CVE-2015-7755 — AI Deep Analysis Summary

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: Weak password validation logic. The system accepts a specific hardcoded string as a valid password for the root account. It’s a classic **Authentication Bypass** flaw.

Q: Who is affected? (Versions/Components)

📦 **Affected Versions**: • ScreenOS 6.2.0r15 – 6.2.0r18 • ScreenOS 6.3.0r12 – 6.3.0r20 (specifically before 6.3.0r12b) ⚠️ Check your firewall firmware immediately!

Q: What can hackers do? (Privileges/Data)

👑 **Privileges**: Full **Administrator Access** (root). 📂 **Data**: Complete control over network traffic, configs, and sensitive data. Attackers can install malware or spy on users.

Q: Is exploitation threshold high? (Auth/Config)

🔓 **Threshold**: **LOW**. 🔑 **Auth**: Requires SSH or Telnet access. ⚙️ **Config**: No complex setup needed. Just connect and use the magic password. Easy for attackers with network access.

Q: Is there a public Exp? (PoC/Wild Exploitation)

💣 **Public Exploit**: **YES**. 🔗 PoC available on GitHub (e.g., `cinno/CVE-2015-7755-POC`). 🌍 **Wild Exploitation**: High risk. Many tools exist to automate this attack.

Q: How to self-check? (Features/Scanning)

🔍 **Self-Check**: 1. Try SSH login with user: `root` 2. Password: `<<< %s(un='%s') = %u` 3. If it logs in, you are vulnerable! 🚨 ⚠️ Do this only on isolated/test networks.

Q: Is it fixed officially? (Patch/Mitigation)

🩹 **Official Fix**: Juniper released patches. ✅ Upgrade to fixed versions (e.g., 6.2.0r19+ or 6.3.0r12b+). 📢 Refer to Juniper Security Advisories (JSA10713).

Q: What if no patch? (Workaround)

🚧 **No Patch? Workaround**: 1. **Disable SSH/Telnet** access if possible. 2. Restrict management interfaces to trusted IPs only. 3. **Migrate** to Juniper Junos OS (ScreenOS is EOL).

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. 📅 Priority: **Immediate Action Required**. This is a known backdoor with easy exploits. Patch now or risk total network breach!

Updated May 06, 2026

This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis →

Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: A critical authentication bypass in Juniper ScreenOS. Hackers can log in as admin without a password! 💥 **Consequences**: Full system compromise, data theft, and network control.…

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Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: Weak password validation logic. The system accepts a specific hardcoded string as a valid password for the root account. It’s a classic **Authentication Bypass** flaw.

Q3Who is affected? (Versions/Components)

📦 **Affected Versions**: 
• ScreenOS 6.2.0r15 – 6.2.0r18
• ScreenOS 6.3.0r12 – 6.3.0r20 (specifically before 6.3.0r12b)
⚠️ Check your firewall firmware immediately!

Q4What can hackers do? (Privileges/Data)

👑 **Privileges**: Full **Administrator Access** (root). 
📂 **Data**: Complete control over network traffic, configs, and sensitive data. Attackers can install malware or spy on users.

Q5Is exploitation threshold high? (Auth/Config)

🔓 **Threshold**: **LOW**. 
🔑 **Auth**: Requires SSH or Telnet access. 
⚙️ **Config**: No complex setup needed. Just connect and use the magic password. Easy for attackers with network access.

Q6Is there a public Exp? (PoC/Wild Exploitation)

💣 **Public Exploit**: **YES**. 
🔗 PoC available on GitHub (e.g., `cinno/CVE-2015-7755-POC`). 
🌍 **Wild Exploitation**: High risk. Many tools exist to automate this attack.

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: 
1. Try SSH login with user: `root`
2. Password: `<<< %s(un='%s') = %u`
3. If it logs in, you are vulnerable! 🚨
⚠️ Do this only on isolated/test networks.

Q8Is it fixed officially? (Patch/Mitigation)

🩹 **Official Fix**: Juniper released patches. 
✅ Upgrade to fixed versions (e.g., 6.2.0r19+ or 6.3.0r12b+). 
📢 Refer to Juniper Security Advisories (JSA10713).

Q9What if no patch? (Workaround)

🚧 **No Patch? Workaround**: 
**Disable SSH/Telnet** access if possible. 
Restrict management interfaces to trusted IPs only. 
**Migrate** to Juniper Junos OS (ScreenOS is EOL).

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. 
📅 Priority: **Immediate Action Required**. 
This is a known backdoor with easy exploits. Patch now or risk total network breach!

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