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CVE-2021-4245

31
FAUCET Score

CVE-2021-4245 is a critical prototype pollution vulnerability in chbrown rfc6902, specifically affecting an unknown part of the pointer.ts file. This flaw allows an unauthenticated attacker to remotely manipulate object prototype attributes, leading to high impacts on confidentiality, integrity, and availability. While a patch (c006ce9faa43d31edb34924f1df7b79c137096cf) is available, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.0.0CPE matchmatch criteria
cpe:2.3:a:rfc6902_project:rfc6902:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.1
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.27%
Probability of exploitation in next 30 days
EPSS Percentile
66.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0127 is in the 53rd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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: rfc6902Fixed in: 5.0.0

Vendor Advisories (1)

npmGHSA-p495-jxh2-wrfgcritical

npm package rfc6902 vulnerable to Prototype Pollution

Dec 15, 2022

References

github.com / chbrown/rfc6902/commit/c006ce9faa43d31edb34924f1df7b79c137096cf
PatchThird Party Advisory
github.com / chbrown/rfc6902/pull/76
ExploitPatchThird Party Advisory
vuldb.com
Permissions RequiredThird Party Advisory