# CVE-2021-32755: Certificate pinning is not enforced on the web socket connection

> Attackers can bypass certificate pinning on WebSocket connections in the Wire iOS app, potentially enabling man-in-the-middle attacks.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jul 2021
- **Updated:** 3 Aug 2024

## What is CVE-2021-32755?

CVE-2021-32755 is a medium-severity vulnerability in wireapp wire-ios-transport, published on 13 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Wire is a collaboration platform. wire-ios-transport handles authentication of requests, network failures, and retries for the iOS implementation of Wire. In the 3.82 version of the iOS application, a new web socket implementation was introduced for users running iOS 13 or higher. This new websocket implementation is not configured to enforce certificate pinning when available. Certificate pinning for the new websocket is enforced in version 3.84 or above.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2021-32755?

It affects 1 product.


Products: Wire Wire.

## How do I fix CVE-2021-32755?

No fix has been published for CVE-2021-32755 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-32755 being exploited?

There is no known exploitation of CVE-2021-32755 in the wild and no public exploit code.

## Other vulnerabilities in wireapp wire-ios-transport

- [CVE-2020-27853](https://insights.sbomify.com/CVE-2020-27853/): Other in n/a (critical 9.8)
- [CVE-2021-32665](https://insights.sbomify.com/CVE-2021-32665/): Verified groups not reliable (high 8.8)
- [CVE-2020-15258](https://insights.sbomify.com/CVE-2020-15258/): Insecure use of shell.openExternal in Wire (high 8.0)
- [CVE-2018-8909](https://insights.sbomify.com/CVE-2018-8909/): Path traversal in n/a (high 7.5)
- [CVE-2021-41093](https://insights.sbomify.com/CVE-2021-41093/): Account takeover when having only access to a user's short lived token (high 7.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32755 and fix it if it is affected.

What it is: CVE-2021-32755 is a medium-severity vulnerability in wireapp wire-ios-transport, published on 13 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-32755 in the wild and no public exploit code.

Affected product: wireapp wire-ios-transport. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-32755/ (Markdown: https://insights.sbomify.com/CVE-2021-32755/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32755
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32755
- OSV: https://osv.dev/vulnerability/CVE-2021-32755

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32755/
Summaries are generated and may contain mistakes; the official description above is the record.