VAR-200708-0166
Vulnerability from variot - Updated: 2025-04-10 23:19Buffer overflow in the Next Hop Resolution Protocol (NHRP) functionality in Cisco IOS 12.0 through 12.4 allows remote attackers to cause a denial of service (restart) and execute arbitrary code via a crafted NHRP packet. Cisco IOS is prone to a remote buffer-overflow vulnerability because it fails to perform adequate boundary checks on user-supplied data. Attackers can exploit this issue to execute arbitrary code in the context of the affected component. Attackers could also restart the device, resulting in denial-of-service conditions. Cisco IOS 12.0 through 12.4 are vulnerable.
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The vulnerability is caused due to a boundary error in the implementation of the Next Hop Resolution Protocol. This can be exploited to cause a buffer overflow by sending a specially crafted NHRP packet containing an invalid total length in the fixed header.
Successful exploitation requires that support for the Next Hop Resolution Protocol is enabled.
SOLUTION: Apply updated versions or vendor workarounds (please see the vendor advisory for details).
PROVIDED AND/OR DISCOVERED BY: The vendor credits Martin Kluge.
CHANGELOG: 2007-08-09: Updated "Description" section with additional information.
ORIGINAL ADVISORY: http://www.cisco.com/warp/public/707/cisco-sa-20070808-nhrp.shtml
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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