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CVE-2017-7561 is a moderate-severity flaw in the RESTEasy JAX-RS CORS Filter. The filter failed to add an HTTP Vary: Origin response header when generating Origin-dependent CORS responses. Consequently, intermediary or client caches can treat responses generated for one Origin as reusable for requests from a different Origin. This affects RESTEasy versions 3.0.7 through versions before 4.0.0.Beta1, including affected JBoss Enterprise Application Platform 7 deployments.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Vulnerability referenced by HPE as affecting HPE Telco Universal SLA Management <=4.6; specific technical details not provided in the bulletin excerpt.
A RESTEasy CORS-filter flaw in which the Vary header is not added, enabling cache poisoning.
A RESTEasy CORS-filter flaw in which omission of the Vary header can enable cache poisoning.
A RESTEasy CORS-filter flaw in which a Vary header is not added, enabling cache poisoning.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.