CVE-2021-30551
No source can show you its own past. This one can.
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Type confusion in V8 in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
rank 74 = 40 + 22 + 1 + 5 + 6
rank@v1 · act now
Someone is already using it
CISA KEV catalog · public proof-of-concept · FIRST EPSS
EPSS 0.64701 · CISA KEV listed · without this subject the record ranks 34
What it costs you if it fires
NVD CVSS base score, then the CNA's own
CVSS 8.8, from NVD · without this subject the record ranks 52
It is getting worse, not staying still
FIRST EPSS series, rescorings and bad loads removed
rose on 2025-11-30 · without this subject the record ranks 73
How much of the world it touches
NVD CPE configurations
3 products in the CPE ranges · without this subject the record ranks 69
Someone else already set the date
CISA KEV remediation due date
CISA remediation date held · without this subject the record ranks 68
$3.23M = $4.99M incident cost x 1 exposure x 0.64701 likelihood
udv@v1 · unaudited · wrong for you until you say what you run
$4.99M is the cost of a breach that happened, from IBM Cost of a Data Breach Report 2026, global average. It is not the value of any asset of yours. That average already covers breaches of every severity, so scaling it by exposure understates a partial-impact record. That is an assumption, not a measurement. Your own asset value goes in the decision record.
Hindsight · the state
Foresight · where to check next
This record is one instance of CWE-843, access of resource using incompatible type ('type confusion'). The index holds 923 prior instances of this class, 41 KEV-listed. taxonomy@v1
Running Google Chrome? Check your version
A deterministic range check against the ranges this record publishes. It tells you where a version sits in the record, not whether your deployment is exploitable. No account needed.
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Harm, if it fires from the vector and the weakness
Written for the ticket you're about to file.
CISA KEV & Federal Remediation Deadline from the record and CISA
The fix, and how long it's been waiting.
Exploit Status & Known PoCs a ladder, not a score
Current rung: Exploited in the wild · CISA KEV listed, 2021-11-03.
A rung lights from a row in the index, never from an assessment. "Held sources" is the true scope of the claim: this index reads the CVE record, NVD, CISA KEV, FIRST's EPSS and public proof-of-concept repositories, and it does not observe attacks.
What it is stated by the CNA
Type confusion in V8 in Google Chrome prior to 91.0.4472.101 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. receipt
NVD's analysis a second authority
- severity
- 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- weakness
- CWE-843
- affected versions
- google chrome < 91.0.4472.101; fedoraproject fedora 33; fedoraproject fedora 34
- also scored by
- 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
check it yourself chromereleases.googleblog.com crbug.com security.gentoo.org lists.fedoraproject.org lists.fedoraproject.org security.gentoo.org receipt
Dated events
Movement the material steps
Show all 80 observations
80 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt
The full biography
Listed by CISA 141 days after it published and the record had been public for 5 years, 2 months when this index was last written.
No material movement in 81 days as of the last ingest this index recorded.
The pattern, elsewhere
This record is one instance of CWE-843, access of resource using incompatible type ('type confusion'). The index holds 923 prior instances of this class, 41 KEV-listed. [email protected]
923 records in this class held. The six above are ranked by exploit maturity, then recency.
Siblings and hubs
Records related to this one
None. No alias set, and nothing in the corpus cites this identifier or shares its product family within 60 days.
Browse the index from here
These are index-wide views, not findings about CVE-2021-30551.
What usually comes next
Everything above needs no account. What is below is work: assembling it, scoping it to your estate, watching it, and handing it to someone else.