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Security Bulletin: IBM® DB2® contains a denial of service vulnerability in scalar functions (CVE-2018-1977)

Security Bulletin


IBM DB2 contains a denial of service vulnerability on Linux System z® platform. A remote, authenticated DB2 user could exploit this vulnerability by executing a specially-crafted SQL statement with the TRUNCATE scalar functions. This could result in a DB2 server crash; if so, the server would need to be restarted.

Vulnerability Details

CVEID: CVE-2018-1977
DESCRIPTION: IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) contains a denial of service vulnerability. A remote, authenticated DB2 user could exploit this vulnerability by issuing a specially-crafted SELECT statement with TRUNCATE function.
CVSS Base Score: 5.3
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

All fix pack levels of IBM Db2 V11.1 editions on Linux System z® platforms are affected. Other platforms are not affected.


The recommended solution is to apply the appropriate fix for this vulnerability.


The fix for DB2 V11.1 is in V11.1.4.4, available for download from Fix Central.

Release Fixed in fix pack APAR Download URL
V11.1 FP4 IT25162

Workarounds and Mitigations


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Change History

December 12, 2018: Original Version Published.

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.


Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

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Document Information

Modified date:
12 December 2018