What is CVE-2021-3934?

CVE-2021-3934 is a high-severity vulnerability in Ohmyzsh Ohmyzsh/ohmyzsh, classified under OS Command Injection. CVSS score: 7.5/10. Published 2021-11-12.

How severe is CVE-2021-3934?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Ohmyzsh Ohmyzsh/ohmyzsh

CVE-2021-3934

ohmyzsh is vulnerable to Improper Neutralization of Special Elements used in an OS Command

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-11-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.9th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Ohmyzsh Ohmyzsh/ohmyzsh — versions unspecified
Planetargon Oh My Zsh

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

huntr.dev/bounties/ad2b5c3f-a3ce-4407-94dc-354c723310ce (Permissions Required)
github.com/ohmyzsh/ohmyzsh/commit/6cb41b70a6d04301fd50cd5862ecd705ba226c0e (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3934?: CVE-2021-3934 is a high-severity vulnerability in Ohmyzsh Ohmyzsh/ohmyzsh, classified under OS Command Injection. CVSS score: 7.5/10. Published 2021-11-12.
How severe is CVE-2021-3934?: High severity. CVSS v3 base score is 7.5 out of 10.