CVE-2021-45709 — Vulnerability in crypto2 — CVE Details
CRITICAL
Use of a Broken or Risky Cryptographic Algorithm in crypto2
Published January 6, 2022Updated November 8, 2023Source: osv
Summary
The implementation does not enforce alignment requirements on input slices while incorrectly assuming 4-byte alignment through an unsafe call to std::slice::from_raw_parts_mut, which breaks the contract and introduces undefined behavior.
This affects Chacha20 encryption and decryption in crypto2.
Advisory Timeline
- First published January 6, 2022 (1740 days ago).
- Last revised November 8, 2023 — 670 days after initial publication.
Affected Packages (1)
Affects 1 ecosystem: crates.io (1).
| Package | Ecosystem | Affected | Fixed In |
|---|---|---|---|
| crypto2 | crates.io | All versions | Range-based data available |
Vulnerability Classification
Common Weakness Enumeration (CWE) identifiers for this vulnerability type.
- CWE-119Buffer OverflowMITRE
CVSS Score Breakdown
What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-45709ADVISORY
- https://github.com/shadowsocks/crypto2/issues/27WEB
- https://github.com/shadowsocks/crypto2PACKAGE
- https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/crypto2/RUSTSEC-2021-0121.mdWEB
- https://rustsec.org/advisories/RUSTSEC-2021-0121.htmlWEB
Frequently Asked Questions
- What is CVE-2021-45709?
- Use of a Broken or Risky Cryptographic Algorithm in crypto2 This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
- How do I check if my project is affected by CVE-2021-45709?
- CVE-2021-45709 affects crypto2. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-45709 and 200,000+ other known vulnerabilities.
Severity & Exploitability
CVSS Score
9.8
Exploitation is straightforward and causes maximum impact. Patch immediately.
Also Known As
GHSA-9hfg-pxr6-q4vp
GHSA-pmcv-mgcf-rvxg
RUSTSEC-2021-0121
Related CVEs
- RUSTSEC-2026-0327CRITICAL
Wasmtime component async-lifted callback result count is unvalidated, causing a native stack buffer overflow
- CVE-2026-75856CRITICAL
CodeWhale: SSRF bypass - TOCTOU on DNS failure for DNS pinning
Check if you're affected
Scan your dependencies to see if this vulnerability affects your projects.
Scan Your Dependencies