Prototype Pollution in Class-Transformer Project
CVE-2020-7637
class-transformer before 0.3.1 allow attackers to perform Prototype Pollution. The classToPlainFromExist function could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.
Vulnerability class: Prototype Pollution
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.012 (66.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Class-Transformer Project
- Class-Transformer — versions All versions prior to version 0.3.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/typestack/class-transformer/commit/8f04eb9db02de708f1a20f6f2d2bb309b… (Patch, Third Party Advisory)
- snyk.io/vuln/SNYK-JS-CLASSTRANSFORMER-564431 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-7637?
- CVE-2020-7637 is a medium-severity vulnerability in Class-Transformer Project, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 5.3/10. Published 2020-04-06.
- How severe is CVE-2020-7637?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2020-7637 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.