CVE-2006-2391: Buffer overflow in EMC Retrospect Client 5.1 through 7.5 allows remote attackers to cause a denial of service

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HIGH 7.5DOWNGRADE

CVE-2006-2391 is a high-severity flaw (CVSS 7.5) affecting retrospect client. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in EMC Retrospect Client 5.1 through 7.5 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted packet to port 497.

Why this priority

High severity
EPSS top 5%: very likely to be exploited

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	8.1% (top 5%)
CISA exploited list	No
Published	2006-05-16
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: emc

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

Am I affected?

Timeline

2006-05-16 01:02 UTCPublished CVE record published
2026-06-16 22:24 UTCUpdated Record last modified

emc retrospect client DOWNGRADE

Affected: 5.1 · 6.5 · 7.0 · 7.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.1

1. Check installed version

apt-cache policy retrospect-client || rpm -q retrospect-client || retrospect-client --version

2. No fixed release: DOWNGRADE to a release before 5.1 (Debian / Ubuntu)

apt-cache madison retrospect-client sudo apt install retrospect-client=<VERSION_BEFORE_5.1> sudo apt-mark hold retrospect-client

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

dnf --showduplicates list retrospect-client sudo dnf downgrade retrospect-client-<VERSION_BEFORE_5.1> sudo dnf versionlock add retrospect-client

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-2006-2391?

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

Is CVE-2006-2391 being exploited?

CVE-2006-2391 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-2006-2391 affect?

CVE-2006-2391 affects retrospect client. Severity is high (CVSS 7.5). Buffer overflow in EMC Retrospect Client 5.1 through 7.5 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted packet to port 497.

How urgent is CVE-2006-2391?

Priority 50/100. High severity; EPSS top 5%: very likely to be exploited

Related CVEs

CVE-2015-2864 MEDIUM 5.0 DOWNGRADE DOWNGRADE Retrospect and Retrospect Client before 10.0.2.119 on Windows, before 12.0.2.116 on OS X, and before 10.0.2.10
CVE-2003-0490 HIGH 7.2 DOWNGRADE The installation of Dantz Retrospect Client 5.0.540 on MacOS X 10.2.6, and possibly other versions, creates cr

References

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