CVE-2021-21123

mediumpriority · track · 40EPSS 0.109 · 96 %ileexploit · PoCEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

10.9% (96th) 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

Insufficient data validation in File System API in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass filesystem restrictions via a crafted HTML page.

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⚠ sources disagree · low–medium · 3.7–6.5

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/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:N/I:H/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.13.7lowAV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

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

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US

exploits (1)

Public proof-of-concept and weaponised exploit code.

Puliczek/CVE-2021-21123-PoC-Google-Chrome🐱‍💻 👍 Google Chrome - File System Access API - vulnerabilities reported by Maciej Pulikowski | Total Bug Bounty Reward: $5.000 | CVE-2021-21123 and 5 more...PoC · poc_in_github

affected products (17)

Products and version ranges known to be affected.

Google Chromeunspecified → 88.0.4324.96enisa_euvdEU
Google Inc Google Chrome≤ 88.0.4324.96fstec_bduRU
Microsoft Corp Microsoft Edge≤ 88.0.705.50fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.2fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.1fstec_bduRU
Novell Inc. SUSE Package Hub for SUSE Linux Enterprise≤ 15 SP2fstec_bduRU
Novell Inc. SUSE Package Hub for SUSE Linux Enterprise≤ 15 SP1fstec_bduRU
АО «ИВК» Альт 8 СПall versionsfstec_bduRU
АО «Концерн ВНИИНС» ОС ОН «Стрелец»≤ 16.01.2023fstec_bduRU
АО «НППКТ» ОСОН ОСнова Оnyx≤ 2.1fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 4.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.6 «Смоленск»fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 9fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 10fstec_bduRU
google chrome< 88.0.4324.96nvdUScpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
microsoft edge chromium< 88.0.705.50nvdUScpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*

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 2021-02-09modified 2026-06-17

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+25171 more

references (14)

External citations — patches, advisories, analysis.

scry

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