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7.5High

Krzysztof Dabrowski Cmd5checkpw

CVE-2000-0990

cmd5checkpw 0.21 and earlier allows remote attackers to cause a denial of service via an "SMTP AUTH" command with an unknown username.

What this means for your business

  • It affects Krzysztof Dabrowski Cmd5checkpw. It matters if your company, or a supplier that handles your data, runs it.
  • An attacker can use it remotely, over a network.

What to do

  1. 1Check whether your company or your suppliers run Krzysztof Dabrowski Cmd5checkpw, and which version. The affected versions are listed further down this page.
  2. 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS
7.5 (v2.0)
Vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Assigned by
cve@mitre.org

Dates

Published
2000-12-19
Last modified
2026-09-23
Sources
NVD

Affected products

  • Krzysztof Dabrowski Cmd5checkpw0.20, 0.21

As listed in the NVD configuration data. Not a statement about your estate.

References