CVE-2021-4245: A vulnerability classified as problematic has been found in chbrown rfc6902

Q: How do I fix CVE-2021-4245?

rfc6902: upgrade to 5.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-4245 being exploited?

CVE-2021-4245 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-4245 affect?

CVE-2021-4245 affects rfc6902. Severity is medium (CVSS 5.5). 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 pollut

Q: How urgent is CVE-2021-4245?

Priority 42/100. Public exploit reference

This month

MEDIUM 5.5UPGRADE

CVE-2021-4245 is a medium-severity flaw (CVSS 5.5) affecting rfc6902. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ident

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.4% (top 29%)
CISA exploited list	No
Weakness	CWE-74, CWE-1321
Published	2022-12-15
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: rfc6902 project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-12-15 20:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

rfc6902 project rfc6902 UPGRADE

Affected: < 5.0.0

Fixed in: 5.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy rfc6902 || rpm -q rfc6902 || rfc6902 --version

2. UPGRADE to 5.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rfc6902

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rfc6902

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2021-4245?

rfc6902: upgrade to 5.0.0. Exact commands for each OS are on this page.

Is CVE-2021-4245 being exploited?

CVE-2021-4245 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-2021-4245 affect?

CVE-2021-4245 affects rfc6902. Severity is medium (CVSS 5.5). 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 pollut

How urgent is CVE-2021-4245?

Priority 42/100. Public exploit reference

References

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