What is CVE-2021-40239?

CVE-2021-40239 is a critical-severity vulnerability in Miniftpd Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-10-11.

How severe is CVE-2021-40239?

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

Is CVE-2021-40239 known to be exploited?

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

Buffer overflow in Miniftpd Project

CVE-2021-40239

A Buffer Overflow vulnerability exists in the latest version of Miniftpd in the do_retr function in ftpproto.c

Vulnerability class: Buffer Overflow

EPSS: 0.014 (69.0th percentile) — read the EPSS interpretation.

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.

Affected products

Miniftpd_project Miniftpd — versions 1.0
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-40239?: CVE-2021-40239 is a critical-severity vulnerability in Miniftpd Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-10-11.
How severe is CVE-2021-40239?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-40239 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.