Metrics
Affected Vendors & Products
Solution
No solution given by the vendor.
Workaround
Mitigation includes: restricting the proxy to trusted origins or authentication, whitelisting allowed target hosts, preventing access to link-local and internal IP ranges, removing support for unsafe HTTP methods/headers, enabling cloud provider mitigations, and deploying network-level protections.
Fri, 26 Sep 2025 01:15:00 +0000
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Thu, 25 Sep 2025 16:15:00 +0000
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ssvc
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Thu, 25 Sep 2025 15:00:00 +0000
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Description | Rob -- W / cors-anywhere instances configured as an open proxy allow unauthenticated external users to induce the server to make HTTP requests to arbitrary targets (SSRF). Because the proxy forwards requests and headers, an attacker can reach internal-only endpoints and link-local metadata services, retrieve instance role credentials or other sensitive metadata, and interact with internal APIs and services that are not intended to be internet-facing. The vulnerability is exploitable by sending crafted requests to the proxy with the target resource encoded in the URL; many cors-anywhere deployments forward arbitrary methods and headers (including PUT), which can permit exploitation of IMDSv2 workflows as well as access to internal management APIs. Successful exploitation can result in theft of cloud credentials, unauthorized access to internal services, remote code execution or privilege escalation (depending on reachable backends), data exfiltration, and full compromise of cloud resources. Mitigation includes: restricting the proxy to trusted origins or authentication, whitelisting allowed target hosts, preventing access to link-local and internal IP ranges, removing support for unsafe HTTP methods/headers, enabling cloud provider mitigations, and deploying network-level protections. | |
Title | Rob--W / cors-anywhere Misconfigured CORS Proxy Allows SSRF | |
Weaknesses | CWE-918 CWE-942 |
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cvssV4_0
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2025-09-26T00:54:59.828Z
Reserved: 2025-09-25T13:38:54.393Z
Link: CVE-2020-36851

Updated: 2025-09-25T15:44:49.853Z

Status : Received
Published: 2025-09-25T15:16:01.503
Modified: 2025-09-26T01:15:35.467
Link: CVE-2020-36851

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