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CVE-2021-3666

30
FAUCET Score

CVE-2021-3666 describes a critical Prototype Pollution vulnerability in the xml_body_parser_project's xml_body_parser, allowing attackers to improperly modify object prototype attributes. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with no user interaction, leading to complete compromise of confidentiality, integrity, and availability. Despite its high severity, there is currently no evidence of active exploitation, public exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.3CPE matchmatch criteria
cpe:2.3:a:xml_body_parser_project:xml_body_parser:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.0

7.6HIGH

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
4.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.30%
Probability of exploitation in next 30 days
EPSS Percentile
67.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0130 is in the 54th 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: body-parser-xmlFixed in: 2.0.3

Vendor Advisories (1)

npmGHSA-2ghc-6v89-pw9jhigh

body-parser-xml vulnerable to Prototype Pollution

Sep 14, 2021

References

github.com / fiznool/body-parser-xml/commit/d46ca622560f7c9a033cd9321c61e92558150d63
PatchThird Party Advisory
huntr.dev / bounties/1-other-fiznool/body-parser-xml
ExploitThird Party Advisory