# CVE-2021-27847: Denial of service in n/a

> A division-by-zero error in Libvips allows attackers to cause a denial of service via crafted image inputs.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 15 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-27847, GHSA-78wm-7588-c232, UBUNTU-CVE-2021-27847

## What is CVE-2021-27847?

CVE-2021-27847 is a medium-severity denial of service vulnerability in n/a, published on 15 Jul 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Division-By-Zero vulnerability in Libvips 8.10.5 in the function vips_eye_point, eye.c#L83, and function vips_mask_point, mask.c#L85.

Weakness: CWE-369 (Divide By Zero)

## Which versions are affected by CVE-2021-27847?

It affects 1 product.


Products: Libvips Libvips.

## How do I fix CVE-2021-27847?

Upgrade to a fixed version.

## Is CVE-2021-27847 being exploited?

There is no known exploitation of CVE-2021-27847 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2019-17534](https://insights.sbomify.com/CVE-2019-17534/): Use after free in n/a (high 8.8)
- [CVE-2026-33327](https://insights.sbomify.com/CVE-2026-33327/): Possible integer overflow leading to potential heap-based buffer overflow (high 7.0)
- [CVE-2026-35591](https://insights.sbomify.com/CVE-2026-35591/): Possible heap-based buffer overflow when decoding TIFF image containing well-crafted tile (high 7.0)
- [CVE-2026-33328](https://insights.sbomify.com/CVE-2026-33328/): Possible integer overflow on 32-bit systems when reading GIF images (medium 6.8)
- [CVE-2026-35590](https://insights.sbomify.com/CVE-2026-35590/): Possible out-of-bounds read leading to crash when decoding well-crafted EXIF metadata (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27847 and fix it if it is affected.

What it is: CVE-2021-27847 is a medium-severity denial of service vulnerability in n/a, published on 15 Jul 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-27847 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-2021-27847/ (Markdown: https://insights.sbomify.com/CVE-2021-27847/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27847
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27847
- OSV: https://osv.dev/vulnerability/CVE-2021-27847

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-27847/
Summaries are generated and may contain mistakes; the official description above is the record.