CVE-2021-21042

mediumpriority · track · 41EPSS 0.147 · 97 %ileexploit · PoCEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

2 exploits · PoC

Likely / severe?

14.7% (97th) EPSS

CVSS 4.3 · medium

Is it mine?

16 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

Acrobat Reader DC versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by an Out-of-bounds Read vulnerability that could lead to arbitrary disclosure of information in the memory stack. An attacker could leverage this vulnerability to bypass mitigations such as ASLR. 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.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

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

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.06.5mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.06.5mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:Nsecondary · psirt@adobe.comexploitability 2.8 · impact 3.6

v3.16.5mediumAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.16.2mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USCWE-125US

exploits (2)

Public proof-of-concept and weaponised exploit code.

NattiSamson/CVE-2021-21042Exploit code for CVE-2021-21042PoC · poc_in_github
r1l4-i3pur1l4/CVE-2021-21042r1l4-i3pur1l4/CVE-2021-21042PoC · poc_in_github

affected products (16)

Products and version ranges known to be affected.

Adobe Acrobat Reader≤ unspecified ≤2017.011.30188enisa_euvdEU
Adobe Acrobat Reader≤ unspecified ≤Noneenisa_euvdEU
Adobe Acrobat Reader≤ unspecified ≤2020.001.30018enisa_euvdEU
Adobe Acrobat Reader≤ unspecified ≤2020.013.20074enisa_euvdEU
Adobe Systems Inc. Adobe Acrobat 2017≤ 2017.011.30190 Classic 2017fstec_bduRU
Adobe Systems Inc. Adobe Acrobat 2020≤ 2020.001.30020 Classic 2020fstec_bduRU
Adobe Systems Inc. Adobe Acrobat Document Cloud≤ 2021.001.20135 Continuousfstec_bduRU
Adobe Systems Inc. Adobe Acrobat Reader 2017≤ 2017.011.30190 Classic 2017fstec_bduRU
Adobe Systems Inc. Adobe Acrobat Reader 2020≤ 2020.001.30020 Classic 2020fstec_bduRU
Adobe Systems Inc. Adobe Acrobat Reader Document Cloud≤ 2021.001.20135 Continuousfstec_bduRU
adobe acrobat17.0 → 17.011.30188nvdUScpe:2.3:a:adobe:acrobat:*:*:*:*:*:*:*:*
adobe acrobat20.0 → 20.001.30018nvdUScpe:2.3:a:adobe:acrobat:*:*:*:*:*:*:*:*
adobe acrobat dc≤ 20.013.20074nvdUScpe:2.3:a:adobe:acrobat_dc:*:*:*:*:*:*:*:*
adobe acrobat reader17.0 → 17.011.30188nvdUScpe:2.3:a:adobe:acrobat_reader:*:*:*:*:*:*:*:*
adobe acrobat reader20.0 → 20.001.300183nvdUScpe:2.3:a:adobe:acrobat_reader:*:*:*:*:*:*:*:*
adobe acrobat reader dc≤ 20.013.20074nvdUScpe: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 2021-02-11modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

scry

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