# CVE-2020-23566: Denial of service in n/a

> An attacker can cause a denial of service in Irfanview by triggering an infinite loop via a malicious JPEG2000 file.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Nov 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-vc8p-98q7-88hp

## What is CVE-2020-23566?

CVE-2020-23566 is a medium-severity denial of service vulnerability in Irfanview Irfanview, published on 5 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Irfanview v4.53 was discovered to contain an infinity loop via JPEG2000!ShowPlugInSaveOptions_W+0x1ecd8.

Weakness: CWE-835 (Loop with Unreachable Exit Condition)

## Which versions are affected by CVE-2020-23566?

It affects 1 product.


Products: Irfanview Irfanview.

## How do I fix CVE-2020-23566?

No fix has been published for CVE-2020-23566 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-23566 being exploited?

There is no known exploitation of CVE-2020-23566 in the wild and no public exploit code.

## Other vulnerabilities in Irfanview Irfanview

- [CVE-2007-1867](https://insights.sbomify.com/CVE-2007-1867/): Memory corruption in n/a (critical 10.0)
- [CVE-2008-0493](https://insights.sbomify.com/CVE-2008-0493/): Memory corruption in n/a (critical 9.3)
- [CVE-2007-1948](https://insights.sbomify.com/CVE-2007-1948/): Memory corruption in n/a (critical 9.3)
- [CVE-2020-13905](https://insights.sbomify.com/CVE-2020-13905/): Memory corruption in n/a (high 8.8)
- [CVE-2017-2813](https://insights.sbomify.com/CVE-2017-2813/): Integer overflow in Irfanview (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-23566 and fix it if it is affected.

What it is: CVE-2020-23566 is a medium-severity denial of service vulnerability in Irfanview Irfanview, published on 5 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-23566 in the wild and no public exploit code.

Affected product: Irfanview Irfanview. 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-2020-23566/ (Markdown: https://insights.sbomify.com/CVE-2020-23566/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-23566
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-23566
- OSV: https://osv.dev/vulnerability/CVE-2020-23566

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-23566/
Summaries are generated and may contain mistakes; the official description above is the record.