What’s Vulnerable › Vulnerabilities

CVE-2021-27378

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-18 · updated 2026-06-17
• Weakness: CWE-131

Description

An issue was discovered in the rand_core crate before 0.6.2 for Rust. Because read_u32_into and read_u64_into mishandle certain buffer-length checks, a random number generator may be seeded with too little data.

Affected products

• Rand Core Project Rand Core: from 0.6.0 before 0.6.2 — fixed in 0.6.2

How to fix

Upgrade to a fixed version: Rand Core Project Rand Core 0.6.2. Check the vendor advisory for mitigations.

References

• https://rustsec.org/advisories/RUSTSEC-2021-0023.html
• https://rustsec.org/advisories/RUSTSEC-2021-0023.html

Get alerted when CVE-2021-27378 or the next vulnerability affects your stack