PatchTheCVECVE-2017-2789: When copying filedata into a buffer, JustSystems Ichitaro Office 2016 Trial will calculate two values to deter
CVE-2017-2789 is a high-severity flaw (CVSS 8.8) affecting ichitaro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
When copying filedata into a buffer, JustSystems Ichitaro Office 2016 Trial will calculate two values to determine how much data to copy from the document. If both of these values are larger than the size of the buffer, the application will choose the smaller of the two and trust it to copy data from the file. This value is larger than the buffer size, which leads to a heap-based buffer overflow. This overflow corrupts an offset in the heap used
Why this priority
- High severity
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 2.3% (top 16%) |
| CISA exploited list | No |
| Weakness | CWE-119 |
| Published | 2017-02-24 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2017-2789?
ichitaro: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2017-2789 being exploited?
CVE-2017-2789 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2017-2789 affect?
CVE-2017-2789 affects ichitaro. Severity is high (CVSS 8.8). When copying filedata into a buffer, JustSystems Ichitaro Office 2016 Trial will calculate two values to determine how much data to copy from the document. If both of these values are larger than the size of the buffer, the application will
How urgent is CVE-2017-2789?
Priority 52/100. High severity
Related CVEs
- CVE-2017-2791 HIGH 7.5 DOWNGRADE JustSystems Ichitaro 2016 Trial contains a vulnerability that exists when trying to open a specially crafted P
- CVE-2017-2790 HIGH 8.8 MITIGATE When processing a record type of 0x3c from a Workbook stream from an Excel file (.xls), JustSystems Ichitaro O
- CVE-2014-7247 HIGH 10.0 DOWNGRADE DOWNGRADE Unspecified vulnerability in JustSystems Ichitaro 2008 through 2011; Ichitaro Government 6, 7, 2008, 2009, and
- CVE-2014-2003 HIGH 7.6 UPGRADE MITIGATE JustSystems JUST Online Update, as used in Ichitaro through 2014 and other products, does not properly validat
- CVE-2013-5990 HIGH 9.3 DOWNGRADE MITIGATE Unspecified vulnerability in JustSystems Ichitaro 2006 through 2011; Ichitaro Government 6, 7, and 2006 throug