PatchTheCVECVE-2021-23509: This affects the package json-ptr before 3.0.0
CVE-2021-23509 is a medium-severity flaw (CVSS 5.6) affecting json-ptr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
This affects the package json-ptr before 3.0.0. A type confusion vulnerability can lead to a bypass of CVE-2020-7766 when the user-provided keys used in the pointer parameter are arrays.
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.6 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.8% (top 21%) |
| CISA exploited list | No |
| Weakness | CWE-843 |
| Published | 2021-11-03 |
| 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-2021-23509?
json-ptr: upgrade to 3.0.0. Exact commands for each OS are on this page.
Is CVE-2021-23509 being exploited?
CVE-2021-23509 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-2021-23509 affect?
CVE-2021-23509 affects json-ptr. Severity is medium (CVSS 5.6). This affects the package json-ptr before 3.0.0. A type confusion vulnerability can lead to a bypass of CVE-2020-7766 when the user-provided keys used in the pointer parameter are arrays.
How urgent is CVE-2021-23509?
Priority 49/100. Public exploit reference; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2020-7766 HIGH 7.3 UPGRADE This affects all versions of package json-ptr