What is CVE-2020-6835?

CVE-2020-6835 is a critical-severity vulnerability in Bftpd Project, classified under Off-by-one Error. CVSS score: 9.8/10. Published 2020-01-10.

How severe is CVE-2020-6835?

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

Vulnerability in Bftpd Project

CVE-2020-6835

An issue was discovered in Bftpd before 5.4. There is a heap-based off-by-one error during file-transfer error checking.

Published 2020-01-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Bftpd Project

Weakness classification (CWE)

CWE-193 — Off-by-one Error

References

fossies.org/linux/bftpd/CHANGELOG (Third Party Advisory, Release Notes)
bftpd.sourceforge.net/news.html (Third Party Advisory)

Frequently asked questions

What is CVE-2020-6835?: CVE-2020-6835 is a critical-severity vulnerability in Bftpd Project, classified under Off-by-one Error. CVSS score: 9.8/10. Published 2020-01-10.
How severe is CVE-2020-6835?: Critical severity. CVSS v3 base score is 9.8 out of 10.