Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2020-7637

19
FAUCET Score

CVE-2020-7637 is a prototype pollution vulnerability affecting the class-transformer library prior to version 0.3.1, where the classToPlainFromExist function can be manipulated to modify properties of Object.prototype. This medium-severity vulnerability (CVSS 5.3) has a low impact on integrity, requiring no user interaction or privileges, and can be exploited over the network. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.3.1CPE matchmatch criteria
cpe:2.3:a:class-transformer_project:class-transformer:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.16%
Probability of exploitation in next 30 days
EPSS Percentile
63.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0116 is in the 41st percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: class-transformerFixed in: 0.3.1

Vendor Advisories (1)

npmGHSA-6gp3-h3jj-prx4medium

Prototype pollution in class-transformer

Apr 7, 2020

References

github.com / typestack/class-transformer/commit/8f04eb9db02de708f1a20f6f2d2bb309b2fed01e
PatchThird Party Advisory
snyk.io / vuln/SNYK-JS-CLASSTRANSFORMER-564431
ExploitThird Party Advisory