CVE-2003-0356

Multiple off-by-one vulnerabilities in Ethereal 0.9.11 and earlier allow remote attackers to...

9.8 CriticalFix available

Multiple off-by-one vulnerabilities in Ethereal 0.9.11 and earlier allow remote attackers to cause a denial of service and possibly execute arbitrary code via the (1) AIM, (2) GIOP Gryphon, (3) OSPF, (4) PPTP, (5) Quake, (6) Quake2, (7) Quake3, (8) Rsync, (9) SMB, (10) SMPP, and (11) TSP dissectors, which do not properly use the tvb_get_nstringz and tvb_get_nstringz0 functions.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

9.57%Up 4.4 points since Feb 4, 2022

What each source reports

NVD Score used 9.8

Record: CVE-2003-0356
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 10.0 HighAV:N/AC:L/Au:N/C:C/I:C/A:C
Weakness: CWE-193
Updated: 2026-11-02

CVE List No score

Record: CVE-2003-0356
Updated: 2026-11-02

EUVDEUVD-2003-0351 No score

Record: EUVD-2003-0351
Updated: 2026-11-03

GitHub AdvisoriesGHSA-mxvh-95qr-ww4v 9.8

Multiple off-by-one vulnerabilities in Ethereal 0.9.11 and earlier allow remote attackers to...

Record: GHSA-mxvh-95qr-ww4v
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-193
Updated: 2026-11-02

Affected products

ethereal

Affected packages

Affected packages
Package	Affected	Fixed
`ethereal` Debian:3.0	before 0.9.4-1woody4	0.9.4-1woody4

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2003-0356 is a critical vulnerability (CVSS 9.8) in Ethereal, published May 30, 2003. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 9.57%, the 95th percentile. Fixed in ethereal 0.9.4-1woody4.