Vulnerability Note VU#927278

Multiple vulnerabilities in X.400 implementations

Original Release date: 04 Nov 2003 | Last revised: 08 Dec 2003


Multiple vulnerabilities exist in different vendors' X.400 implementations. The impacts of these vulnerabilities are varied and range from denial of service to potential remote execution of arbitrary code.


The U.K. National Infrastructure Security Co-ordination Center (NISCC) has reported multiple vulnerabilities in different vendors' implementations of the X.400 protocols. X.400 is the short name for the set of standards defined by the ISO and the ITU that describe a messaging service. These protocols are widely used in email transport applications among other services.

Messages using the X.400 protocols are normally exchanged utilizing Basic Encoding Rules (BER) encoded ASN.1 data structures. Crafted messages that do not correctly conform to the X.400 ASN.1 definitions may cause a receiving X.400 system to behave in an unpredictable way. A test suite developed by NISCC has exposed vulnerabilities in a variety of X.400 implementations. While most of these vulnerabilities exist in ASN.1 parsing routines, some vulnerabilities may occur elsewhere.

Due to the general lack of specific vulnerability information, this document covers multiple vulnerabilities in different X.400 implementations. Information about individual vendors is available in the Systems Affected section.

Further information is available in NISCC Vulnerability Advisory - 006489/X400


The impacts associated with these vulnerabilities include denial of service, and potential execution of arbitrary code.


Patch or Upgrade

Apply a patch or upgrade as appropriate. Information about specific vendors is available in the Systems Affected section of this document.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Check PointNot Affected04 Nov 200306 Nov 2003
ClavisterNot Affected04 Nov 200304 Nov 2003
FujitsuNot Affected04 Nov 200308 Dec 2003
HitachiNot Affected04 Nov 200306 Nov 2003
IntotoNot Affected04 Nov 200306 Nov 2003
Nortel NetworksNot Affected04 Nov 200304 Nov 2003
Xerox CorporationNot Affected04 Nov 200325 Nov 2003
3ComUnknown04 Nov 200304 Nov 2003
AlcatelUnknown04 Nov 200304 Nov 2003
Apple Computer Inc.Unknown04 Nov 200304 Nov 2003
AT&TUnknown04 Nov 200304 Nov 2003
AvayaUnknown04 Nov 200304 Nov 2003
BorderwareUnknown04 Nov 200304 Nov 2003
BSDIUnknown04 Nov 200304 Nov 2003
Cisco Systems Inc.Unknown04 Nov 200304 Nov 2003
If you are a vendor and your product is affected, let us know.View More »

CVSS Metrics (Learn More)

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



These vulnerabilities were discovered and researched by the NISCC Vulnerability Management Team.

This document was written by Chad R Dougherty based on information provided by NISCC.

Other Information

  • CVE IDs: CAN-2003-0565
  • Date Public: 04 Nov 2003
  • Date First Published: 04 Nov 2003
  • Date Last Updated: 08 Dec 2003
  • Severity Metric: 6.38
  • Document Revision: 11


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