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**Name of the Vulnerable Software and Affected Versions** tnef version 1.4.14 **Description** An integer underflow has been identified in the `unicode to utf8()` function. This issue might lead to invalid write operations, which could be controlled by an attacker. **Recommendations** For version 1.4.14, consider disabling the `unicode to utf8()` function until a patch is available to prevent potential exploitation.