CVE-2021-23663
Prototype Pollution
All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Prototype Pollution
All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.
- Record
CVE-2021-23663- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:P - Updated
- 2026-11-02
EUVDEUVD-2021-2604
All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.
- Record
EUVD-2021-2604- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:P - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-wjpc-cgvw-xx23
Prototype Pollution in sey
All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.
- Record
GHSA-wjpc-cgvw-xx23- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-1321
- Updated
- 2026-11-02
NVD
All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.
- Record
CVE-2021-23663- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - 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 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-1321
- Updated
- 2026-11-02
OSVGHSA-wjpc-cgvw-xx23
Prototype Pollution in sey
All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.
- Record
GHSA-wjpc-cgvw-xx23- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-1321
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
seynpm |
through 0.3.0 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-23663 is a medium vulnerability (CVSS 6.5) in Sey Project Sey, published December 10, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.21%, the 68th percentile. No source names a fixed version.