CVE-2006-1937: Multiple unspecified vulnerabilities in Ethereal 0.10.x up to 0.10.14 allow remote attackers to cause a denial

Routine

MEDIUM 5.0DOWNGRADE

CVE-2006-1937 is a medium-severity flaw (CVSS 5.0) affecting ethereal. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple unspecified vulnerabilities in Ethereal 0.10.x up to 0.10.14 allow remote attackers to cause a denial of service (crash from null dereference) via (1) multiple vectors in H.248, and the (2) X.509if, (3) SRVLOC, (4) H.245, (5) AIM, and (6) general packet dissectors; and (7) the statistics counter.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Published	2006-04-25
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · 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

2006-04-25 12:50 UTCPublished CVE record published
2026-06-16 22:23 UTCUpdated Record last modified

ethereal group ethereal DOWNGRADE

Affected: 0.10 · 0.10.0 · 0.10.0a · 0.10.1 · 0.10.2 · 0.10.3 · 0.10.4 · 0.10.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.10

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.10 (Debian / Ubuntu)

apt-cache madison ethereal sudo apt install ethereal=<VERSION_BEFORE_0.10> sudo apt-mark hold ethereal

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

dnf --showduplicates list ethereal sudo dnf downgrade ethereal-<VERSION_BEFORE_0.10> 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-2006-1937?

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

Is CVE-2006-1937 being exploited?

CVE-2006-1937 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-2006-1937 affect?

CVE-2006-1937 affects ethereal. Severity is medium (CVSS 5.0). Multiple unspecified vulnerabilities in Ethereal 0.10.x up to 0.10.14 allow remote attackers to cause a denial of service (crash from null dereference) via (1) multiple vectors in H.248, and the (2) X.509if, (3) SRVLOC, (4) H.245, (5) AIM,

How urgent is CVE-2006-1937?

Priority 39/100. No elevated risk signals yet.

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References

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