CVE-2021-23421
Prototype Pollution
All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Prototype Pollution
All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
- Record
CVE-2021-23421- CVSS 3.1
- 5.6 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:R - Updated
- 2026-11-02
EUVDEUVD-2021-2051
All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
- Record
EUVD-2021-2051- CVSS 3.1
- 5.6 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:U/RC:R - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f9cv-665r-275h
Prototype Pollution in merge-change
All current versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
- Record
GHSA-f9cv-665r-275h- 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 - Weakness
- CWE-915
- Updated
- 2026-11-02
NVD
All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
- Record
CVE-2021-23421- CVSS 3.1
- 5.6 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/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-f9cv-665r-275h
Prototype Pollution in merge-change
All current versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
- Record
GHSA-f9cv-665r-275h- 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 - Weakness
- CWE-915
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
merge-changenpm |
through 1.8.1 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| 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-2021-23421 is a medium vulnerability (CVSS 5.6) in Merge-change Project Merge-change, published August 11, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.08%, the 65th percentile. No source names a fixed version.
References
snyk.io/vuln/SNYK-JS-MERGECHANGE-1310985
github.com/VladimirShestakov/merge-change/blob/9901f145e06158f284f52de42e6ba5b0f702fb65/utils.js%23L89-L123
nvd.nist.gov/vuln/detail/CVE-2021-23421