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Vulnerability details: VCID-9bcs-utd9-t3h6
Vulnerability ID VCID-9bcs-utd9-t3h6
Aliases CVE-2021-30533
Summary Insufficient policy enforcement in PopupBlocker in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restrictions via a crafted iframe.
Status Published
Exploitability 2.0
Weighted Severity 8.0
Risk 10.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-863 Incorrect Authorization
System Score Found at
epss 0.05226 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.05226 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.05226 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
epss 0.06446 https://api.first.org/data/v1/epss?cve=CVE-2021-30533
cvssv3.1 6.5 https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
ssvc Track https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
cvssv3.1 6.5 https://crbug.com/1145553
ssvc Track https://crbug.com/1145553
cvssv3.1 6.5 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
ssvc Track https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
cvssv3.1 6.5 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
ssvc Track https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2021-30533
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2021-30533
archlinux High https://security.archlinux.org/AVG-1990
archlinux High https://security.archlinux.org/AVG-1991
cvssv3.1 6.5 https://security.gentoo.org/glsa/202107-06
ssvc Track https://security.gentoo.org/glsa/202107-06
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-30533
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30533
1145553 https://crbug.com/1145553
202107-06 https://security.gentoo.org/glsa/202107-06
990079 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990079
ASA-202106-2 https://security.archlinux.org/ASA-202106-2
AVG-1990 https://security.archlinux.org/AVG-1990
AVG-1991 https://security.archlinux.org/AVG-1991
cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
CVE-2021-30533 https://nvd.nist.gov/vuln/detail/CVE-2021-30533
ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
stable-channel-update-for-desktop_25.html https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
Data source KEV
Date added June 27, 2022
Description Google Chromium PopupBlocker contains an insufficient policy enforcement vulnerability that allows a remote attacker to bypass navigation restrictions via a crafted iframe. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.
Required action Apply updates per vendor instructions.
Due date July 18, 2022
Note 
https://nvd.nist.gov/vuln/detail/CVE-2021-30533
Ransomware campaign use Unknown
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:A/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-04T15:04:01Z/ Found at https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://crbug.com/1145553
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:A/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-04T15:04:01Z/ Found at https://crbug.com/1145553
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:A/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-04T15:04:01Z/ Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:A/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-04T15:04:01Z/ Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-30533
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-30533
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://security.gentoo.org/glsa/202107-06
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:A/A:N/T:P/P:M/B:A/M:M/D:T/2025-02-04T15:04:01Z/ Found at https://security.gentoo.org/glsa/202107-06
Exploit Prediction Scoring System (EPSS)
Percentile 0.8956
EPSS Score 0.05226
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:37:40.269752+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.16/community.json 37.0.0