# CVE-2015-7755: Juniper ScreenOS Improper Authentication

> Remote attackers can gain administrative access to Juniper ScreenOS devices via SSH or Telnet using an unspecified password.

- **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:** Yes, since 2 Oct 2025 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Dec 2015
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-43vr-5w6h-pr3g

## What is CVE-2015-7755?

CVE-2015-7755 is a critical authentication bypass vulnerability in n/a, published on 19 Dec 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Juniper ScreenOS 6.2.0r15 through 6.2.0r18, 6.3.0r12 before 6.3.0r12b, 6.3.0r13 before 6.3.0r13b, 6.3.0r14 before 6.3.0r14b, 6.3.0r15 before 6.3.0r15b, 6.3.0r16 before 6.3.0r16b, 6.3.0r17 before 6.3.0r17b, 6.3.0r18 before 6.3.0r18b, 6.3.0r19 before 6.3.0r19b, and 6.3.0r20 before 6.3.0r21 allows remote attackers to obtain administrative access by entering an unspecified password during a (1) SSH or (2) TELNET session.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2015-7755?

It affects 1 product.


Products: Juniper Screenos.

## How do I fix CVE-2015-7755?

No fix has been published for CVE-2015-7755 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 23 Oct 2025.

## Is CVE-2015-7755 being exploited?

Yes. Attackers have exploited CVE-2015-7755 in the wild since at least 2 Oct 2025.

Public exploit code:

- Notes, binaries, and related information from analysis of the CVE-2015-7755 & CVE-2015-7756 issues within Juniper ScreenOS (github_poc): https://github.com/hdm/juniper-cve-2015-7755
- https://github.com/cinno/CVE-2015-7755-POC (github_poc): https://github.com/cinno/CVE-2015-7755-POC
- Juniper SSH Backdoor Scanner (metasploit)

## Other vulnerabilities in n/a

- [CVE-2017-2336](https://insights.sbomify.com/CVE-2017-2336/): ScreenOS: XSS vulnerability in ScreenOS Firewall (critical 9.6)
- [CVE-2017-2335](https://insights.sbomify.com/CVE-2017-2335/): ScreenOS: XSS vulnerability in ScreenOS Firewall (high 8.4)
- [CVE-2017-2337](https://insights.sbomify.com/CVE-2017-2337/): ScreenOS: XSS vulnerability in ScreenOS Firewall (high 8.4)
- [CVE-2017-2338](https://insights.sbomify.com/CVE-2017-2338/): ScreenOS: XSS vulnerability in ScreenOS Firewall (high 8.4)
- [CVE-2017-2339](https://insights.sbomify.com/CVE-2017-2339/): ScreenOS: XSS vulnerability in ScreenOS Firewall (high 8.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2015-7755 and fix it if it is affected.

What it is: CVE-2015-7755 is a critical authentication bypass vulnerability in n/a, published on 19 Dec 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2015-7755 in the wild since at least 2 Oct 2025.

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-2015-7755/ (Markdown: https://insights.sbomify.com/CVE-2015-7755/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-7755
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-7755
- OSV: https://osv.dev/vulnerability/CVE-2015-7755

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-7755/
Summaries are generated and may contain mistakes; the official description above is the record.