CVE-2021-3666
Prototype Pollution in fiznool/body-parser-xml
body-parser-xml is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Prototype Pollution in fiznool/body-parser-xml
body-parser-xml is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
- Record
CVE-2021-3666- CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H - Weakness
- CWE-1321
- Updated
- 2026-11-02
EUVDEUVD-2021-1949
body-parser-xml is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
- Record
EUVD-2021-1949- CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-2ghc-6v89-pw9j
body-parser-xml vulnerable to Prototype Pollution
body-parser-xml is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
- Record
GHSA-2ghc-6v89-pw9j- CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H - Weakness
- CWE-915, CWE-1321
- Updated
- 2026-11-02
NVD
body-parser-xml is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
- Record
CVE-2021-3666- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-1321
- Updated
- 2026-11-02
OSV
body-parser-xml is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
- Record
CVE-2021-3666- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-09
OSVGHSA-2ghc-6v89-pw9j
body-parser-xml vulnerable to Prototype Pollution
body-parser-xml is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
- Record
GHSA-2ghc-6v89-pw9j- CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H - Weakness
- CWE-1321, CWE-915
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
body-parser-xmlnpm | before 2.0.3 | 2.0.3 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | OSV | |
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3666 is a high vulnerability (CVSS 7.6) in Fiznool Fiznool/body-parser-xml, published September 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.30%, the 70th percentile. Fixed in body-parser-xml 2.0.3.