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CVE-2020-7774Prototype Pollution
- 7.3HighCVSS base score
- 69.6%Exploitation in 30 daysEPSS · top 0.6% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
The package y18n before 3.2.2, 4.0.1 and 5.0.5, is vulnerable to Prototype Pollution.
Timeline
ID reserved
By snyk
- 10 months later
· 10 months later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| snykCNA (assigner) | 3.1 | High7.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P |
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 69.6% · top 0.6% of all CVEs (12 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.3.
Affected products
y18n
- affected unspecified – < 5.0.5
Affected packages
From reviewed advisories of the GitHub Advisory Database.
References
References6
- https://snyk.io/vuln/SNYK-JS-Y18N-1021887 (opens in a new tab)x_transferred
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1038306 (opens in a new tab)x_transferred
- https://github.com/yargs/y18n/pull/108 (opens in a new tab)x_transferred
- https://github.com/yargs/y18n/issues/96 (opens in a new tab)x_transferred
- https://www.oracle.com/security-alerts/cpuApr2021.html (opens in a new tab)x_transferred
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-0643 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-c4w7-xm78-47vh (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2020-7774)Record last updated .