PatchTheCVECVE-2021-23421: All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
CVE-2021-23421 is a medium-severity flaw (CVSS 5.6) affecting merge-change. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 5.6 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 35%) |
| CISA exploited list | No |
| Weakness | CWE-1321 |
| Published | 2021-08-11 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-23421?
merge-change: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-23421 being exploited?
CVE-2021-23421 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-23421 affect?
CVE-2021-23421 affects merge-change. Severity is medium (CVSS 5.6). All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.
How urgent is CVE-2021-23421?
Priority 46/100. Public exploit reference; Remotely exploitable, no login, no user action