MEDIUM
CVE-2021-39602
CWE-120Published: August 23, 2021· Updated: Jun 17, 2026
6.5
CVSS v3.1
Official Description
A Buffer Overflow vulnerabilty exists in Miniftpd 1.0 in the do_mkd function in the ftpproto.c file, which could let a remote malicious user cause a Denial of Service.
Technical Analysis
CVE-2021-39602 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
miniftpd_project1 product(s)
miniftpd
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (2)
→
https://github.com/Gabe-commiter/Miniftpd/issues/1Exploit · Issue Tracking · Third Party Advisory
→
https://github.com/Gabe-commiter/Miniftpd/issues/1Exploit · Issue Tracking · Third Party Advisory
Quick Facts
CVE IDCVE-2021-39602
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-120
CISA KEVNo
Affected1 vendor(s)
PublishedAug 23, 2021
Related CVEs (CWE-120)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-39602 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.