# CVE-2022-27924: Synacor Zimbra Collaboration Suite (ZCS) Command Injection

> Unauthenticated attackers can inject memcache commands to overwrite cached entries in Zimbra Collaboration.

- **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:** Yes, since 4 Aug 2022 (CISA KEV), used in ransomware
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Apr 2022
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-763p-5rx7-r4qf

## What is CVE-2022-27924?

CVE-2022-27924 is a critical vulnerability in Synacor Zimbra Collaboration Suite, published on 20 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 allows an unauthenticated attacker to inject arbitrary memcache commands into a targeted instance. These memcache commands becomes unescaped, causing an overwrite of arbitrary cached entries.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2022-27924?

It affects 1 product.


Products: Synacor Zimbra Collaboration Suite.

## How do I fix CVE-2022-27924?

No fix has been published for CVE-2022-27924 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 25 Aug 2022.

## Is CVE-2022-27924 being exploited?

Yes. Attackers have exploited CVE-2022-27924 in the wild since at least 4 Aug 2022, including in ransomware campaigns.

Public exploit code:

- Zimbra Collaboration Suite - Memcached Command Injection (nuclei): http/cves/2022/CVE-2022-27924.yaml

## Other vulnerabilities in Synacor Zimbra Collaboration Suite

- [CVE-2024-45519](https://insights.sbomify.com/CVE-2024-45519/): Synacor Zimbra Collaboration Suite (ZCS) Command Execution (critical 10.0, exploited in the wild)
- [CVE-2022-41352](https://insights.sbomify.com/CVE-2022-41352/): Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload (critical 9.8, exploited in the wild)
- [CVE-2022-37042](https://insights.sbomify.com/CVE-2022-37042/): Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7796](https://insights.sbomify.com/CVE-2020-7796/): Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (critical 9.8, exploited in the wild)
- [CVE-2019-9670](https://insights.sbomify.com/CVE-2019-9670/): Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-27924 and fix it if it is affected.

What it is: CVE-2022-27924 is a critical vulnerability in Synacor Zimbra Collaboration Suite, published on 20 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2022-27924 in the wild since at least 4 Aug 2022, including in ransomware campaigns.

Affected product: Synacor Zimbra Collaboration Suite. 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-2022-27924/ (Markdown: https://insights.sbomify.com/CVE-2022-27924/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-27924
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-27924
- OSV: https://osv.dev/vulnerability/CVE-2022-27924

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From sbomify Insights: https://insights.sbomify.com/CVE-2022-27924/
Summaries are generated and may contain mistakes; the official description above is the record.