CVE-2021-42624: A local buffer overflow vulnerability exists in the latest version of Miniftpd in ftpproto.c through the tmp v

Routine

HIGH 7.8MITIGATE

CVE-2021-42624 is a high-severity flaw (CVSS 7.8) affecting miniftpd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A local buffer overflow vulnerability exists in the latest version of Miniftpd in ftpproto.c through the tmp variable, where a crafted payload can be sent to the affected function.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-120
Published	2021-11-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: miniftpd project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-11-04 11:15 UTCPublished CVE record published
2026-06-17 04:09 UTCUpdated Record last modified

miniftpd project miniftpd MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy miniftpd || rpm -q miniftpd || miniftpd --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-42624?

miniftpd: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-42624 being exploited?

CVE-2021-42624 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-42624 affect?

CVE-2021-42624 affects miniftpd. Severity is high (CVSS 7.8). A local buffer overflow vulnerability exists in the latest version of Miniftpd in ftpproto.c through the tmp variable, where a crafted payload can be sent to the affected function.

How urgent is CVE-2021-42624?

Priority 38/100. High severity; Public exploit reference

Related CVEs

CVE-2021-40239 CRITICAL 9.8 DOWNGRADE A Buffer Overflow vulnerability exists in the latest version of Miniftpd in the do_retr function in ftpproto.c
CVE-2021-39602 MEDIUM 6.5 DOWNGRADE A Buffer Overflow vulnerabilty exists in Miniftpd 1.0 in the do_mkd function in the ftpproto.c file, which cou

References

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