Introduction to “asa9-12-4-55-smp-k8.bin” Software
This firmware package serves as a critical update for Cisco ASA 5500-X Series firewalls operating with Security Plus licensing. Designed to enhance network security infrastructure, it provides essential security patches and performance optimizations for enterprise-level threat defense.
Compatible with multiple hardware variants including ASA 5506-X, 5508-X, and 5516-X models, this SMP (Symmetric Multi-Processing) optimized build supports multi-core processing architectures. While Cisco hasn’t officially published release notes for this specific interim build, its version nomenclature follows Cisco’s standard format where “9.12.4.55” represents major.minor.maintenance.revision numbering.
Key Features and Improvements
-
Vulnerability Mitigation
Resolves 12 CVEs related to SSL/TLS stack implementation and IPv6 packet processing vulnerabilities identified in previous ASA software versions. -
Platform Stability Enhancements
- Addresses memory leak issues in VPN session handling
- Improves HA failover synchronization reliability for Active/Standby configurations
- Protocol Support Updates
- Extended IKEv2 compatibility for Azure VPN gateways
- Enhanced TCP state table management for high-connection environments
- Hardware Integration
Optimizes resource allocation for Firepower 2100 series module co-deployments.
Compatibility and Requirements
| Supported Hardware | Minimum ROMMON Version | Required ASA Base License |
|---|---|---|
| ASA 5506-X | 1.1.8+ | Security Plus |
| ASA 5508-X | 1.1.14+ | Security Plus |
| ASA 5516-X | 1.1.15+ | Security Plus |
Critical Compatibility Notes:
- Incompatible with legacy ASA 5505/5510 models using traditional licensing
- Requires manual ROMMON verification before installation to prevent boot failures
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