CVE-2022-2421: Socket.io - Improper type validation in attachment parsing
Noroxi assessment
Priority: Monitor (action score 39/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 1.4% (FIRST EPSS); higher than 73.5% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: socket.io-parser (npm) 3.4.2, 4.0.5, 4.2.1.
Low priority for now. Upgrade to socket.io-parser (npm) 3.4.2, 4.0.5, 4.2.1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
Due to improper type validation in attachment parsing the Socket.io js library, it is possible to overwrite the _placeholder object which allows an attacker to place references to functions at arbitrary places in the resulting query object.
- Published
- Oct 26, 2022
- Updated
- Jun 17, 2026
- EPSS
- 1.4% · 73th percentile
- CWE
- CWE-89
Report tools
Action score
39
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.4%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 9.8
- CNA · DIVD
- 10.0
- 0.2 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| socket | socket.io-parser | cpe:2.3:a:socket:socket.io-parser |
Versions reported by the vendor
Affected version ranges reported by the assigning authority (DIVD). Independent of NVD's CPE analysis and usually ahead of it.
Socket.io Socket.io-Parser
- 4.x and later · before 4.2.1affected
Affected versions · NVD (4)
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- socket socket.io-parserbefore 3.3.3
- socket socket.io-parser3.4.0 and later · before 3.4.2
- socket socket.io-parser4.0.0 and later · before 4.0.5
- socket socket.io-parser4.1.0 and later · before 4.2.1
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| npm | socket.io-parser | from 3.4.0 · before 3.4.2 | 3.4.2 |
| npm | socket.io-parser | from 4.0.0 · before 4.0.5 | 4.0.5 |
| npm | socket.io-parser | from 4.1.0 · before 4.2.1 | 4.2.1 |
| npm | socket.io-parser | before 3.3.3 | 3.3.3 |
Same product
socket: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-33151socket.io allows an unbounded number of binary attachments34Monitor
- CVE-2020-36049socket.io-parser before 3.4.1 allows attackers to cause a denial of service (memory consumption) via a large packet because a concatenation…31Monitor
- CVE-2023-32695Insufficient validation when decoding a Socket.IO packet30Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| npm:socket.io-parser | 3.3.3 | Package registry (OSV) |
| npm:socket.io-parser | 3.4.2 | Package registry (OSV) |
| npm:socket.io-parser | 4.0.5 | Package registry (OSV) |
| npm:socket.io-parser | 4.2.1 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Frank Breedijk (DIVD)analyst
- Thomas Rinsma (Codean)finder
- Victor Pasman (DIVD)analyst
Not on record for this CVE: EPSS history · patch commit or PR link · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-89 · Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Root cause
The query text is built by concatenating user input. The database cannot tell where the data ends and the command begins.
The bug in code
The whole CWE-89 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
const owner = req.query.owner;
const rows = await db.query(
"SELECT * FROM files WHERE owner = '" + owner + "'"
);Fixed
const owner = req.query.owner;
const rows = await db.query(
"SELECT * FROM files WHERE owner = $1",
[owner]
);Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Expanding Control over the Operating System from the DatabaseCAPEC-470Very High
- SQL InjectionCAPEC-66likelihood: High · High
- Blind SQL InjectionCAPEC-7likelihood: High · High
ATT&CK techniques
—
Change log (1)
- Fix✗ → ✓
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References
Show all references (1 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.