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CVE-2020-25576

29
FAUCET Score

CVE-2020-25576 is a critical vulnerability affecting the rand_core crate before version 0.4.2 in Rust, specifically due to improper handling of alignment constraints when casting byte slices to integer slices. With a CVSS score of 9.8, this network-exploitable flaw allows for high impact to confidentiality, integrity, and availability without requiring user interaction or elevated privileges. Despite its severity, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.4.2CPE matchmatch criteria
cpe:2.3:a:rand_project:rand:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.56%
Probability of exploitation in next 30 days
EPSS Percentile
72.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0156 is in the 60th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

microsoftpatch availablevia msrc
Product: azl3 kata-containers 3.2.0.azl2-3 on Azure Linux 3.0Fixed in: 3.2.0.azl2-3
microsoftpatch availablevia msrc
Product: 17679-17084Fixed in: 3.2.0.azl2-3
microsoftpatch availablevia msrc
Product: azl3 kata-containers 3.1.3-2 on Azure Linux 3.0Fixed in: 3.2.0.azl2-3
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 x64Fixed in: 3.2.0.azl2-3
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 ARMFixed in: 3.2.0.azl2-3
microsoftpatch availablevia msrc
Product: 19706-17084Fixed in: 3.2.0.azl2-3
rustpatch availablevia ghsa
Product: rand_coreFixed in: 0.3.1
rustpatch availablevia ghsa
Product: rand_coreFixed in: 0.4.2

Vendor Advisories (3)

microsoft2024-Sep/CVE-2020-25576

CVE-2020-25576

Sep 10, 2024
rustGHSA-mmc9-pwm7-qj5wcritical

Unaligned memory access in rand_core

Aug 25, 2021
microsoft2020-Sep/CVE-2020-25576Critical

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.

Sep 8, 2020

References

rustsec.org / advisories/RUSTSEC-2019-0035.html
Vendor Advisory