How severe is CVE-2016-4296?

CVE-2016-4296 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-4296 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-4296?

CVE-2016-4296 affects Hancom Hancom Office 2014. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-4296?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-4296 published?

CVE-2016-4296 was published on 2017-01-06 and last updated on 2026-06-17.

CVE-2016-4296

CVE-2016-4296 is a high-severity vulnerability in Hancom Hancom Office 2014 with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Hancom Hancom Office 2014
Published: 2017-01-06
Last modified: 2026-06-17

Description

When opening a Hangul Hcell Document (.cell) and processing a record that uses the CSSValFormat object, Hancom Office 2014 will search for an underscore ("_") character at the end of the string and write a null terminator after it. If the character is at the very end of the string, the application will mistakenly write the null-byte outside the bounds of its destination. This can result in heap corruption that can lead code execution under the context of the application

Frequently asked questions

What is CVE-2016-4296?: When opening a Hangul Hcell Document (.cell) and processing a record that uses the CSSValFormat object, Hancom Office 2014 will search for an underscore ("_") character at the end of the string and write a null terminator after it. If the character is at the very end of the string, the application will mistakenly write the null-byte outside the bounds of its destination. This can result in heap corruption that can lead code execution under the context of the application
How severe is CVE-2016-4296?: CVE-2016-4296 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-4296 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-4296?: CVE-2016-4296 affects Hancom Hancom Office 2014. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-4296?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-4296 published?: CVE-2016-4296 was published on 2017-01-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hancom:hancom_office_2014:*:*:*:*:*:*:*:*

More vulnerabilities in Hancom Hancom Office 2014

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CVE-2016-4298 — High (CVSS 7.8): When opening a Hangul HShow Document (.hpt) and processing a structure within the document, Hancom Office 2014 will…
CVE-2016-4295 — High (CVSS 7.8): When opening a Hangul Hcell Document (.cell) and processing a particular record within the Workbook stream, an index…
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