CVE-2022-23307
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A deserialization flaw in the Chainsaw component of Log4j 1 can lead to malicious code execution.
rank 46 = 14 + 22 + 0 + 10 + 0
rank@v1 · this cycle
Someone is already using it
CISA KEV catalog · public proof-of-concept · FIRST EPSS
EPSS 0.54411 · without this subject the record ranks 32
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 24
It is getting worse, not staying still
FIRST EPSS series, rescorings and bad loads removed
no persisting rise in 365 days · without this subject the record ranks 46
How much of the world it touches
NVD CPE configurations
20 products in the CPE ranges · without this subject the record ranks 36
Someone else already set the date
CISA KEV remediation due date
no CISA due date · without this subject the record ranks 46
$2.72M = $4.99M incident cost x 1 exposure x 0.54411 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
log4j 1.x is one instance of CWE-502, deserialization of untrusted data. The index holds 3288 prior instances of this class, 76 KEV-listed. 5 neighbors share the mechanism; each carries its own record state. taxonomy@v1
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Harm, if it fires from the vector and the weakness
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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: Nothing observed in held sources.
- RUNG 1Nothing observed in held sources
- RUNG 2Proof-of-concept published
- RUNG 3Exploited in the wild · CISA KEV listed
- RUNG 4Ransomware campaign use known
Affected & Fixed Versions as published
Show all 20 published ranges
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
CVE-2020-9493 identified a deserialization issue that was present in Apache Chainsaw. Prior to Chainsaw V2.0 Chainsaw was a component of Apache Log4j 1.2.x where the same issue exists. receipt
NVD's analysis a second authority
- severity
- 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- weakness
- CWE-502
- affected versions
- apache chainsaw < 2.1.0; apache log4j >= 1.2 < 2.0; qos reload4j < 1.2.18.1; and 17 more, listed in full below
- also scored by
- 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
check it yourself logging.apache.org lists.apache.org oracle.com oracle.com receipt
Dated events
Movement the material steps
This score more than doubled inside 72 hours. Both observations are in the full history below.
Show all 48 observations
48 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
Exploit probability more than doubled between 2025-12-01 and 2025-12-04 (0.00727 → 0.01857) and the record had been public for 4 years, 6 months when this index was last written.
The pattern, elsewhere
log4j 1.x is one instance of CWE-502, deserialization of untrusted data. The index holds 3288 prior instances of this class, 76 KEV-listed. 5 neighbors share the mechanism; each carries its own record state. [email protected]
3288 records in this class held. The six above are ranked by exploit maturity, then recency.
Siblings and hubs
Records related to this one
Its defect family
apache software foundation apache log4j
Of the 5 records in this family, this is the only one whose title names component lead malicious.
Grouped by shared product and weakness, not by shared vulnerability. Each record's own state is on its own page.
Family membership: computed, pro@dim2000
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What usually comes next
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