What is CVE-2021-4245?

CVE-2021-4245 is a medium-severity vulnerability in Chbrown Rfc6902, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.5/10. Published 2022-12-15.

How severe is CVE-2021-4245?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Prototype Pollution in Chbrown Rfc6902

CVE-2021-4245

A vulnerability classified as problematic has been found in chbrown rfc6902. This affects an unknown part of the file pointer.ts. The manipulation leads to improperly controlled modification of object prototype attributes ('prototype pollution'). The exploit has been disclosed to the public and may be used. The name of the patch is c006ce9faa43d31edb34924f1df7b79c137096cf. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-215883.

Published 2022-12-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.013 (69.4th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: +0.000

Affected products

Weakness classification (CWE)

References

github.com/chbrown/rfc6902/pull/76 (Exploit, Patch, Third Party Advisory)
github.com/chbrown/rfc6902/commit/c006ce9faa43d31edb34924f1df7b79c137096cf (Patch, Third Party Advisory)
vuldb.com/ (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2021-4245?: CVE-2021-4245 is a medium-severity vulnerability in Chbrown Rfc6902, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.5/10. Published 2022-12-15.
How severe is CVE-2021-4245?: Medium severity. CVSS v3 base score is 5.5 out of 10.