# CVE-2022-28734: Out-of-bounds write when handling split HTTP headers

> An out-of-bounds write in GRUB2's HTTP header handling allows attackers to corrupt memory and potentially execute code or escalate privileges.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:H/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:** Yes
- **Published:** 20 Jul 2023
- **Updated:** 13 Feb 2025
- **Also known as:** AZL-27552, AZL-34789, DEBIAN-CVE-2022-28734, GHSA-h8v2-pvw7-3jf5, UBUNTU-CVE-2022-28734

## What is CVE-2022-28734?

CVE-2022-28734 is a high-severity memory corruption vulnerability in Netapp Active Iq Unified Manager, published on 20 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Out-of-bounds write when handling split HTTP headers; When handling split HTTP headers, GRUB2 HTTP code accidentally moves its internal data buffer point by one position. This can lead to a out-of-bound write further when parsing the HTTP request, writing a NULL byte past the buffer. It's conceivable that an attacker controlled set of packets can lead to corruption of the GRUB2's internal memory metadata.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2022-28734?

It affects 2 products.


Products: Gnu Grub2, Netapp Active Iq Unified Manager.

## How do I fix CVE-2022-28734?

Apply the vendor's patch.

## Is CVE-2022-28734 being exploited?

There is no known exploitation of CVE-2022-28734 in the wild and no public exploit code.

## Other vulnerabilities in Netapp Active Iq Unified Manager

- [CVE-2024-56737](https://insights.sbomify.com/CVE-2024-56737/): Memory corruption in GRUB2 (high 8.8)
- [CVE-2022-28733](https://insights.sbomify.com/CVE-2022-28733/): Integer underflow in grub_net_recv_ip4_packets (high 8.1)
- [CVE-2025-61662](https://insights.sbomify.com/CVE-2025-61662/): Grub2: missing unregister call for gettext command may lead to use-after-free (high 7.8)
- [CVE-2024-45782](https://insights.sbomify.com/CVE-2024-45782/): Grub2: fs/hfs: strcpy() using the volume name (fs/hfs.c:382) (high 7.8)
- [CVE-2025-0678](https://insights.sbomify.com/CVE-2025-0678/): Grub2: squash4: integer overflow may lead to heap based out-of-bounds write when reading data (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-28734 and fix it if it is affected.

What it is: CVE-2022-28734 is a high-severity memory corruption vulnerability in Netapp Active Iq Unified Manager, published on 20 Jul 2023. 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-2022-28734 in the wild and no public exploit code.

Affected product: Netapp Active Iq Unified Manager. 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-2022-28734/ (Markdown: https://insights.sbomify.com/CVE-2022-28734/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-28734
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-28734
- OSV: https://osv.dev/vulnerability/CVE-2022-28734

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-28734/
Summaries are generated and may contain mistakes; the official description above is the record.