CVE Alert: CVE-2015-7755 – n/a – n/a
CVE-2015-7755
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.
AI Summary Analysis
Risk verdict
Critical risk; exploitation is active per CISA KEV and should be treated as priority 1.
Why this matters
Remote administrative access to vulnerable firewall appliances could grant full control, including VPN decryption and rapid lateral movement within networks. With no user interaction required and no privileges needed to begin, a single exposed device can seed widespread compromise.
Most likely attack path
Attack path relies on network access to management interfaces (SSH/TELNET) with no authentication requirements in this flaw, enabling immediate admin takeovers. Complexity is low, and attacker scope is network-wide, so a single reachable device can be leveraged to pivot to connected infrastructure and sensitive policy/data stores.
Who is most exposed
Organisations with publicly reachable management interfaces or outdated firmware on firewall/VPN gateways are at greatest risk, especially in large distributed environments where management traffic is allowed from broad networks.
Detection ideas
- Detect anomalous admin logins via SSH/TELNET from unusual IPs or destinations, especially without MFA.
- Monitor for new or modified admin accounts and rapid, high-privilege configuration changes.
- Flag unusual VPN/decryption activity following a management session.
- Correlate sudden spikes in management traffic with successful login events.
- Look for known-CERT/industry advisories or IPS alerts linked to management-interface abuse.
Mitigation and prioritisation
- Apply the vendor/firmware patch to the fixed release; treat as priority 1.
- Disable Telnet; restrict SSH to trusted management hosts or jump servers; enforce ACLs on management interfaces.
- Strengthen authentication (prefer key-based access where supported; disable password-based admin where possible; enable MFA if available).
- Implement strict change-management and backup procedures; test patches in a staging environment before rollout.
- Enable enhanced logging and real-time monitoring of admin activity and management-plane traffic.
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