What is CVE-2021-39856?

CVE-2021-39856 is a medium-severity vulnerability in Adobe Acrobat, classified under Information Disclosure. CVSS score: 6.5/10. Published 2021-09-29.

How severe is CVE-2021-39856?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Information disclosure in Adobe Acrobat

CVE-2021-39856

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.

Vulnerability class: Information Disclosure

EPSS: 0.024 (82.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Adobe Acrobat
Adobe Acrobat_dc
Adobe Acrobat Reader — versions unspecified
Adobe Acrobat_reader
Adobe Acrobat_reader_dc
Apple Macos
Microsoft Windows

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

psirt@adobe.com (x_refsource_MISC, Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-39856?: CVE-2021-39856 is a medium-severity vulnerability in Adobe Acrobat, classified under Information Disclosure. CVSS score: 6.5/10. Published 2021-09-29.
How severe is CVE-2021-39856?: Medium severity. CVSS v3 base score is 6.5 out of 10.