# CVE-2021-31292: Integer overflow in n/a

> Attackers can cause a denial of service via heap-based buffer overflow triggered by integer overflow in Exiv2 when processing crafted metadata.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** Yes
- **Published:** 26 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-31292, GHSA-6558-x489-9qhw, PYSEC-2021-877

## What is CVE-2021-31292?

CVE-2021-31292 is a high-severity vulnerability in Debian Debian Linux, published on 26 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An integer overflow in CrwMap::encode0x1810 of Exiv2 0.27.3 allows attackers to trigger a heap-based buffer overflow and cause a denial of service (DOS) via crafted metadata.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2021-31292?

1 open source package ship an affected version, including exiv2. It affects 3 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `exiv2` | PyPI | All versions | None |

Products: Debian Debian Linux, Exiv2 Exiv2, Fedoraproject Fedora.

## How do I fix CVE-2021-31292?

Upgrade to a fixed version.

## Is CVE-2021-31292 being exploited?

There is no known exploitation of CVE-2021-31292 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31292 and fix it if it is affected.

What it is: CVE-2021-31292 is a high-severity vulnerability in Debian Debian Linux, published on 26 Jul 2021. 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-2021-31292 in the wild and no public exploit code.

Affected packages and fixed versions:
- exiv2 (PyPI): affected all versions; no fix listed

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-2021-31292/ (Markdown: https://insights.sbomify.com/CVE-2021-31292/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31292
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31292
- OSV: https://osv.dev/vulnerability/CVE-2021-31292

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-31292/
Summaries are generated and may contain mistakes; the official description above is the record.