CVE-2003-0159: Heap-based buffer overflow in the NTLMSSP code for Ethereal 0.9.9 and earlier allows remote attackers to cause

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HIGH 7.5DOWNGRADE

CVE-2003-0159 is a high-severity flaw (CVSS 7.5) affecting ethereal. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in the NTLMSSP code for Ethereal 0.9.9 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Published	2003-04-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ethereal group

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2003-04-02 05:00 UTCPublished CVE record published
2026-06-16 22:01 UTCUpdated Record last modified

ethereal group ethereal DOWNGRADE

Affected: 0.8.18 · 0.9.0 · 0.9.1 · 0.9.2 · 0.9.3 · 0.9.4 · 0.9.5 · 0.9.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.8.18

1. Check installed version

apt-cache policy ethereal || rpm -q ethereal || ethereal --version

2. No fixed release: DOWNGRADE to a release before 0.8.18 (Debian / Ubuntu)

apt-cache madison ethereal sudo apt install ethereal=<VERSION_BEFORE_0.8.18> sudo apt-mark hold ethereal

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ethereal sudo dnf downgrade ethereal-<VERSION_BEFORE_0.8.18> sudo dnf versionlock add ethereal

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2003-0159?

ethereal: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2003-0159 being exploited?

CVE-2003-0159 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2003-0159 affect?

CVE-2003-0159 affects ethereal. Severity is high (CVSS 7.5). Heap-based buffer overflow in the NTLMSSP code for Ethereal 0.9.9 and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary code.

How urgent is CVE-2003-0159?

Priority 49/100. High severity

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References

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