# CVE-2024-23655: Attacker can prevent users from accessing received emails

> An attacker can send a manipulated email that prevents users from accessing their inbox in the Tuta email service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Jan 2024
- **Updated:** 13 Nov 2024
- **Also known as:** GHSA-5h47-g927-629g

## What is CVE-2024-23655?

CVE-2024-23655 is a high-severity denial of service vulnerability in tutao tutanota, published on 25 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Tuta is an encrypted email service. Starting in version 3.118.12 and prior to version 3.119.10, an attacker is able to send a manipulated email so that the user can no longer use the app to get access to received emails. By sending a manipulated email, an attacker could put the app into an unusable state. In this case, a user can no longer access received e-mails. Since the vulnerability affects not only the app, but also the web application, a user in this case has no way to access received emails. This issue was tested with iOS and the web app, but it is possible all clients are affected. Version 3.119.10 fixes this issue.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2024-23655?

It affects 1 product.


Products: Tuta Tutanota.

## How do I fix CVE-2024-23655?

No fix has been published for CVE-2024-23655 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-23655 being exploited?

There is no known exploitation of CVE-2024-23655 in the wild and no public exploit code.

## Other vulnerabilities in tutao tutanota

- [CVE-2023-46116](https://insights.sbomify.com/CVE-2023-46116/): Remote Code Execution via insufficiently sanitized call to shell.openExternal (critical 9.3)
- [CVE-2024-23330](https://insights.sbomify.com/CVE-2024-23330/): Tuta loads images from external resources (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-23655 and fix it if it is affected.

What it is: CVE-2024-23655 is a high-severity denial of service vulnerability in tutao tutanota, published on 25 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-23655 in the wild and no public exploit code.

Affected product: tutao tutanota. 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-2024-23655/ (Markdown: https://insights.sbomify.com/CVE-2024-23655/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-23655
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-23655
- OSV: https://osv.dev/vulnerability/CVE-2024-23655

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-23655/
Summaries are generated and may contain mistakes; the official description above is the record.