Erik Sperling Johansen

**Name of the Vulnerable Software and Affected Versions** ircd-hybrid versions 7.0.1 and earlier ircd-ratbox versions 1.5.1 and earlier ircd-ratbox versions 2.0rc6 and earlier **Description** The issue affects non-registered IRC users, allowing remote attackers to cause a denial of service by repeatedly making requests. These requests are slowly dequeued due to the lack of a rate-limit imposed on the affected software. **Recommendations** For ircd-hybrid versions 7.0.1 and earlier, update to a version that imposes rate limits on non-registered IRC users. For ircd-ratbox versions 1.5.1 and earlier, update to a version that imposes rate limits on non-registered IRC users. For ircd-ratbox versions 2.0rc6 and earlier, update to a version that imposes rate limits on non-registered IRC users.