CVE-2021-39855

Published on: 09/29/2021 12:00:00 AM UTC

Last Modified on: 10/07/2021 12:17:00 AM UTC

CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

Certain versions of Acrobat from Adobe contain the following vulnerability:

Acrobat Reader DC ActiveX Control versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by an Information Disclosure vulnerability. An unauthenticated attacker could leverage this vulnerability to obtain NTLMv2 credentials. Exploitation of this issue requires user interaction in that a victim must open a maliciously crafted Microsoft Office file, or visit an attacker controlled web page.

  • CVE-2021-39855 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as MEDIUM severity.
  • Affected Vendor/Software: URL Logo Adobe - Acrobat Reader version <= DC 2021 July
  • Affected Vendor/Software: URL Logo Adobe - Acrobat Reader version <= 20.0-Classic 2021 July
  • Affected Vendor/Software: URL Logo Adobe - Acrobat Reader version <= 17.0-Classic 2021 July
  • Affected Vendor/Software: URL Logo Adobe - Acrobat Reader version <= None

CVSS3 Score: 6.5 - MEDIUM

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW NONE REQUIRED
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED HIGH NONE NONE

CVSS2 Score: 4.3 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
PARTIAL NONE NONE

CVE References

Description Tags Link
Adobe Security Bulletin helpx.adobe.com
text/html
URL Logo MISC helpx.adobe.com/security/products/acrobat/apsb21-55.html

Related QID Numbers

  • 375845 Adobe Security Update for Adobe Acrobat and Adobe Reader (APSB21-55)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationAdobeAcrobatAllAllAllAll
ApplicationAdobeAcrobatAllAllAllAll
ApplicationAdobeAcrobat DcAllAllAllAll
ApplicationAdobeAcrobat DcAllAllAllAll
ApplicationAdobeAcrobat ReaderAllAllAllAll
ApplicationAdobeAcrobat ReaderAllAllAllAll
ApplicationAdobeAcrobat Reader DcAllAllAllAll
ApplicationAdobeAcrobat Reader DcAllAllAllAll
Operating
System
AppleMacos-AllAllAll
Operating
System
MicrosoftWindows-AllAllAll
  • cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*:
  • cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*:
  • cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*:
  • cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*:
  • cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:*:
  • cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:*:
  • cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*:
  • cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*:
  • cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-39855 : Acrobat Reader DC ActiveX Control versions 2021.005.20060 and earlier , 2020.004.30006 and earli… twitter.com/i/web/status/1… 2021-09-29 16:06:19
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