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**Name of the Vulnerable Software and Affected Versions** Undernet ircu versions 2.10.12.12 and earlier snircd versions 1.3.4 and earlier **Description** The issue allows remote attackers to cause a denial of service, resulting in a daemon crash, by sending a malformed MODE command. This is due to a problem in the `send user mode` function. **Recommendations** For Undernet ircu versions 2.10.12.12 and earlier, consider disabling the `send user mode` function until a patch is available. For snircd versions 1.3.4 and earlier, restrict access to the MODE command to minimize the risk of exploitation.