CVE-2021-39858

mediumpriority · track · 18EPSS 0.025 · 84 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.46% (84th) EPSS

CVSS 4.3 · medium

Is it mine?

17 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by an out-of-bounds read vulnerability that could lead to disclosure of arbitrary memory information in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

cvss

Technical severity, 0–10. One row per scoring source.

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.3–4.3

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v2.03.7lowAV:N/AC:M/Au:N/C:P/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.03.3lowCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.03.3lowCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:Nsecondary · psirt@adobe.comexploitability 1.8 · impact 1.4

v3.13.3lowAV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:Nsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USCWE-125US

affected products (17)

Products and version ranges known to be affected.

Adobe Acrobat Reader≤ unspecified ≤DC 2021 Julyenisa_euvdEU
Adobe Acrobat Reader≤ unspecified ≤20.0-Classic 2021 Julyenisa_euvdEU
Adobe Acrobat Reader≤ unspecified ≤Noneenisa_euvdEU
Adobe Acrobat Reader≤ unspecified ≤17.0-Classic 2021 Julyenisa_euvdEU
Adobe Systems Inc. Adobe Acrobat 2017≤ 2017.011.30202 Classic 2017fstec_bduRU
Adobe Systems Inc. Adobe Acrobat 2020≤ 2020.004.30015 Classic 2020fstec_bduRU
Adobe Systems Inc. Adobe Acrobat Document Cloud≤ 2021.007.20091Continuousfstec_bduRU
Adobe Systems Inc. Adobe Acrobat Reader 2017≤ 2017.011.30202 Classic 2017fstec_bduRU
Adobe Systems Inc. Adobe Acrobat Reader 2020≤ 2020.004.30015 Classic 2020fstec_bduRU
Adobe Systems Inc. Adobe Acrobat Reader Document Cloud≤ 2021.007.20091Continuousfstec_bduRU
adobe acrobat20.001.30005 → 20.004.30006nvdUScpe:2.3:a:adobe:acrobat:*:*:*:*:*:*:*:*
adobe acrobat 201717.011.30158 → 17.011.30199nvdUScpe:2.3:a:adobe:acrobat_2017:*:*:*:*:*:*:*:*
adobe acrobat dc20.006.20034 → 21.005.20058nvdUScpe:2.3:a:adobe:acrobat_dc:*:*:*:*:*:*:*:*
adobe acrobat dc20.006.20034 → 21.005.20060nvdUScpe:2.3:a:adobe:acrobat_dc:*:*:*:*:*:*:*:*
adobe acrobat reader20.001.30005 → 20.004.30006nvdUScpe:2.3:a:adobe:acrobat_reader:*:*:*:*:*:*:*:*
adobe acrobat reader 201717.011.30158 → 17.011.30199nvdUScpe:2.3:a:adobe:acrobat_reader_2017:*:*:*:*:*:*:*:*
adobe acrobat reader dc20.006.20034 → 21.005.20060nvdUScpe:2.3:a:adobe:acrobat_reader_dc:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2021-09-29modified 2026-06-17

references (8)

External citations — patches, advisories, analysis.

scry

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