# CVE-2023-5568: Samba: heap buffer overflow with freshness tokens in the heimdal kdc

> A remote authenticated attacker can cause a denial of service via a heap buffer overflow in the Samba Heimdal KDC.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Oct 2023
- **Updated:** 2 Sep 2025
- **Also known as:** AZL-31745, AZL-37029, DEBIAN-CVE-2023-5568, GHSA-x3c8-vcr7-5m4v, ROOT-OS-ALPINE-318-CVE-2023-5568, ROOT-OS-ALPINE-319-CVE-2023-5568, openSUSE-SU-2024:13345-1

## What is CVE-2023-5568?

CVE-2023-5568 is a medium-severity memory corruption vulnerability in Samba Samba, published on 24 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A heap-based Buffer Overflow flaw was discovered in Samba. It could allow a remote, authenticated attacker to exploit this vulnerability to cause a denial of service.

Weakness: CWE-787 (Out-of-bounds Write), CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2023-5568?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `samba` | openSUSE:Tumbleweed | All versions | 4.19.2+git.322.7e9201cef5-1.1 |

Products: Samba Samba.

## How do I fix CVE-2023-5568?

Apply the vendor's patch.

## Is CVE-2023-5568 being exploited?

There is no known exploitation of CVE-2023-5568 in the wild and no public exploit code.

## Other vulnerabilities in Samba Samba

- [CVE-2012-1182](https://insights.sbomify.com/CVE-2012-1182/): Integer overflow in n/a (critical 10.0)
- [CVE-2007-2446](https://insights.sbomify.com/CVE-2007-2446/): Memory corruption in n/a (critical 10.0)
- [CVE-2004-0600](https://insights.sbomify.com/CVE-2004-0600/): Memory corruption in n/a (critical 10.0)
- [CVE-1999-0810](https://insights.sbomify.com/CVE-1999-0810/): Denial of service in n/a (critical 10.0)
- [CVE-1999-0182](https://insights.sbomify.com/CVE-1999-0182/): Memory corruption in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-5568 and fix it if it is affected.

What it is: CVE-2023-5568 is a medium-severity memory corruption vulnerability in Samba Samba, published on 24 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-5568 in the wild and no public exploit code.

Affected product: Samba Samba. 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-2023-5568/ (Markdown: https://insights.sbomify.com/CVE-2023-5568/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-5568
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-5568
- OSV: https://osv.dev/vulnerability/CVE-2023-5568

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-5568/
Summaries are generated and may contain mistakes; the official description above is the record.