CVE-2021-30551 [Exploited]

CVE-2021-30551 is rated Critical Active Threat (98.8/100): CVSS High severity, with high exploitation likelihood (EPSS 82.22%, 99th percentile). CISA KEV confirms active exploitation (added 2021-11-03) affecting Google / Chromium V8. a weakness (CWE-843) Unauthenticated remote administrative access may be possible. EPSS rose +3.86% over the last day, indicating growing attacker interest. The CISA remediation deadline has passed—treat as an emergency patch priority.

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#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-14	78.36%	82.22%	+3.86%
2	2026-05-06	79.25%	78.36%	-0.89%
3	2026-04-30	—	79.25%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-14

78.36%

82.22%

+3.86%

2026-05-06

79.25%

78.36%

-0.89%

2026-04-30

—

79.25%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	[email protected]
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0
6.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	8.6	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.8

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

[email protected]

8.8

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

134c704f-9b21-4f2e-91b3-4a467353bcc0

6.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

8.6

6.4

[email protected]

OS Trackers for CVE-2021-30551

vendor	priority	summary	link
`alpine`	—	CVE-2021-30551: 2 source package rows (chromium, qt5-qtwebengine); 14 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 14, open 0.	https://security.alpinelinux.org/vuln/CVE-2021-30551
`debian`	not yet assigned	CVE-2021-30551 not yet assigned priority: Debian including 1 source packages (chromium), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2021-30551
`gentoo`	high	CVE-2021-30551: 2 GLSA(s) (202107-06, 202208-25), 4 atom(s) (dev-qt/qtwebengine, www-client/chromium, www-client/google-chrome, www-client/microsoft-edge); latest impact high.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-30551
`suse`	high	CVE-2021-30551 severity important: SUSE including 24 source package names (MozillaFirefox, chromedriver-91.0.4472.101-lp152.2.104.1, …), 26 product×package rows across 9 product lines (SUSE Linux Enterprise Server 11 SP3 for Teradata, SUSE Package Hub 15 SP3, … (9 product lines)): Fixed 25, Known Not Affected 1.	https://www.suse.com/security/cve/CVE-2021-30551/
`ubuntu`	medium	CVE-2021-30551 medium priority: Ubuntu including 1 source packages (chromium-browser), 9 status rows across 9 suites (bionic, focal, groovy, hirsute, impish, jammy, trusty, upstream, xenial): not-affected 4, DNE 2, released 2, ignored 1.	https://ubuntu.com/security/CVE-2021-30551

Affected software / configurations for CVE-2021-30551

Vendor	Product	Version	Raw CPE
google	chrome	< 91.0.4472.101	cpe:2.3:a:google:chrome::::::::
fedoraproject	fedora	33	cpe:2.3:o:fedoraproject:fedora:33:::::::*
fedoraproject	fedora	34	cpe:2.3:o:fedoraproject:fedora:34:::::::*

References for CVE-2021-30551

URL	Tags
https://chromereleases.googleblog.com/2021/06/stable-channel-update-for-desktop.html	Release Notes
https://crbug.com/1216437	Exploit Issue Tracking Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/	Release Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/	Release Notes
https://security.gentoo.org/glsa/202107-06	Third Party Advisory
https://security.gentoo.org/glsa/202208-25	Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30551	US Government Resource

URL

CVE-2021-30551

CISA KEV Record for CVE-2021-30551

Public exploit references (Exploit-DB) for CVE-2021-30551

Exploit prediction scoring system (EPSS) score for CVE-2021-30551

Common vulnerability scoring system (CVSS) metrics for CVE-2021-30551

Weakness enumeration for CVE-2021-30551

OS Trackers for CVE-2021-30551

Affected software / configurations for CVE-2021-30551

References for CVE-2021-30551