CVE-2020-15366: ajv.js ajv
Vulnerability summary
CVE-2020-15366 is a medium (CVSS 6.8) vulnerability in ajv.js ajv. EPSS estimates a 2.31% chance of exploitation in the next 30 days, higher than 83.4% of scored vulnerabilities.
Not severe (CVSS 5.6, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7Timeline
- 15-07-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in ajv.validate() in Ajv (aka Another JSON Schema Validator) 6.12.2. A carefully crafted JSON schema could be provided that allows execution of other code by prototype pollution. (While untrusted schemas are recommended against, the worst case of an untrusted schema should be a denial of service, not execution of code.)
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · DebianEcosystem advisory · calculated5.6MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- OSV · NpmEcosystem advisory · calculated5.6MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- NVDNIST5.6MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS trend
Probability
2.31%
Chance of exploitation in the next 30 days
Percentile
83%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.31% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ajv.js1 product
- ajv6.12.2
Debian1 product
- node-ajv< 6.12.4-1
Npm1 product
- ajv< 6.12.3
Ubuntu1 product
- node-ajvAll versions (No fix recorded)
4 vendors · 4 products
References
11 links
- github.com/ajv-validator/ajvPACKAGE