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CVE-2021-28860

30
FAUCET Score

CVE-2021-28860 is a critical prototype pollution vulnerability affecting Node.js mixme versions prior to v0.5.1. An unauthenticated attacker can manipulate object properties via the '__proto__' attribute through the mutate() and merge() functions, leading to a denial of service. The vulnerability has a CVSS score of 9.1 (Critical) due to its network-based attack vector, low attack complexity, and high impact on availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.5.1CPE matchmatch criteria
cpe:2.3:a:adaltas:mixme:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.83%
Probability of exploitation in next 30 days
EPSS Percentile
76.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0183 is in the 65th percentile among its peer group of 36,862 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: mixmeFixed in: 0.5.1

Vendor Advisories (1)

npmGHSA-r5cq-9537-9rpfcritical

Prototype Pollution in mixme

Feb 10, 2022

References

github.com / adaltas/node-mixme/commit/cfd5fbfc32368bcf7e06d1c5985ea60e34cd4028
PatchThird Party Advisory
github.com / adaltas/node-mixme/issues/1
Issue TrackingThird Party Advisory
github.com / adaltas/node-mixme/security/advisories/GHSA-79jw-6wg7-r9g4
PatchThird Party Advisory
security.netapp.com / advisory/ntap-20210618-0005
Third Party Advisory
npmjs.com / ~david
Third Party Advisory