Vulnerability Note VU#277048

Multiple Cisco ONS control cards fail to properly handle invalid TCP responses

Original Release date: 27 Jul 2004 | Last revised: 05 Aug 2004


A vulnerability exists in multiple control cards used by Cisco ONS devices. This vulnerability could allow a remote attacker to cause a denial-of-service condition.


Cisco's Optical Networking product line consists of a series of devices designed to offer high-bandwidth data services. These optical devices are managed through a series of control cards, which vary depending on the model of the device. There is a vulnerability in the way the XTC, TCC/TCC+/TCC2 and TCCi/TCC2 control cards handle invalid TCP responses. By sending an invalid TCP response to a vulnerable optical device, a remote attacker can cause the connection to enter an invalid TCP state. This could result in the control cards reseting.

Cisco ONS 15327 Edge Optical Transport Platform releases:

    • 4.6(0) and 4.6(1)
    • 4.1(0) to 4.1(3)
    • 4.0(0) to 4.0(2)
    • 3.x(x) and earlier

Cisco ONS 15454 Optical Transport Platform releases:
    • 4.6(0) and 4.6(1)
    • 4.5(x)
    • 4.1(0) to 4.1(3)
    • 4.0(0) to 4.0(2)
    • 3.x(x)
    • earlier than 2.3(5)

Cisco ONS 15454 SDH Multiplexer Platform releases:
    • 4.6(0) and 4.6(1)
    • 4.5(x)
    • 4.1(0) to 4.1(3)
    • 4.0(0) to 4.0(2)
    • 3.x(x)
    • earlier than 2.3(5)

Not vulnreable
Cisco ONS 15600 Multiservice Switching Platform


A remote, unauthenticated attacker could cause control cards to reset on an affected optical device. Repeated exploitation of this vulnerability could result in a denial of service.

For more information on the impact of this vulnerability, please refer to the "Impact" section of the Cisco Advisory.


Please refer to the "Software Versions and Fixes" section of the Cisco Advisory for more information on upgrading.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Cisco Systems Inc.Affected-27 Jul 2004
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



This vulnerability was reported by the Cisco Systems Product Security Incident Response Team ( PSIRT ) .

This document was written by Damon Morda based on information provided by Cisco.

Other Information

  • CVE IDs: Unknown
  • Date Public: 21 Jul 2004
  • Date First Published: 27 Jul 2004
  • Date Last Updated: 05 Aug 2004
  • Severity Metric: 8.03
  • Document Revision: 15


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