PatchTheCVECVE-2020-8125: Flaw in input validation in npm package klona version 1.1.0 and earlier may allow prototype pollution attack t
CVE-2020-8125 is a critical-severity flaw (CVSS 9.8) affecting klona. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Flaw in input validation in npm package klona version 1.1.0 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using klona.
Why this priority
- Critical severity
- EPSS top 9%: very likely to be exploited
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 4.1% (top 9%) |
| CISA exploited list | No |
| Weakness | CWE-20 |
| Published | 2020-02-04 |
| 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-2020-8125?
klona: upgrade to newer than 1.1.0. Exact commands for each OS are on this page.
Is CVE-2020-8125 being exploited?
CVE-2020-8125 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-2020-8125 affect?
CVE-2020-8125 affects klona. Severity is critical (CVSS 9.8). Flaw in input validation in npm package klona version 1.1.0 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using klona.
How urgent is CVE-2020-8125?
Priority 67/100. Critical severity; EPSS top 9%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action