Security readout for executives and security teams
A very old flaw in Watchguard's Firebox II firewall allowed an attacker on the network to crash its login service by sending a malformed web address to port 4100. The device could stop responding, disrupting protected connections. This CVE dates to 2000 and is only relevant to organizations still running legacy Firebox II hardware, which has long been end-of-life. Exposure is limited to environments still operating legacy Watchguard Firebox II appliances with the authentication service on port 4100 reachable from untrusted networks. Modern Watchguard product lines are unaffected. Given the age (2000) and the end-of-life status of Firebox II, real-world exposure today should be negligible outside of unmanaged or forgotten legacy deployments. Low priority. This is a 25-year-old denial-of-service issue affecting a discontinued firewall product. Action is only warranted if legacy Firebox II hardware is still in use, in which case the device should be replaced as part of normal lifecycle management rather than as an urgent incident response. Mitigation focus: Retire any remaining Watchguard Firebox II appliances and migrate to a currently supported firewall platform.; Restrict access to TCP port 4100 to trusted management networks only.; Consult Watchguard legacy guidance for any residual advisories on Firebox II authentication..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2000-0783 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- firebox-url-dos(5098)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.