How severe is CVE-2017-6371?

CVE-2017-6371 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-6371 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-6371?

CVE-2017-6371 affects Synchro Bbs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-6371?

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-2017-6371 published?

CVE-2017-6371 was published on 2020-02-27 and last updated on 2026-06-17.

CVE-2017-6371

CVE-2017-6371 is a high-severity vulnerability in Synchro Bbs with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Synchro Bbs
Published: 2020-02-27
Last modified: 2026-06-17

Description

Synchronet BBS 3.16c for Windows allows remote attackers to cause a denial of service (service crash) via a long string in the HTTP Referer header.

Frequently asked questions

What is CVE-2017-6371?: Synchronet BBS 3.16c for Windows allows remote attackers to cause a denial of service (service crash) via a long string in the HTTP Referer header.
How severe is CVE-2017-6371?: CVE-2017-6371 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2017-6371 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-6371?: CVE-2017-6371 affects Synchro Bbs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-6371?: 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-2017-6371 published?: CVE-2017-6371 was published on 2020-02-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:synchro:bbs:3.16c:*:*:*:*:windows:*:*