How severe is CVE-2017-6307?

CVE-2017-6307 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-2017-6307 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-6307?

CVE-2017-6307 primarily affects Tnef Project Tnef. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-6307?

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-2017-6307 published?

CVE-2017-6307 was published on 2017-02-24 and last updated on 2026-06-17.

CVE-2017-6307

CVE-2017-6307 is a high-severity vulnerability in Tnef Project Tnef 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Tnef Project Tnef
Published: 2017-02-24
Last modified: 2026-06-17

Description

An issue was discovered in tnef before 1.4.13. Two OOB Writes have been identified in src/mapi_attr.c:mapi_attr_read(). These might lead to invalid read and write operations, controlled by an attacker.

Frequently asked questions

What is CVE-2017-6307?: An issue was discovered in tnef before 1.4.13. Two OOB Writes have been identified in src/mapi_attr.c:mapi_attr_read(). These might lead to invalid read and write operations, controlled by an attacker.
How severe is CVE-2017-6307?: CVE-2017-6307 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-2017-6307 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-6307?: CVE-2017-6307 primarily affects Tnef Project Tnef. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-6307?: 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-2017-6307 published?: CVE-2017-6307 was published on 2017-02-24 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:tnef_project:tnef:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

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CVE-2017-8911 — Critical (CVSS 9.8): An integer underflow has been identified in the unicode_to_utf8() function in tnef 1.4.14. This might lead to invalid…
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