# CVE-2021-3345: Memory corruption in n/a

> A heap-based buffer overflow in Libgcrypt allows attackers to execute arbitrary code or cause denial of service via crafted digest final functions.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:** Yes
- **Published:** 29 Jan 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-pf53-rq8f-rwqx

## What is CVE-2021-3345?

CVE-2021-3345 is a high-severity memory corruption vulnerability in Oracle Communications Billing and Revenue Management, published on 29 Jan 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

_gcry_md_block_write in cipher/hash-common.c in Libgcrypt version 1.9.0 has a heap-based buffer overflow when the digest final function sets a large count value. It is recommended to upgrade to 1.9.1 or later.

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

## Which versions are affected by CVE-2021-3345?

It affects 2 products.


Products: Gnupg Libgcrypt, Oracle Communications Billing and Revenue Management.

## How do I fix CVE-2021-3345?

Upgrade to a fixed version.

## Is CVE-2021-3345 being exploited?

There is no known exploitation of CVE-2021-3345 in the wild and no public exploit code.

Public exploit code:

- POC exploit of CVE-2021-3345, a vulnerability in libgcrypt version 1.9.0 (github_poc): https://github.com/MLGRadish/CVE-2021-3345
- Actual working exploit for CVE-2021-3345 (github_poc): https://github.com/SpiralBL0CK/CVE-2021-3345

## Other vulnerabilities in Oracle Communications Billing and Revenue Management

- [CVE-2018-6829](https://insights.sbomify.com/CVE-2018-6829/): Weak cryptography in n/a (high 7.5)
- [CVE-2026-41989](https://insights.sbomify.com/CVE-2026-41989/): Memory corruption in Libgcrypt (medium 6.7)
- [CVE-2021-40528](https://insights.sbomify.com/CVE-2021-40528/): Weak cryptography in n/a (medium 5.9)
- [CVE-2019-12904](https://insights.sbomify.com/CVE-2019-12904/): Information disclosure in n/a (medium 5.9)
- [CVE-2017-9526](https://insights.sbomify.com/CVE-2017-9526/): Information disclosure in n/a (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3345 and fix it if it is affected.

What it is: CVE-2021-3345 is a high-severity memory corruption vulnerability in Oracle Communications Billing and Revenue Management, published on 29 Jan 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-2021-3345 in the wild and no public exploit code.

Affected product: Oracle Communications Billing and Revenue Management. 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-2021-3345/ (Markdown: https://insights.sbomify.com/CVE-2021-3345/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3345
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3345
- OSV: https://osv.dev/vulnerability/CVE-2021-3345

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-3345/
Summaries are generated and may contain mistakes; the official description above is the record.