CVE-2026-18753 in GV-AS1620
Summary
by MITRE • 08/04/2026
The product firmware contains an embedded, static RSA private key utilized by the Lighttpd web server for TLS termination. Exposure of this private key allows malicious actors to breach the confidentiality and integrity of HTTPS communications, enabling traffic decryption and server spoofing.
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Analysis
by VulDB Data Team • 08/04/2026
This vulnerability represents a critical security flaw in embedded firmware where a static RSA private key is hardcoded within the lighttpd web server implementation. The presence of such embedded credentials creates a persistent threat vector that fundamentally compromises the cryptographic security model of the affected system. When a private key is statically embedded in firmware, it eliminates the possibility of key rotation or secure key management practices that are essential for maintaining communication integrity. This weakness directly violates fundamental principles of cryptographic key management and represents a classic case of hard-coded credentials that should never exist in production systems.
The technical implications of this flaw extend beyond simple credential exposure to encompass complete breakdown of transport layer security mechanisms. Attackers who obtain access to this embedded private key can perform man-in-the-middle attacks by decrypting HTTPS traffic flowing through the system, thereby compromising both confidentiality and integrity guarantees that users expect from secure communications. The ability to spoof the server identity through certificate forgery allows malicious actors to establish trust relationships with clients while intercepting or modifying data in transit. This vulnerability aligns with CWE-798, which specifically addresses the use of hard-coded credentials, and represents a direct violation of security best practices outlined in NIST SP 800-57 for cryptographic key management.
The operational impact of this vulnerability is severe and far-reaching across multiple domains of system security. Network administrators lose assurance that their encrypted communications remain protected, potentially exposing sensitive data including personal information, financial transactions, or proprietary business data. The static nature of the private key means that once compromised, the threat persists indefinitely until the firmware is updated or replaced, creating a window of opportunity for attackers to exploit the vulnerability across extended periods. This type of flaw commonly appears in IoT devices and embedded systems where security considerations are often secondary to functionality and cost constraints, making it particularly dangerous in environments where device lifecycle management is limited.
Mitigation strategies must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities from emerging. The primary recommendation involves replacing the embedded private key with a dynamically generated or securely provisioned key that supports proper key rotation mechanisms. Organizations should implement secure firmware update processes that can replace compromised cryptographic materials without requiring physical device replacement. This vulnerability demonstrates the importance of following ATT&CK framework principles for defensive measures, particularly those related to credential access and defense evasion techniques that attackers might employ when exploiting such embedded credentials. Regular security assessments and penetration testing should include verification of cryptographic key storage mechanisms to identify similar hard-coded credential issues across all system components.
The broader implications highlight the critical need for secure development practices in embedded systems where traditional security controls may be insufficient or absent. Modern firmware design should incorporate hardware security modules or secure enclaves that provide protection for cryptographic keys and prevent extraction through conventional means. This vulnerability underscores the necessity of implementing proper key lifecycle management processes, including generation, distribution, storage, and destruction of cryptographic materials in accordance with industry standards such as ISO/IEC 15408 or FIPS 140-2 requirements. The exposure of this embedded private key serves as a stark reminder that security must be integrated into the design phase rather than treated as an afterthought in the development lifecycle.