CVE-2021-25953
Prototype Pollution in putil-merge
Prototype pollution vulnerability in 'putil-merge' versions1.0.0 through 3.6.6 allows attacker to cause a denial of service and may lead to remote code execution.
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
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Prototype pollution vulnerability in 'putil-merge' versions1.0.0 through 3.6.6 allows attacker to cause a denial of service and may lead to remote code execution.
- Record
CVE-2021-25953- 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
CVE List No score
Prototype pollution vulnerability in 'putil-merge' versions1.0.0 through 3.6.6 allows attacker to cause a denial of service and may lead to remote code execution.
- Record
CVE-2021-25953- Updated
- 2026-11-02
EUVDEUVD-2021-2500 No score
Prototype pollution vulnerability in 'putil-merge' versions1.0.0 through 3.6.6 allows attacker to cause a denial of service and may lead to remote code execution.
- Record
EUVD-2021-2500- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-9x7m-9hpg-xxmw
Prototype Pollution in putil-merge
Prototype pollution vulnerability in 'putil-merge' versions1.0.0 through 3.6.6 allows attacker to cause a denial of service and may lead to remote code execution.
- Record
GHSA-9x7m-9hpg-xxmw- 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-1321
- Updated
- 2026-11-02
OSVGHSA-9x7m-9hpg-xxmw
Prototype Pollution in putil-merge
Prototype pollution vulnerability in 'putil-merge' versions1.0.0 through 3.6.6 allows attacker to cause a denial of service and may lead to remote code execution.
- Record
GHSA-9x7m-9hpg-xxmw- 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-1321
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
putil-mergenpm |
1.0.0 to 3.6.6 | 3.7.0 |
putil-mergenpm |
1.0.0 up to 3.7.0 | 3.7.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| 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-2021-25953 is a critical vulnerability (CVSS 9.8) in Putil-merge Project Putil-merge, published July 14, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.96%, the 87th percentile. Fixed in putil-merge 3.7.0.