# CVE-2020-23922: Memory corruption in n/a

> A heap-based buffer over-read in giflib allows attackers to cause denial of service or disclose sensitive memory contents via crafted GIF files.

- **Severity:** High 7.1 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 21 Apr 2021
- **Updated:** 4 Aug 2024
- **Also known as:** CLSA-2026-1781348390, DEBIAN-CVE-2020-23922, ECHO-9ef5-8b3d-9947, GHSA-6xhw-5p38-q4xw, JLSEC-2026-815, ROOT-OS-DEBIAN-12-CVE-2020-23922

## What is CVE-2020-23922?

CVE-2020-23922 is a high-severity memory corruption vulnerability in n/a, published on 21 Apr 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

An issue was discovered in giflib through 5.1.4. DumpScreen2RGB in gif2rgb.c has a heap-based buffer over-read.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2020-23922?

It affects 2 products.


Products: Apache Bookkeeper, Giflib Project Giflib.

## How do I fix CVE-2020-23922?

Upgrade to a fixed version.

## Is CVE-2020-23922 being exploited?

There is no known exploitation of CVE-2020-23922 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2019-17571](https://insights.sbomify.com/CVE-2019-17571/): Deserialization of Untrusted Data in Log4j (critical 9.8)
- [CVE-2017-6891](https://insights.sbomify.com/CVE-2017-6891/): Memory corruption in GnuTLS libtasn1 (high 8.8)
- [CVE-2020-36230](https://insights.sbomify.com/CVE-2020-36230/): A flaw was discovered in OpenLDAP before 2.4.57 leading in an assertion failure in slapd in the X.509 DN parsing in decode.c ber_next_elemen (high 7.5)
- [CVE-2019-19906](https://insights.sbomify.com/CVE-2019-19906/): Memory corruption in n/a (high 7.5)
- [CVE-2022-32531](https://insights.sbomify.com/CVE-2022-32531/): Apache BookKeeper: Java Client Uses Connection to Host that Failed Hostname Verification (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-23922 and fix it if it is affected.

What it is: CVE-2020-23922 is a high-severity memory corruption vulnerability in n/a, published on 21 Apr 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-23922 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-2020-23922/ (Markdown: https://insights.sbomify.com/CVE-2020-23922/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-23922
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-23922
- OSV: https://osv.dev/vulnerability/CVE-2020-23922

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-23922/
Summaries are generated and may contain mistakes; the official description above is the record.