What is CVE-2018-6537?

CVE-2018-6537 is a critical-severity vulnerability in Flexense Syncbreeze, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-02-02.

How severe is CVE-2018-6537?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2018-6537 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Flexense Syncbreeze

CVE-2018-6537

A buffer overflow vulnerability in the control protocol of Flexense SyncBreeze Enterprise v10.4.18 allows remote attackers to execute arbitrary code by sending a crafted packet to TCP port 9121.

Vulnerability class: Buffer Overflow

Published 2018-02-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.042 (90.8th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.042 · newest: 0.042 · change: 0.000

Affected products

Flexense Syncbreeze — versions 10.4.18

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

References

www.exploit-db.com/exploits/43936/ (Exploit, VDB Entry, Third Party Advisory, exploit)

Frequently asked questions

What is CVE-2018-6537?: CVE-2018-6537 is a critical-severity vulnerability in Flexense Syncbreeze, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-02-02.
How severe is CVE-2018-6537?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-6537 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.