Is CVE-2007-6263 actively exploited?

No active exploitation of CVE-2007-6263 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2007-6263 be exploited remotely?

Yes. CVE-2007-6263 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2007-6263?

CVE-2007-6263 has a CVSS score of 9.3 (CRITICAL).

HOME VULNERABILITIESCVE-2007-6263

CRITICAL

CVE-2007-6263

CWE-20Published: December 6, 2007· Updated: Jun 16, 2026

9.3

CVSS v3.1

Official Description

The dataconn function in ftpd.c in netkit ftpd (netkit-ftpd) 0.17, when certain modifications to support SSL have been introduced, calls fclose on an uninitialized file stream, which allows remote attackers to cause a denial of service (daemon crash) and possibly have unspecified other impact via some types of FTP over SSL protocol behavior, as demonstrated by breaking a passive FTP DATA connection in a way that triggers an error in the server's SSL_accept function. NOTE: the netkit ftp issue is covered by CVE-2007-5769.

NVD Source

Technical Analysis

CVE-2007-6263 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.