Security Bulletin
Summary
The ucnv_UTF8FromUTF8 function in ucnv_u8.cpp in International Components for Unicode (ICU) for C/C++ through 60.1 mishandles ucnv_convertEx calls for UTF-8 to UTF-8 conversion, which allows remote attackers to cause a denial of service (stack-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted string, as demonstrated by ZNC.
Vulnerability Details
CVEID: CVE-2017-15422
DESCRIPTION: Integer overflow in international date handling in International Components for Unicode (ICU) for C/C++ before 60.1, as used in V8 in Google Chrome prior to 63.0.3239.84 and other products, allowed a remote attacker to perform an out of bounds memory read via a crafted HTML page.
CWE: CWE-190: Integer Overflow or Wraparound
CVSS Source: IBM X-Force
CVSS Base score: 6.3
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L)
CVEID: CVE-2017-7868
DESCRIPTION: International Components for Unicode (ICU) for C/C++ before 2017-02-13 has an out-of-bounds write caused by a heap-based buffer overflow related to the utf8TextAccess function in common/utext.cpp and the utext_moveIndex32* function.
CWE: CWE-787: Out-of-bounds Write
CVSS Source: IBM X-Force
CVSS Base score: 7.3
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2011-4599
DESCRIPTION: Stack-based buffer overflow in the _canonicalize function in common/uloc.c in International Components for Unicode (ICU) before 49.1 allows remote attackers to execute arbitrary code via a crafted locale ID that is not properly handled during variant canonicalization.
CWE: CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CVSS Source: IBM X-Force
CVSS Base score: 7.5
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVEID: CVE-2014-7923
DESCRIPTION: The Regular Expressions package in International Components for Unicode (ICU) 52 before SVN revision 292944, as used in Google Chrome before 40.0.2214.91, allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via vectors related to a look-behind expression.
CWE: CWE-17: DEPRECATED: Code
CVSS Source: IBM X-Force
CVSS Base score: 6.8
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:P)
CVEID: CVE-2017-7867
DESCRIPTION: International Components for Unicode (ICU) for C/C++ before 2017-02-13 has an out-of-bounds write caused by a heap-based buffer overflow related to the utf8TextAccess function in common/utext.cpp and the utext_setNativeIndex* function.
CWE: CWE-787: Out-of-bounds Write
CVSS Source: IBM X-Force
CVSS Base score: 7.3
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2016-6293
DESCRIPTION: The uloc_acceptLanguageFromHTTP function in common/uloc.cpp in International Components for Unicode (ICU) through 57.1 for C/C++ does not ensure that there is a '\0' character at the end of a certain temporary array, which allows remote attackers to cause a denial of service (out-of-bounds read) or possibly have unspecified other impact via a call with a long httpAcceptLanguage argument.
CWE: CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CVSS Source: IBM X-Force
CVSS Base score: 9.8
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2017-15396
DESCRIPTION: A stack buffer overflow in NumberingSystem in International Components for Unicode (ICU) for C/C++ before 60.2, as used in V8 in Google Chrome prior to 62.0.3202.75 and other products, allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
CWE: CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CVSS Source: IBM X-Force
CVSS Base score: 6.3
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L)
CVEID: CVE-2020-21913
DESCRIPTION: International Components for Unicode (ICU-20850) v66.1 was discovered to contain a use after free bug in the pkg_createWithAssemblyCode function in the file tools/pkgdata/pkgdata.cpp.
CWE: CWE-416: Use After Free
CVSS Source: IBM X-Force
CVSS Base score: 3.3
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)
CVEID: CVE-2020-10531
DESCRIPTION: An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.
CWE: CWE-190: Integer Overflow or Wraparound
CVSS Source: IBM X-Force
CVSS Base score: 8.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVEID: CVE-2016-7415
DESCRIPTION: Stack-based buffer overflow in the Locale class in common/locid.cpp in International Components for Unicode (ICU) through 57.1 for C/C++ allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a long locale string.
CWE: CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CVSS Source: IBM X-Force
CVSS Base score: 7.3
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2017-17484
DESCRIPTION: The ucnv_UTF8FromUTF8 function in ucnv_u8.cpp in International Components for Unicode (ICU) for C/C++ through 60.1 mishandles ucnv_convertEx calls for UTF-8 to UTF-8 conversion, which allows remote attackers to cause a denial of service (stack-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted string, as demonstrated by ZNC.
CWE: CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CVSS Source: IBM X-Force
CVSS Base score: 7.3
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2017-14952
DESCRIPTION: Double free in i18n/zonemeta.cpp in International Components for Unicode (ICU) for C/C++ through 59.1 allows remote attackers to execute arbitrary code via a crafted string, aka a "redundant UVector entry clean up function call" issue.
CWE: CWE-415: Double Free
CVSS Source: IBM X-Force
CVSS Base score: 9.8
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
IBM X-Force ID: 221122
DESCRIPTION: International Components for Unicode (ICU) for C/C++ is vulnerable to a denial of service, caused by the use of uninitialized value in isMatchAtCPBoundary in icu4c/source/common/ustring.cpp. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause a denial of service condition.
CWE: CWE-665: Improper Initialization
CVSS Source: IBM X-Force
CVSS Base score: 7.5
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) | Applicable Editions |
| IBM® Db2® |
10.5.0.0 - 10.5.0.11 |
Server |
| IBM® Db2® |
11.1.0 - 11.1.4.7 |
Server |
| IBM® Db2® |
11.5.0 - 11.5.9 |
Server |
All platforms are affected.
Any older version not mentioned above is not supported.
Remediation/Fixes
Customers running any vulnerable affected level of an affected Program, V10.5, V11.1, V11.5, can download the special build containing the interim fix for this issue from Fix Central. These special builds are available based on the most recent mod pack level for each impacted release: V10.5 FP11, V11.1.4 FP7, V11.5.9. They can be applied to any affected mod pack level of the appropriate release to remediate this vulnerability.
| Release | Fixed in mod pack | APAR | Download URL |
| V10.5 | TBD | DT261533 | Special Build for V10.5 FP11:
AIX 64-bit |
| V11.1 | TBD | DT261533 | Special Build for V11.1.4 FP7:
AIX 64-bit |
| V11.5 | TBD | DT261533 |
Special Build #62071 or later for V11.5.9 available at this link: https://www.ibm.com/support/pages/node/7087189 |
IBM does not disclose key Db2 functionality nor replication steps for a vulnerability to avoid providing too much information to any potential malicious attacker. IBM does not want to enable a malicious attacker with sufficient knowledge to craft an exploit of the vulnerability.
Note: After December 31, 2025, 11.1 and 10.5 versions of Db2 will not have security fixes made available as they will reach EoS.
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
None
Acknowledgement
Change History
07 Aug 2025: Initial Publication
*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.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
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Document Information
Modified date:
07 August 2025
UID
ibm17241823