Vulnerability Database · crates.io · rustls · Version
rustls 0.21.2
0.21.2 is affected by 3 vulnerabilities.
The vulnerabilities that cover this exact version are listed below with the fixed version to move to. The upgrade Vulert recommends: 0.23.46.
Critical 0 High 1 Medium 1 Low 1 Unrated 0
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Released 14 Jun 2023
Licence Apache-2.0 OR ISC OR MIT
Also known from other sources 4
Newer releases 118
Database updated 23/Oct/2026
Release and licence data published by crates.io. Licence information is not legal advice.
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01 Vulnerabilities affecting this version
rustls 0.21.2 vulnerabilities
3 vulnerabilities cover rustls 0.21.2. Open the full list in the database.
| Vulnerability | Severity | Fixed version | Disclosed |
|---|---|---|---|
| Infinite Loop Vulnerability in rustls | 7.5 high | 0.21.11 | 19 Apr 2024 |
| Exposed TLS Secrets in rustls Package: Debug Implementations Vulnerability | 4.0 medium | 0.23.46 | 14 Oct 2026 |
| Downgrade Vulnerability in rustls: Unauthenticated ServerHello Allows Classical Key Exchange | 3.7 low | 0.23.46 | 14 Oct 2026 |
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Questions
About rustls 0.21.2
Is rustls 0.21.2 vulnerable?
Yes. 3 vulnerabilities in the Vulert database cover rustls 0.21.2: 0 critical, 1 high, 1 medium and 1 low. The upgrade Vulert recommends is 0.23.46, and each entry above names the fixed version to move to.
Which version of rustls should I use instead of 0.21.2?
0.23.46 is the version Vulert recommends for this release line. The version table on the package page lists every release with the vulnerabilities recorded against it.
Is 0.21.2 the latest release of rustls?
No. 0.21.2 was published 14 Jun 2023, and newer releases exist. Newer is not automatically safer — the version table on the package page shows what each release carries.
How do I monitor rustls for upcoming vulnerabilities?
Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the rustls version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.