Skip to content
Fencer Intel
critical 9.8

CVE-2020-25576 json

Unaligned memory access in rand_core

published 7y ago modified 2mo ago also GHSA-mmc9-pwm7-qj5w , RUSTSEC-2019-0035 , EUVD-2021-1804

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

An issue was discovered in the rand_core crate before 0.4.2 for Rust. Casting of byte slices to integer slices mishandles alignment constraints.

Patch / fix

  • crates.io rand_core 0.3.1, 0.4.2
  • rust-random rand 0.4.2
  • rust-rand-core Debian 14, Debian 13, Debian 12 0.5.0-1

debian advisories DEBIAN-CVE-2020-25576

  • kata-containers Azure Linux 3.0 3.2.0.azl2-3

azure linux advisories AZL-46540

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2020-25576 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

1.60% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
crates.io rand_core
>=0.4.0, <0.4.2
<0.3.1
>=0.0.0-0, <0.3.1
>=0.4.0-0, <0.4.2
0.4.2
0.3.1

Classification

Weakness
  • CWE-704 Incorrect Type Conversion or Cast

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.