CVE-2017-2790: When processing a record type of 0x3c from a Workbook stream from an Excel file (.xls), JustSystems Ichitaro O

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HIGH 8.8MITIGATE

CVE-2017-2790 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 processing a record type of 0x3c from a Workbook stream from an Excel file (.xls), JustSystems Ichitaro Office trusts that the size is greater than zero, subtracts one from the length, and uses this result as the size for a memcpy. This results in a heap-based buffer overflow and can lead to code execution under the context of the application.

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	1.9% (top 20%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-02-24
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: justsystems

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-02-24 22:59 UTCPublished CVE record published
2026-06-17 01:16 UTCUpdated Record last modified

justsystems ichitaro MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ichitaro || rpm -q ichitaro || ichitaro --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2017-2790?

ichitaro: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-2790 being exploited?

CVE-2017-2790 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-2017-2790 affect?

CVE-2017-2790 affects ichitaro. Severity is high (CVSS 8.8). When processing a record type of 0x3c from a Workbook stream from an Excel file (.xls), JustSystems Ichitaro Office trusts that the size is greater than zero, subtracts one from the length, and uses this result as the size for a memcpy. Thi

How urgent is CVE-2017-2790?

Priority 51/100. High severity

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References

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