CVE-2020-12399
Vulnerability from fkie_nvd - Published: 2020-07-09 15:15 - Updated: 2026-06-17 02:51
Severity
Summary
NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| mozilla | firefox | * | |
| mozilla | firefox_esr | * | |
| mozilla | thunderbird | * | |
| debian | debian_linux | 9.0 |
{
"affected": [
{
"affectedData": [
{
"product": "Thunderbird",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "68.9.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "77",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"product": "Firefox ESR",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "68.9",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
],
"source": "security@mozilla.org"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
"matchCriteriaId": "953DA746-3B0F-4926-B859-CA94CD65E4F2",
"versionEndExcluding": "77.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*",
"matchCriteriaId": "7113E7DB-1A88-4F93-AC2E-26DD06078EE4",
"versionEndExcluding": "68.9.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*",
"matchCriteriaId": "A5275EC9-3455-4BAE-A71E-13205D5123E6",
"versionEndExcluding": "68.9.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
"matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerability affects Thunderbird \u003c 68.9.0, Firefox \u003c 77, and Firefox ESR \u003c 68.9."
},
{
"lang": "es",
"value": "NSS ha mostrado diferencias de sincronizaci\u00f3n cuando se llevan a cabo firmas DSA, que fue explotable y eventualmente podr\u00eda filtrar claves privadas. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 68.9.0, Firefox versiones anteriores a 77 y Firefox ESR versiones anteriores a 68.9"
}
],
"id": "CVE-2020-12399",
"lastModified": "2026-06-17T02:51:45.670",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "LOW",
"cvssData": {
"accessComplexity": "HIGH",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 1.2,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:L/AC:H/Au:N/C:P/I:N/A:N",
"version": "2.0"
},
"exploitabilityScore": 1.9,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": true
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 4.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 0.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2020-07-09T15:15:10.757",
"references": [
{
"source": "security@mozilla.org",
"tags": [
"Issue Tracking",
"Permissions Required",
"Vendor Advisory"
],
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1631576"
},
{
"source": "security@mozilla.org",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html"
},
{
"source": "security@mozilla.org",
"tags": [
"Third Party Advisory"
],
"url": "https://security.gentoo.org/glsa/202007-49"
},
{
"source": "security@mozilla.org",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4421-1/"
},
{
"source": "security@mozilla.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2020/dsa-4726"
},
{
"source": "security@mozilla.org",
"tags": [
"Vendor Advisory"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-20/"
},
{
"source": "security@mozilla.org",
"tags": [
"Vendor Advisory"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-21/"
},
{
"source": "security@mozilla.org",
"tags": [
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],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-22/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1631576"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://security.gentoo.org/glsa/202007-49"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://usn.ubuntu.com/4421-1/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2020/dsa-4726"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-20/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-21/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-22/"
}
],
"sourceIdentifier": "security@mozilla.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-203"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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