CVE-2021-28545
Status: ModifiedHigh (8.1)—
Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are missing support for an integrity check. An unauthenticated attacker would have the ability to completely manipulate data in a certified PDF without invalidating the original certification. Exploitation of this issue requires user interaction in that a victim must open the tampered file.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- Base score: 8.1
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 2.27%
- Percentile among all scored CVEs: 83
- Score date: 10/7/2026
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 (4)
CWEs
- CWE-353
References
Raw JSON (NVD)
Show
{
"id": "CVE-2021-28545",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 5.8,
"accessVector": "NETWORK",
"vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
"authentication": "NONE",
"integrityImpact": "PARTIAL",
"accessComplexity": "MEDIUM",
"availabilityImpact": "NONE",
"confidentialityImpact": "PARTIAL"
},
"acInsufInfo": false,
"impactScore": 4.9,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 8.6,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": true
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "psirt@adobe.com",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 8.1,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
"integrityImpact": "HIGH",
"userInteraction": "REQUIRED",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.2,
"exploitabilityScore": 2.8
},
{
"type": "Secondary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 8.1,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
"integrityImpact": "HIGH",
"userInteraction": "REQUIRED",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.2,
"exploitabilityScore": 2.8
}
]
},
"affected": [
{
"source": "psirt@adobe.com",
"affectedData": [
{
"vendor": "Adobe",
"product": "Acrobat Reader",
"versions": [
{
"status": "affected",
"version": "unspecified",
"versionType": "custom",
"lessThanOrEqual": "2020.013.20074"
},
{
"status": "affected",
"version": "unspecified",
"versionType": "custom",
"lessThanOrEqual": "2020.001.30018"
},
{
"status": "affected",
"version": "unspecified",
"versionType": "custom",
"lessThanOrEqual": "2017.011.30188"
},
{
"status": "affected",
"version": "unspecified",
"versionType": "custom",
"lessThanOrEqual": "None"
}
]
}
]
}
],
"published": "2021-04-01T14:15:13.390",
"references": [
{
"url": "https://helpx.adobe.com/security/products/acrobat/apsb21-09.html",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "psirt@adobe.com"
},
{
"url": "https://helpx.adobe.com/security/products/acrobat/apsb21-09.html",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Secondary",
"source": "psirt@adobe.com",
"description": [
{
"lang": "en",
"value": "CWE-353"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are missing support for an integrity check. An unauthenticated attacker would have the ability to completely manipulate data in a certified PDF without invalidating the original certification. Exploitation of this issue requires user interaction in that a victim must open the tampered file."
},
{
"lang": "es",
"value": "Las versiones de Acrobat Reader DC 2020.013.20074 (y anteriores), 2020.001.30018 (y anteriores) y 2017.011.30188 (y anteriores) carecen de soporte para una comprobación de integridad. Un atacante no autentificado podría manipular completamente los datos de un PDF certificado sin invalidar la certificación original. La explotación de este problema requiere la interacción del usuario, ya que la víctima debe abrir el archivo manipulado"
}
],
"lastModified": "2026-06-17T03:46:30.340",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*",
"vulnerable": true,
"matchCriteriaId": "163AD098-8E6F-4710-BBB2-7D20A5ECE010",
"versionEndIncluding": "17.011.30188",
"versionStartIncluding": "17.011.30059"
},
{
"criteria": "cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6AA3B8F3-7E2D-4463-AEC6-53AF49EB511F",
"versionEndIncluding": "20.001.30018",
"versionStartIncluding": "20.001.30005"
},
{
"criteria": "cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8DE0EAFA-C01C-4AF3-A80D-3060C2976176",
"versionEndIncluding": "20.013.20074",
"versionStartIncluding": "15.008.20082"
},
{
"criteria": "cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:*",
"vulnerable": true,
"matchCriteriaId": "E769E3AF-BCD8-4894-A5F3-7318DA56ABF1",
"versionEndIncluding": "17.011.30188",
"versionStartIncluding": "17.011.30059"
},
{
"criteria": "cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:*",
"vulnerable": true,
"matchCriteriaId": "85DA6685-CB53-45D3-B4C3-3486E2439A97",
"versionEndIncluding": "20.001.30018",
"versionStartIncluding": "20.001.30005"
},
{
"criteria": "cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*",
"vulnerable": true,
"matchCriteriaId": "85092AF3-B5E3-4192-ABA3-C6BEC56E3EEF",
"versionEndIncluding": "20.013.20074",
"versionStartIncluding": "15.008.20082"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"
},
{
"criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"
}
],
"operator": "OR"
}
],
"operator": "AND"
}
],
"sourceIdentifier": "psirt@adobe.com"
}