# CVE-2019-15651: Memory corruption in n/a

> A heap-based buffer over-read in wolfSSL allows attackers to cause denial of service or disclose sensitive information via crafted DER certificates.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 Aug 2019
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2019-15651, GHSA-wgff-2g74-38qq, UBUNTU-CVE-2019-15651

## What is CVE-2019-15651?

CVE-2019-15651 is a critical memory corruption vulnerability in Wolfssl Wolfssl, published on 26 Aug 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

wolfSSL 4.1.0 has a one-byte heap-based buffer over-read in DecodeCertExtensions in wolfcrypt/src/asn.c because reading the ASN_BOOLEAN byte is mishandled for a crafted DER certificate in GetLength_ex.

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

## Which versions are affected by CVE-2019-15651?

It affects 1 product.


Products: Wolfssl Wolfssl.

## How do I fix CVE-2019-15651?

Upgrade to a fixed version.

## Is CVE-2019-15651 being exploited?

There is no known exploitation of CVE-2019-15651 in the wild and no public exploit code.

## Other vulnerabilities in Wolfssl Wolfssl

- [CVE-2024-5991](https://insights.sbomify.com/CVE-2024-5991/): Buffer overread in domain name matching (critical 10.0)
- [CVE-2021-37155](https://insights.sbomify.com/CVE-2021-37155/): Security feature bypass in n/a (critical 9.8)
- [CVE-2020-36177](https://insights.sbomify.com/CVE-2020-36177/): Memory corruption in n/a (critical 9.8)
- [CVE-2014-2896](https://insights.sbomify.com/CVE-2014-2896/): Memory corruption in n/a (critical 9.8)
- [CVE-2014-2897](https://insights.sbomify.com/CVE-2014-2897/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-15651 and fix it if it is affected.

What it is: CVE-2019-15651 is a critical memory corruption vulnerability in Wolfssl Wolfssl, published on 26 Aug 2019. 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-2019-15651 in the wild and no public exploit code.

Affected product: Wolfssl Wolfssl. 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-2019-15651/ (Markdown: https://insights.sbomify.com/CVE-2019-15651/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-15651
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-15651
- OSV: https://osv.dev/vulnerability/CVE-2019-15651

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-15651/
Summaries are generated and may contain mistakes; the official description above is the record.