CVE-2026-100299 in YSSD-RTMP-H5
Summary
by MITRE • 09/29/2026
In Anjvision YSSD‑RTMP‑H5 firmware version 3.3.2.4, the device includes a legacy password hash on the serial console that relies on a weak DES‑based encryption.
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified in Anjvision YSSD-RTMP-H5 firmware version 3.3.2.4 centers on the improper implementation of authentication mechanisms within the device's serial console interface. Specifically, the system retains a legacy password hash that utilizes Data Encryption Standard (DES) based encryption for securing administrative credentials. This architectural decision represents a significant deviation from modern security best practices, as DES is widely recognized as cryptographically broken and unsuitable for protecting sensitive data in contemporary environments. The presence of this weak hashing mechanism indicates that the device's authentication subsystem has not been adequately updated to address decades of advancements in cryptographic attacks, leaving it vulnerable to efficient offline cracking techniques.
From a technical perspective, the core flaw lies in the algorithmic weakness of DES when applied to password storage. Unlike modern hash functions such as SHA-256 or bcrypt which incorporate salting and computational cost factors to resist brute-force attacks, legacy DES-based hashes are susceptible to rapid decryption using standard hardware acceleration tools like GPU clusters or specialized ASICs. An attacker with physical access to the serial console port can extract these hashed credentials and subsequently reverse them to reveal plaintext passwords. This process is further exacerbated by the lack of rate-limiting or account lockout mechanisms typically associated with secure authentication implementations, allowing for unlimited attempts without triggering security alerts.
The operational impact of this vulnerability is severe, particularly in industrial control systems where physical access may be more attainable than in purely remote environments. If an adversary gains access to the serial console and successfully cracks the weak hash, they obtain full administrative privileges over the device. This level of access allows for comprehensive system compromise, including the modification of network configurations, interception of video streams via RTMP protocols, installation of persistent backdoors, or disruption of critical surveillance operations. In a broader context, this vulnerability can serve as an entry point for lateral movement within a local network segment if credentials are reused across multiple devices, thereby amplifying the risk to the entire infrastructure.
This issue aligns with Common Weakness Enumeration (CWE) category CWE-327, which describes the use of a broken or risky cryptographic algorithm. Furthermore, it relates to CWE-521 regarding weak password requirements and storage practices that fail to protect against unauthorized access. In terms of the MITRE ATT&CK framework, this vulnerability facilitates initial access through physical interaction with system components, mapping closely to techniques involving hardware exploitation or direct console access. The persistence of such legacy code suggests a failure in secure software development lifecycle processes, where outdated cryptographic standards were not deprecated during firmware updates.
Mitigation strategies must prioritize the immediate removal or replacement of the DES-based hashing mechanism with a robust alternative such as PBKDF2, Argon2, or bcrypt, ensuring that all password storage operations utilize strong salting and sufficient computational cost parameters. If an immediate patch is unavailable, administrators should enforce strict physical access controls to prevent unauthorized individuals from connecting to the serial console port. Additionally, network segmentation can limit the blast radius of a compromised device by isolating it within a dedicated VLAN with restricted outbound traffic rules. Regular firmware audits are essential to identify and remediate other instances of deprecated cryptographic practices across the organization's IoT asset inventory.