Security readout for executives and security teams
This is an old Cisco router vulnerability affecting IPv6-enabled IOS and IOS XR systems. An attacker on the same local network segment could send a crafted IPv6 packet that may crash the device and possibly run code. Business urgency depends on whether legacy Cisco routing gear still runs these versions with IPv6 enabled. Exposure is most likely in legacy Cisco environments that still operate IOS 12.0-12.4 or IOS XR before 3.2 with IPv6 enabled on reachable local segments. Internet-wide exposure is not stated in the bundle; the attacker position is local network segment access. Prioritize this if legacy Cisco routers still support production networks with IPv6 enabled. The immediate business risk is infrastructure outage, with possible deeper compromise. If no affected legacy systems remain, track as historical hygiene rather than an emergency. Mitigation focus: Inventory Cisco IOS and IOS XR versions on all routing devices.; Identify interfaces and segments where IPv6 is enabled.; Follow Cisco advisory guidance for fixed software or supported upgrade paths..
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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Execution behavior lookup
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Open ATT&CK lookupCVE-2005-2451 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
- cisco-ios-ipv6-packet-command-execution(21591)CVE reference · vdb-entry, x_refsource_XF
- oval:org.mitre.oval:def:5445CVE reference · vdb-entry, signature
Products and packages named in the record
CWE details
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