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Medium severity6.5NVD Advisory· Published Sep 29, 2021· Updated Jun 17, 2026

CVE-2021-39856

CVE-2021-39856

Description

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 visit an attacker controlled web page.

Affected products

6
  • Adobe Inc./Acrobat4 versions
    cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*+ 3 more
    • cpe:2.3:a:adobe:acrobat:*:*:*:*:classic:*:*:*range: >=17.011.30059,<=17.011.30199
    • cpe:2.3:a:adobe:acrobat_dc:*:*:*:*:continuous:*:*:*range: >=15.008.20082,<=21.005.20058
    • cpe:2.3:a:adobe:acrobat_reader:*:*:*:*:classic:*:*:*range: >=17.011.30059,<=17.011.30199
    • (no CPE)range: unspecified
  • Adobe Inc./Acrobat Reader Dc2 versions
    cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*+ 1 more
    • cpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:continuous:*:*:*range: >=15.008.20082,<=21.005.20058
    • (no CPE)range: <=2021.005.20060, <=2020.004.30006, <=2017.011.30199

Patches

Vulnerability mechanics

References

1

News mentions

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