# CVE-2020-27539: Memory corruption in n/a

> Heap buffer overflow in the camera's HTTP parser allows code execution, though exploitation requires bypassing default HTTPS-only restrictions.

- **Severity:** Critical 9.8 (`CVSS:3.1/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:** No
- **Published:** 25 Jan 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-75m6-wc48-gvw9

## What is CVE-2020-27539?

CVE-2020-27539 is a critical memory corruption vulnerability in n/a, published on 25 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Heap overflow with full parsing of HTTP respose in Rostelecom CS-C2SHW 5.0.082.1. AgentUpdater service has a self-written HTTP parser and builder. HTTP parser has a heap buffer overflow (OOB write). In default configuration camera parses responses only from HTTPS URLs from config file, so vulnerable code is unreachable and one more bug required to reach it.

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

## Which versions are affected by CVE-2020-27539?

It affects 1 product.


Products: Company Cs-C2shw Firmware.

## How do I fix CVE-2020-27539?

No fix has been published for CVE-2020-27539 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27539 being exploited?

There is no known exploitation of CVE-2020-27539 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-27540](https://insights.sbomify.com/CVE-2020-27540/): Command injection in n/a (critical 9.8)
- [CVE-2020-27541](https://insights.sbomify.com/CVE-2020-27541/): Integer overflow in n/a (high 7.5)
- [CVE-2020-27542](https://insights.sbomify.com/CVE-2020-27542/): Command injection in n/a (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-27539 and fix it if it is affected.

What it is: CVE-2020-27539 is a critical memory corruption vulnerability in n/a, published on 25 Jan 2021. 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-2020-27539 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-2020-27539/ (Markdown: https://insights.sbomify.com/CVE-2020-27539/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27539
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27539
- OSV: https://osv.dev/vulnerability/CVE-2020-27539

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-27539/
Summaries are generated and may contain mistakes; the official description above is the record.