CVE-2002-0406: Menasoft SPHERE server 0.99x and 0.5x allows remote attackers to cause a denial of service by establishing a l

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MEDIUM 5.0DOWNGRADE

CVE-2002-0406 is a medium-severity flaw (CVSS 5.0) affecting sphereserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Menasoft SPHERE server 0.99x and 0.5x allows remote attackers to cause a denial of service by establishing a large number of connections to the server without providing login credentials, which prevents other users from being able to log in.

Why this priority

EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	7.1% (top 6%)
CISA exploited list	No
Published	2002-07-26
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: menasoft

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

Am I affected?

Timeline

2002-07-26 04:00 UTCPublished CVE record published
2026-06-16 21:57 UTCUpdated Record last modified

menasoft sphereserver DOWNGRADE

Affected: 0.99f · 0.99i

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.99f

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.99f (Debian / Ubuntu)

apt-cache madison sphereserver sudo apt install sphereserver=<VERSION_BEFORE_0.99f> sudo apt-mark hold sphereserver

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

dnf --showduplicates list sphereserver sudo dnf downgrade sphereserver-<VERSION_BEFORE_0.99f> sudo dnf versionlock add sphereserver

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Menasoft SPHEREserver 0.99 - Denial of Service

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-2002-0406?

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

Is CVE-2002-0406 being exploited?

CVE-2002-0406 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-2002-0406 affect?

CVE-2002-0406 affects sphereserver. Severity is medium (CVSS 5.0). Menasoft SPHERE server 0.99x and 0.5x allows remote attackers to cause a denial of service by establishing a large number of connections to the server without providing login credentials, which prevents other users from being able to log in

How urgent is CVE-2002-0406?

Priority 46/100. EPSS top 6%: very likely to be exploited; Public exploit reference

References

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