{"id":"CVE-2025-65849","sourceIdentifier":"cve@mitre.org","published":"2025-12-08T19:15:50.817","lastModified":"2026-10-18T15:10:00.097","vulnStatus":"Deferred","cveTags":[{"sourceIdentifier":"cve@mitre.org","tags":["disputed"]}],"descriptions":[{"lang":"en","value":"A cryptanalytic break in Altcha Proof-of-Work obfuscation mode version 0.8.0 and later allows for remote visitors to recover the Proof-of-Work nonce in constant time via mathematical deduction. NOTE: this is disputed by the Supplier because the product's objective is \"to discourage automated scraping / bots, not guarantee resistance to determined attackers.\" The documentation states “the goal is not to provide a secure cryptographic algorithm but to use a proof-of-work mechanism that allows any capable device to decrypt the hidden data.”"},{"lang":"es","value":"Una ruptura criptoanalítica en el modo de ofuscación Proof-of-Work de Altcha versión 0.8.0 y posteriores permite a los visitantes remotos recuperar el nonce de Proof-of-Work en tiempo constante mediante deducción matemática. NOTA: esto es disputado por el Proveedor porque el objetivo del producto es 'desalentar el scraping automatizado / bots, no garantizar la resistencia a atacantes decididos.' La documentación establece 'el objetivo no es proporcionar un algoritmo criptográfico seguro sino utilizar un mecanismo de prueba de trabajo que permita a cualquier dispositivo capaz descifrar los datos ocultos.'"}],"affected":[{"source":"cve@mitre.org","affectedData":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":5.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2025-12-09T20:01:39.977561Z","id":"CVE-2025-65849","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","description":[{"lang":"en","value":"CWE-327"}]}],"references":[{"url":"https://altcha.org/docs/v2/obfuscation/","source":"cve@mitre.org"},{"url":"https://github.com/altcha-org/altcha/blob/154f874cbcdd4e639783463130d13988a2bd1bdc/src/helpers.ts#L170-L194","source":"cve@mitre.org"},{"url":"https://github.com/eternal-flame-AD/altcha-deobfs","source":"cve@mitre.org"}]}