An improper link resolution before file access (‘Link Following’) vulnerability has been reported to affect QNAP device running QuTScloud, QuTS hero, and QTS. If exploited, this vulnerability allows remote attackers to traverse the file system to unintended locations and read or overwrite the contents of unexpected files. We have already fixed this vulnerability in the following versions of QuTScloud, QuTS hero, and QTS: QuTScloud c5.0.1.1998 and later QuTS hero h4.5.4.1971 build 20220310 and later QuTS hero h5.0.0.1986 build 20220324 and later QTS build 20220303 and later QTS build 20220303 and later QTS 4.2.6 build 20220304 and later QTS build 20220302 and later QTS build 20220324 and later QTS build 20220329 and later

Source: CVE-2021-44052

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