CVE catalog

CVE-2020-25576

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.

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Sep 14, 2020, 7:15:00 PM UTC
Updated: Aug 19, 2026, 7:21:55 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.60% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	rust-rand-core	sid	`0.10.1-1`	fixed
Debian	rust-rand-core	forky	`0.10.1-1`	fixed
Debian	rust-rand-core	trixie	`0.6.4-2`	fixed
Debian	rust-rand-core	bookworm	`0.6.3-2`	fixed
Cpe	rand	Not reported	`0.4.2`	fixed
Ubuntu	rust-rand-core-0.2	20.04	`0.2.2-1`	vulnerable
Ubuntu	rust-rand-core-0.2	20.04	`0.2.2-2`	vulnerable
Ubuntu	rust-rand-core-0.3	20.04	`0.3.0-1`	vulnerable
Ubuntu	rust-rand-core-0.3	20.04	`0.3.0-2`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	rust-rand-core	source	sid	`0.5.0-1`	low	Not reported	[969911]
Debian	rust-rand-core	source	forky	`0.5.0-1`	low	Not reported	[969911]
Debian	rust-rand-core	source	trixie	`0.5.0-1`	low	Not reported	[969911]
Debian	rust-rand-core	source	bookworm	`0.5.0-1`	low	Not reported	[969911]
Cpe	rand	cpe	Not reported	`0.4.2`	Not reported	NVD-CVE-2020-25576	Not reported

[Debian bug #969911]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[librust-rand-core-dev]Fixed
Source package: [rust-rand-core]
Details (2)
- 0.6.3-2 · amd64 · bookworm
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · bookworm; nvd · rust-rand-core · debian · 12
- 0.6.3-2 · arm64 · bookworm
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · bookworm; nvd · rust-rand-core · debian · 12
[librust-rand-core+getrandom-dev]Fixed
Source package: [rust-rand-core]
Details (2)
- 0.6.3-2 · amd64 · bookworm
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · bookworm; nvd · rust-rand-core · debian · 12
- 0.6.3-2 · arm64 · bookworm
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · bookworm; nvd · rust-rand-core · debian · 12
[librust-rand-core+serde-dev]Fixed
Source package: [rust-rand-core]
Details (2)
- 0.6.3-2 · amd64 · bookworm
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · bookworm; nvd · rust-rand-core · debian · 12
- 0.6.3-2 · arm64 · bookworm
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · bookworm; nvd · rust-rand-core · debian · 12
[librust-rand-core+std-dev]Fixed
Source package: [rust-rand-core]
Details (2)
- 0.6.3-2 · amd64 · bookworm
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · bookworm; nvd · rust-rand-core · debian · 12
- 0.6.3-2 · arm64 · bookworm
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · bookworm; nvd · rust-rand-core · debian · 12

[Debian 13 (Trixie)]

[librust-rand-core-dev]Fixed
Source package: [rust-rand-core]
Details (2)
- 0.6.4-2 · amd64 · trixie
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · 13
- 0.6.4-2 · arm64 · trixie
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · 13
[librust-rand-core+getrandom-dev]Fixed
Source package: [rust-rand-core]
Details (2)
- 0.6.4-2 · amd64 · trixie
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · 13
- 0.6.4-2 · arm64 · trixie
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · 13
[librust-rand-core+serde-dev]Fixed
Source package: [rust-rand-core]
Details (2)
- 0.6.4-2 · amd64 · trixie
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · 13
- 0.6.4-2 · arm64 · trixie
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · 13
[librust-rand-core+std-dev]Fixed
Source package: [rust-rand-core]
Details (2)
- 0.6.4-2 · amd64 · trixie
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · 13
- 0.6.4-2 · arm64 · trixie
  Fixed · Fixed: 0.5.0-1
  nvd · rust-rand-core · debian · 13

Observed: Oct 23, 2026, 5:49:27 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]