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ssrfcheck

Versions of the package ssrfcheck before 1.2.0 are vulnerable to Server-Side Request Forgery (SSRF) due to an incomplete denylist of IP address ranges. Specifically, the package fails to classify the reserved IP address space 224.0.0.0/4 (Multicast) as invalid. This oversight allows attackers to craft requests targeting these multicast addresses.

CVE-2025-8267 is a high-severity Server-Side Request Forgery (SSRF) vulnerability affecting versions of the ssrfcheck package prior to 1.2.0. The vulnerability arises from an incomplete denylist implementation that fails to properly classify the reserved multicast IP address range 224.0.0.0/4 as invalid for outbound requests. SSRF vulnerabilities allow attackers to manipulate a vulnerable server into making HTTP or other protocol requests to arbitrary internal or external resources. In this case, the ssrfcheck package, which is presumably used to validate or filter URLs or IP addresses to prevent SSRF, does not block requests targeting multicast addresses. Multicast IPs are typically used for group communication within networks and are not routable on the public internet. By exploiting this oversight, an attacker can craft malicious requests that the server will forward to multicast addresses, potentially triggering unintended behavior or information disclosure within internal network segments or services listening on these multicast groups. The CVSS 4.0 base score of 8.8 reflects the vulnerability's network attack vector, low attack complexity, no privileges or user interaction required, and a high impact on confidentiality with some impact on integrity. Although no known exploits are currently reported in the wild, the vulnerability's nature and ease of exploitation make it a significant risk. The lack of patch links indicates that a fixed version (1.2.0 or later) should be adopted once available to remediate the issue. Organizations using ssrfcheck versions before 1.2.0 should consider this vulnerability critical to address promptly to prevent potential SSRF exploitation targeting multicast IP ranges.

Detailed information about CVE-2025-8267: Server-Side Request Forgery (SSRF) in ssrfcheck affecting null ssrfcheck. Get real-time updates, technical details, an

CVE-2025-8267: Server-Side Request Forgery (SSRF) in ssrfcheck - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-8267: Server-Side Request Forgery (SSRF) in ssrfcheck

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