HydraIRC CTCP requests denial of service

hydrairc-ctcp-dos (35408) The risk level is classified as MediumMedium Risk


HydraIRC is vulnerable to a denial of service, caused by a heap-based buffer overflow when parsing CTCP requests. By sending specially-crafted CTCP messages and persuading a victim to connect to the server, a remote attacker could exploit this vulnerability to crash the client.


Base Score: 2.8
  Access Vector: Remote
  Access Complexity: High
  Authentication: Not Required
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
Temporal Score: 2.1
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed


Denial of Service


Upgrade to the latest version of HydraIRC (0.3.160 or later), available from the HydraIRC Web site. See References.


  • HydraIRC Web site: HydraIRC.
  • Portcullis Security Advisory 07-007: (HydraIRC) Denial of Service due to a heap smash while parsing CTCP requests.
  • CVE-2007-3837: Heap-based buffer overflow in HydraIRC 0.3.151 allows remote IRC servers to cause a denial of service (application crash) via a long CTCP request message containing '%' (percent) characters.
  • OSVDB ID: 38625: HydraIRC CTCP Request Message Remote Overflow

Platforms Affected:

  • HydraIRC HydraIRC 0.3.151


Jul 13, 2007

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