No exploitation reportedFix available

CVE-2003-0356

Q: Is CVE-2003-0356 actively exploited?

Active exploitation of CVE-2003-0356 has not been confirmed. Its EPSS score was 9.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2003-0356?

CVE-2003-0356 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2003-06-09
Fixed in0.9.12
WeaknessCWE-193

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2003-06-0904:00CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2003-0356?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2003-0356?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Ethereal

Branch	Affected	Fixed in	Source
0.9	< 0.9.12	0.9.12	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Ethereal to 0.9.12

Advisories and patches

www.debian.orgPatch · Vendor Advisory
www.ethereal.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.010read 2026-10-23
NVDweakness (CWE)CWE-193read 2026-10-23
FIRST EPSSEPSS score9.6 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2003-06-09
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2003-0356?

Is CVE-2003-0356 actively exploited?

Active exploitation of CVE-2003-0356 has not been confirmed. Its EPSS score was 9.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2003-0356?

CVE-2003-0356 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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