# CVE-2015-1783: Denial of service in n/a

> Remote attackers can cause a denial of service via uninitialized memory access in the Lasso library, requiring a patch to fix.

- **Severity:** High 7.5 (`CVSS:3.0/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:** 11 Aug 2017
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2015-1783, GHSA-h78r-gxwp-4fvm

## What is CVE-2015-1783?

CVE-2015-1783 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 11 Aug 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The prefix variable in the get_or_define_ns function in Lasso before commit 6d854cef4211cdcdbc7446c978f23ab859847cdd allows remote attackers to cause a denial of service (uninitialized memory access and application crash) via unspecified vectors.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2015-1783?

It affects 2 products.


Products: Entrouvert Lasso, Fedoraproject Fedora.

## How do I fix CVE-2015-1783?

Apply the vendor's patch.

## Is CVE-2015-1783 being exploited?

There is no known exploitation of CVE-2015-1783 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2025-47151](https://insights.sbomify.com/CVE-2025-47151/): Memory corruption in Lasso (critical 9.8)
- [CVE-2025-46404](https://insights.sbomify.com/CVE-2025-46404/): Null dereference in Lasso (high 7.5)
- [CVE-2025-46705](https://insights.sbomify.com/CVE-2025-46705/): Denial of service in Lasso (high 7.5)
- [CVE-2025-46784](https://insights.sbomify.com/CVE-2025-46784/): Denial of service in Lasso (high 7.5)
- [CVE-2009-0050](https://insights.sbomify.com/CVE-2009-0050/): Security feature bypass in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-1783 and fix it if it is affected.

What it is: CVE-2015-1783 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 11 Aug 2017. 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-2015-1783 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2015-1783/ (Markdown: https://insights.sbomify.com/CVE-2015-1783/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-1783
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-1783
- OSV: https://osv.dev/vulnerability/CVE-2015-1783

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-1783/
Summaries are generated and may contain mistakes; the official description above is the record.