CVE-2021-4321
Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass...
Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)
- Record
CVE-2021-4321- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
CVE List No score
Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)
- Record
CVE-2021-4321- Updated
- 2026-11-02
EUVDEUVD-2021-34150
Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)
- Record
EUVD-2021-34150- CVSS
- 0.0 None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-gr88-2rcg-w2cq
Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass...
Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)
- Record
GHSA-gr88-2rcg-w2cq- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSV
Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)
- Record
CVE-2021-4321- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
OSVDEBIAN-CVE-2021-4321
Policy bypass in Blink in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)
- Record
DEBIAN-CVE-2021-4321- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
chromiumDebian:12 |
before 97.0.4692.71-0.1 | 97.0.4692.71-0.1 |
chromiumDebian:13 |
before 97.0.4692.71-0.1 | 97.0.4692.71-0.1 |
chromiumDebian:14 |
before 97.0.4692.71-0.1 | 97.0.4692.71-0.1 |
chromiumDebian:11 From an advisory covering 123 CVEs |
before 97.0.4692.71-0.1~deb11u1, plus listed versions 90.0.4430.212-193.0.4577.82-1 |
97.0.4692.71-0.1~deb11u1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-4321 is a medium vulnerability (CVSS 4.3) in Google Chrome, published January 14, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. Fixed in chromium 97.0.4692.71-0.1.
References
chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
crbug.com/1161891
lists.fedoraproject.org/archives/list/[email protected]/message/PQKT7EGDD2P3L7S3NXEDDRCPK4NNZNWJ
nvd.nist.gov/vuln/detail/CVE-2021-4321
github.com/advisories/GHSA-gr88-2rcg-w2cq
security-tracker.debian.org/tracker/CVE-2021-4321