CVE-2021-3645 json
Prototype Pollution in viking04/merge
published 5y ago modified 4mo ago also GHSA-cqqh-49mx-fq63 , EUVD-2021-2043
- cvss
- 6.8
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.4%
- EPSS 1.4% chance of exploitation in 30 days, percentile 73%
- public exploits
- 0
- none known
Summary
merge is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Patch / fix
Is CVE-2021-3645 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
1.43% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- huntr.dev https://huntr.dev/bounties/ef387a9e-ca3c-4c21-80e3-d34a6a896262 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 6.8 | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @viking04/merge | <1.0.2 |
1.0.2 |
Affected products
- viking04 viking04/merge
Classification
References
-
github.com
/viking04/merge/commit/baba40332080b38b33840d2614df6d4142dedaf6
web, patch, third-party-advisory
-
huntr.dev
/bounties/ef387a9e-ca3c-4c21-80e3-d34a6a896262
web, exploit, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-3645
advisory
-
github.com
/viking04/merge
package
Sources
- CVE List CVE-2021-3645
- GitHub Advisory GHSA-cqqh-49mx-fq63
- NVD CVE-2021-3645
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.