CVE-2021-3345
Status: ModifiedHigh (7.8)—
_gcry_md_block_write in cipher/hash-common.c in Libgcrypt version 1.9.0 has a heap-based buffer overflow when the digest final function sets a large count value. It is recommended to upgrade to 1.9.1 or later.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Base score: 7.8
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 1.06%
- Percentile among all scored CVEs: 63
- Score date: 10/4/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (2)
CWEs
- CWE-787
References
- https://bugs.gentoo.org/show_bug.cgi?id=767814
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=512c0c75276949f13b6373b5c04f7065af750b08
- https://gnupg.org
- https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000455.html
- https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000456.html
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://bugs.gentoo.org/show_bug.cgi?id=767814
- https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=512c0c75276949f13b6373b5c04f7065af750b08
- https://gnupg.org
- https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000455.html
- https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000456.html
- https://www.oracle.com//security-alerts/cpujul2021.html
Raw JSON (NVD)
Show
{
"id": "CVE-2021-3345",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 7.2,
"accessVector": "LOCAL",
"vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
"authentication": "NONE",
"integrityImpact": "COMPLETE",
"accessComplexity": "LOW",
"availabilityImpact": "COMPLETE",
"confidentialityImpact": "COMPLETE"
},
"acInsufInfo": false,
"impactScore": 10,
"baseSeverity": "HIGH",
"obtainAllPrivilege": false,
"exploitabilityScore": 3.9,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.8,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1.8
}
]
},
"affected": [
{
"source": "cve@mitre.org",
"affectedData": [
{
"vendor": "n/a",
"product": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
]
}
],
"published": "2021-01-29T15:15:13.083",
"references": [
{
"url": "https://bugs.gentoo.org/show_bug.cgi?id=767814",
"tags": [
"Issue Tracking",
"Vendor Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=512c0c75276949f13b6373b5c04f7065af750b08",
"source": "cve@mitre.org"
},
{
"url": "https://gnupg.org",
"tags": [
"Vendor Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000455.html",
"tags": [
"Mailing List",
"Vendor Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000456.html",
"tags": [
"Mailing List",
"Patch",
"Vendor Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "https://www.oracle.com//security-alerts/cpujul2021.html",
"tags": [
"Third Party Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "https://bugs.gentoo.org/show_bug.cgi?id=767814",
"tags": [
"Issue Tracking",
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=512c0c75276949f13b6373b5c04f7065af750b08",
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://gnupg.org",
"tags": [
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000455.html",
"tags": [
"Mailing List",
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://lists.gnupg.org/pipermail/gnupg-announce/2021q1/000456.html",
"tags": [
"Mailing List",
"Patch",
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://www.oracle.com//security-alerts/cpujul2021.html",
"tags": [
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-787"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "_gcry_md_block_write in cipher/hash-common.c in Libgcrypt version 1.9.0 has a heap-based buffer overflow when the digest final function sets a large count value. It is recommended to upgrade to 1.9.1 or later."
},
{
"lang": "es",
"value": "La función _gcry_md_block_write en el archivo cipher/hash-common.c en la versión 1.9.0 de Libgcrypt tiene un desbordamiento de búfer basado en la pila cuando la función final del resumen establece un valor de recuento grande. Se recomienda actualizar a la versión 1.9.1 o posterior."
}
],
"lastModified": "2026-06-17T04:04:58.500",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:gnupg:libgcrypt:1.9.0:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "3C089126-C397-4D68-A2E5-AC0F4973AC1A"
}
],
"operator": "OR"
}
]
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:oracle:communications_billing_and_revenue_management:12.0.0.3.0:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "E39D442D-1997-49AF-8B02-5640BE2A26CC"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "cve@mitre.org"
}