What is CVE-2021-29300?

CVE-2021-29300 is a critical-severity vulnerability in Ronomon Opened, classified under OS Command Injection. CVSS score: 9.8/10. Published 2021-05-24.

How severe is CVE-2021-29300?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Ronomon Opened

CVE-2021-29300

The @ronomon/opened library before 1.5.2 is vulnerable to a command injection vulnerability which would allow a remote attacker to execute commands on the system if the library was used with untrusted input.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-05-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.045 (91.2th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.045 · newest: 0.045 · change: 0.000

Affected products

Ronomon Opened

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

github.com/ronomon/opened/commit/7effe011d4fea8fac7f78c00615e0a6e69af68ec (Patch, Third Party Advisory)
advisory.checkmarx.net/advisory/CX-2021-4775 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-29300?: CVE-2021-29300 is a critical-severity vulnerability in Ronomon Opened, classified under OS Command Injection. CVSS score: 9.8/10. Published 2021-05-24.
How severe is CVE-2021-29300?: Critical severity. CVSS v3 base score is 9.8 out of 10.