{"id":84680,"date":"2025-10-26T05:32:48","date_gmt":"2025-10-26T05:32:48","guid":{"rendered":""},"modified":"2025-10-29T10:23:34","modified_gmt":"2025-10-29T16:23:34","slug":"cve-2025-9817-denial-of-service-vulnerability-in-wireshark-ssh-dissector","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-9817-denial-of-service-vulnerability-in-wireshark-ssh-dissector\/","title":{"rendered":"CVE-2025-9817: Denial of Service Vulnerability in Wireshark SSH Dissector<\/strong>"},"content":{"rendered":"

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

This report discusses a significant vulnerability, CVE-2025-9817, found in the SSH dissector of Wireshark versions 4.4.0 to 4.4.8. This vulnerability could potentially lead to system compromise or data leakage, posing severe risks to any organization utilizing the affected versions of Wireshark. With a CVSS Severity Score of 7.8, it is essential to take immediate action to mitigate these risks.<\/p>\n

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

CVE ID: CVE-2025-9817
\nSeverity: High (CVSS: 7.8)
\nAttack Vector: Network
\nPrivileges Required: Low
\nUser Interaction: None
\nImpact: Denial of service leading to potential system<\/a> compromise or data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Wireshark | 4.4.0 to 4.4.8<\/p>\n

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

The vulnerability arises from a flaw in the SSH dissector of Wireshark. Specific types of network traffic can trigger this flaw, causing Wireshark to crash. This disruption in service could be leveraged by an attacker to compromise the system<\/a> or gain unauthorized access to sensitive data.<\/p>\n

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

Here is a conceptual example of how this vulnerability might be exploited. The attacker sends a malicious SSH packet that triggers the vulnerability and causes a crash. This example is not a working exploit, but a simplified representation of the attack.<\/p>\n

ssh -p [target_port] -o ProxyCommand=\"echo [malicious_payload] | nc [target_ip] %p\" [username]@[target_ip]<\/code><\/pre>\n
Mitigation Guidance<\/strong><\/p>\n
To mitigate the risks associated with this vulnerability, users should immediately apply the vendor patch. If the patch cannot be applied immediately, it is recommended to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. It is also advisable to monitor network traffic for any abnormal SSH packets, which could be an indication of an attempted exploit.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview This report discusses a significant vulnerability, CVE-2025-9817, found in the SSH dissector of Wireshark versions 4.4.0 to 4.4.8. This vulnerability could potentially lead to system compromise or data leakage, posing severe risks to any organization utilizing the affected versions of Wireshark. With a CVSS Severity Score of 7.8, it is essential to take immediate […]<\/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":[87],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-84680","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-dos"],"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