# CVE-2025-64393: Deserialization in Backup and Replication

> A Backup Viewer can execute arbitrary code as SYSTEM on the Veeam Backup & Replication server due to unsafe deserialization.

- **Severity:** Critical 9.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **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:** 7 Oct 2026
- **Updated:** 8 Oct 2026
- **Also known as:** GHSA-6m95-66x2-x5hx

## What is CVE-2025-64393?

CVE-2025-64393 is a critical unsafe deserialization vulnerability in Veeam Backup and Replication, published on 7 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

This vulnerability in Veeam Backup & Replication allows a Backup Viewer to execute arbitrary code as SYSTEM on the backup server.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2025-64393?


## How do I fix CVE-2025-64393?

No fix has been published for CVE-2025-64393 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-64393 being exploited?

There is no known exploitation of CVE-2025-64393 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-64393 and fix it if it is affected.

What it is: CVE-2025-64393 is a critical unsafe deserialization vulnerability in Veeam Backup and Replication, published on 7 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-64393 in the wild and no public exploit code.

Affected product: Veeam Backup and Replication. 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-2025-64393/ (Markdown: https://insights.sbomify.com/CVE-2025-64393/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-64393
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-64393
- OSV: https://osv.dev/vulnerability/CVE-2025-64393

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-64393/
Summaries are generated and may contain mistakes; the official description above is the record.