Security readout for executives and security teams
A flaw in Cisco's TACACS+ tac_plus authentication server lets a remote attacker crash the service by sending a malformed packet with an oversized length field. If the service goes down, network device logins that depend on it can fail, disrupting administrator access. There is no indication of data theft, but availability of authentication infrastructure is directly at risk. Exposure is limited to environments still running the legacy Cisco tac_plus daemon reachable on TCP/49, typically inside management networks. Most modern deployments use Cisco ACS/ISE or hardened TACACS+ forks, so exposure today is expected to be low but non-zero in older lab, ISP, or industrial networks. Low to moderate priority for most organizations, higher if legacy TACACS+ still gates admin access to critical network gear. Treat as an availability risk to the authentication control plane rather than a data breach risk, and prioritize retiring unsupported daemons. Mitigation focus: Inventory hosts running legacy Cisco tac_plus and identify management interfaces exposed to TCP/49.; Restrict TACACS+ access via ACLs so only trusted admin subnets can reach the daemon.; Consult current Cisco guidance and migrate off legacy tac_plus to a supported AAA product..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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CVE-2000-0486 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
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- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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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
- tacacsplus-packet-length-dos(4985)CVE reference · vdb-entry, x_refsource_XF
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CWE details
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