How severe is CVE-2003-0466?

CVE-2003-0466 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2003-0466?

Affected package information for CVE-2003-0466 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2003-0466?

No fixed version has been published for CVE-2003-0466 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2003-0466 actively exploited in the wild?

Yes. There are 7 known exploit references for CVE-2003-0466, including 5 documented proof-of-concept exploits on Exploit-DB and 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2003-0466?

CVE-2003-0466 has an EPSS (Exploit Prediction Scoring System) score of 90.8%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2003-0466?

CVE-2003-0466 is classified as CWE-193 (CWE-193). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2003-0466?

CVE-2003-0466 affects apple mac os x (1 version, e.g. 10.2.6); apple mac os x server (1 version, e.g. 10.2.6); freebsd freebsd; netbsd netbsd, and 4 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2003-0466 published, and has it been updated?

CVE-2003-0466 was published on August 27, 2003 and was last updated on April 16, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2003-0466

CRITICAL

Off-by-one error in the fb_realpath() function, as derived from the realpath function in BSD, may allow attackers to execute arbitrary code, as demonstrated in wu-ftpd 2.5.0 through…

Published

Aug 27, 2003

Updated

Apr 16, 2026

Affected

0 pkgs

Patched

None yet

Exploits

7 known

EPSS Exploitation Probability

via FIRST.org ↗

90.8%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

Off-by-one error in the fb_realpath() function, as derived from the realpath function in BSD, may allow attackers to execute arbitrary code, as demonstrated in wu-ftpd 2.5.0 through 2.6.2 via commands that cause pathnames of length MAXPATHLEN+1 to trigger a buffer overflow, including (1) STOR, (2) RETR, (3) APPE, (4) DELE, (5) MKD, (6) RMD, (7) STOU, or (8) RNTO.

Affected Products

8 products · 8 configurations

mac os xapple

1 version

10.2.6

mac os x serverapple

1 version

10.2.6

freebsdfreebsd

≥ 4.0 && ≤ 5.0

range

netbsdnetbsd

≥ 1.5 && ≤ 1.6.1

range

openbsdopenbsd

≥ 2.0 && ≤ 3.3

range

Application

wu ftpdredhat

1 version

2.6.1-16

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-74remotelinux✓ Verified

WU-FTPD 2.6.2 - Off-by-One Remote Command Execution

by Xpl017Elz · Aug 3, 2003

Exploit-DB Source

EDB-78remotelinux✓ Verified

WU-FTPD 2.6.2 - Remote Command Execution

by Xpl017Elz · Aug 11, 2003

Exploit-DB Source

EDB-22974remoteunix✓ Verified

WU-FTPD 2.6.2 - 'realpath()' Off-by-One Buffer Overflow

by Xpl017Elz · Aug 2, 2003

Exploit-DB Source

EDB-22976remotefreebsd✓ Verified

FreeBSD 4.8 - 'realpath()' Off-by-One Buffer Overflow

by [email protected] · Jul 31, 2003

Exploit-DB Source

EDB-22975remoteunix✓ Verified

WU-FTPD 2.6.0/2.6.1/2.6.2 - 'realpath()' Off-by-One Buffer Overflow

by Xpl017Elz · Aug 6, 2003

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2003-0466 in your stack?

O3 detects CVE-2003-0466 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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