# CVE-2017-5135: Auth bypass in n/a

> Attackers can bypass SNMP authentication on Technicolor devices to read and modify MIB data from the Internet.

- **Severity:** Critical 9.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Apr 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-rpjv-hccg-mhh6

## What is CVE-2017-5135?

CVE-2017-5135 is a critical authentication bypass vulnerability in n/a, published on 27 Apr 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Certain Technicolor devices have an SNMP access-control bypass, possibly involving an ISP customization in some cases. The Technicolor (formerly Cisco) DPC3928SL with firmware D3928SL-P15-13-A386-c3420r55105-160127a could be reached by any SNMP community string from the Internet; also, you can write in the MIB because it provides write properties, aka Stringbleed. NOTE: the string-bleed/StringBleed-CVE-2017-5135 GitHub repository is not a valid reference as of 2017-04-27; it contains Trojan horse code purported to exploit this vulnerability.

## Which versions are affected by CVE-2017-5135?

It affects 1 product.


Products: Technicolor Dpc3928sl Firmware.

## How do I fix CVE-2017-5135?

No fix has been published for CVE-2017-5135 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-5135 being exploited?

There is no known exploitation of CVE-2017-5135 in the wild and no public exploit code.

Public exploit code:

- Technicolor DPC3928SL - SNMP Authentication Bypass (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2018-20439](https://insights.sbomify.com/CVE-2018-20439/): Information disclosure in n/a (critical 9.8)
- [CVE-2018-20379](https://insights.sbomify.com/CVE-2018-20379/): Cross-site scripting in n/a (medium 4.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-5135 and fix it if it is affected.

What it is: CVE-2017-5135 is a critical authentication bypass vulnerability in n/a, published on 27 Apr 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-2017-5135 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-2017-5135/ (Markdown: https://insights.sbomify.com/CVE-2017-5135/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-5135
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-5135
- OSV: https://osv.dev/vulnerability/CVE-2017-5135

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-5135/
Summaries are generated and may contain mistakes; the official description above is the record.