What is CVE-2020-8230?

CVE-2020-8230 is a medium-severity vulnerability in Nextcloud Desktop, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2020-08-17.

How severe is CVE-2020-8230?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2020-8230 known to be exploited?

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

Buffer overflow in Nextcloud Desktop

CVE-2020-8230

A memory corruption vulnerability exists in NextCloud Desktop Client v2.6.4 where missing ASLR and DEP protections in for windows allowed to corrupt memory.

Vulnerability class: Buffer Overflow

Published 2020-08-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (26.5th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Nextcloud Desktop
Desktop Client — versions 2.6.5

Weakness classification (CWE)

Public proof-of-concept exploits

Live-Hack-CVE/CVE-2020-8230

References

hackerone.com/reports/380102 (Patch, Third Party Advisory, Issue Tracking)
nextcloud.com/security/advisory/ (Broken Link, Vendor Advisory)

Frequently asked questions

What is CVE-2020-8230?: CVE-2020-8230 is a medium-severity vulnerability in Nextcloud Desktop, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2020-08-17.
How severe is CVE-2020-8230?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2020-8230 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.