{"id":79376,"date":"2025-09-30T13:01:41","date_gmt":"2025-09-30T13:01:41","guid":{"rendered":""},"modified":"2025-10-28T11:37:24","modified_gmt":"2025-10-28T17:37:24","slug":"cve-2025-55069-predictable-seed-vulnerability-in-click-plus-plc-firmware","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-55069-predictable-seed-vulnerability-in-click-plus-plc-firmware\/","title":{"rendered":"CVE-2025-55069: Predictable Seed Vulnerability in Click Plus PLC Firmware<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

CVE-2025-55069 is a high-severity vulnerability that has been discovered in the firmware of the Click Plus PLC, specifically version 3.60. This vulnerability stems from the implementation of a predictable seed in the software’s pseudo-random number generator. In essence, this vulnerability represents a serious risk to the security<\/a> of private keys generated by the software. It is significant because it opens the door for potential system<\/a> compromise or data leakage, which are severe threats to any organization. Anyone using the affected firmware version should take immediate action to mitigate this vulnerability<\/a>.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-55069
\nSeverity: High (CVSS: 8.3)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system compromise and data<\/a> leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Click Plus PLC | Firmware 3.60<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability relies on the fact that the software<\/a> implements a predictable seed for its pseudo-random number generator. In the context of cryptography, this is a severe flaw. Pseudo-random number generators are often used for generating encryption keys, where the security of the generated key heavily depends on the randomness of the generated numbers. If an attacker can predict these numbers, they can reverse-engineer the private key, leading to system<\/a> compromise or data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

For illustrative purposes, we can imagine a simplified pseudo-code example of how the pseudo-random number generator works and how it might be exploited:<\/p>\n

# Vulnerable pseudo-random number generator\ndef vulnerable_prng(seed):\nreturn (seed * 0x5DEECE66D + 0xB) & ((1 << 48) - 1)\n# Predictable seed\nseed = 12345\n# Attacker predicts the seed\npredicted_seed = seed\n# Attacker generates the same pseudo-random numbers\nfor i in range(10):\nprint(vulnerable_prng(predicted_seed))\npredicted_seed += 1<\/code><\/pre>\n
In this conceptual example, an attacker who knows or guesses the seed can generate the same sequence of pseudo-random numbers as the software, potentially allowing them to compromise private keys or other sensitive data<\/a>.
\nMitigation for this vulnerability involves applying a vendor patch or using a WAF (Web Application Firewall) or IDS (Intrusion Detection System) as temporary mitigation. However, it's vital to follow through with vendor patches to ensure long-term security.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview CVE-2025-55069 is a high-severity vulnerability that has been discovered in the firmware of the Click Plus PLC, specifically version 3.60. This vulnerability stems from the implementation of a predictable seed in the software’s pseudo-random number generator. In essence, this vulnerability represents a serious risk to the security of private keys generated by the software. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-79376","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t