# CVE-2020-27853: Other in n/a

> Remote attackers can cause application crashes or execute arbitrary code via a format string vulnerability in the Wire Secure Messenger application.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 27 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-72jw-4jcq-xh9j

## What is CVE-2020-27853?

CVE-2020-27853 is a critical vulnerability in n/a, published on 27 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Wire before 2020-10-16 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a format string. This affects Wire AVS (Audio, Video, and Signaling) 5.3 through 6.x before 6.4, the Wire Secure Messenger application before 3.49.918 for Android, and the Wire Secure Messenger application before 3.61 for iOS. This occurs via the value parameter to sdp_media_set_lattr in peerflow/sdp.c.

Weakness: CWE-134 (Use of Externally-Controlled Format String)

## Which versions are affected by CVE-2020-27853?

It affects 3 products.


Products: Wire Wire, Wire Wire - Audio\, Video\, and Signaling, Wire Wire Secure Messenger.

## How do I fix CVE-2020-27853?

No fix has been published for CVE-2020-27853 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27853 being exploited?

There is no known exploitation of CVE-2020-27853 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [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)
- [CVE-2023-22737](https://insights.sbomify.com/CVE-2023-22737/): wire-server vulnerable to unauthorized removal of Bots from Conversations (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-27853 and fix it if it is affected.

What it is: CVE-2020-27853 is a critical vulnerability in n/a, published on 27 Oct 2020. 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-2020-27853 in the wild and no public exploit code.

Affected product: n/a. 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-2020-27853/ (Markdown: https://insights.sbomify.com/CVE-2020-27853/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27853
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27853
- OSV: https://osv.dev/vulnerability/CVE-2020-27853

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-27853/
Summaries are generated and may contain mistakes; the official description above is the record.