CVE-2006-4951: Neon WebMail for Java before 5.08 allows remote attackers to execute arbitrary Java (JSP) code by sending an e

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HIGH 7.5DOWNGRADE

CVE-2006-4951 is a high-severity flaw (CVSS 7.5) affecting neon webmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Neon WebMail for Java before 5.08 allows remote attackers to execute arbitrary Java (JSP) code by sending an e-mail message with a JSP file attachment, which is stored under the web root with a predictable filename.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Published	2006-09-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: neosys

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

Am I affected?

Timeline

2006-09-23 10:07 UTCPublished CVE record published
2026-06-16 22:30 UTCUpdated Record last modified

neosys neon webmail DOWNGRADE

Affected: 5.06 · 5.07

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.06

1. Check installed version

apt-cache policy neon-webmail || rpm -q neon-webmail || neon-webmail --version

2. No fixed release: DOWNGRADE to a release before 5.06 (Debian / Ubuntu)

apt-cache madison neon-webmail sudo apt install neon-webmail=<VERSION_BEFORE_5.06> sudo apt-mark hold neon-webmail

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

dnf --showduplicates list neon-webmail sudo dnf downgrade neon-webmail-<VERSION_BEFORE_5.06> sudo dnf versionlock add neon-webmail

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-2006-4951?

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

Is CVE-2006-4951 being exploited?

CVE-2006-4951 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-2006-4951 affect?

CVE-2006-4951 affects neon webmail. Severity is high (CVSS 7.5). Neon WebMail for Java before 5.08 allows remote attackers to execute arbitrary Java (JSP) code by sending an e-mail message with a JSP file attachment, which is stored under the web root with a predictable filename.

How urgent is CVE-2006-4951?

Priority 53/100. High severity; Public exploit reference

Software pages

Java vulnerabilities

Related CVEs

CVE-2006-4956 MEDIUM 6.8 DOWNGRADE Cross-site scripting (XSS) vulnerability in the updateuser servlet in Neon WebMail for Java before 5.08 allows
CVE-2006-4955 MEDIUM 5.0 DOWNGRADE Directory traversal vulnerability in the downloadfile servlet in Neon WebMail for Java before 5.08 allows remo
CVE-2006-4954 HIGH 7.5 DOWNGRADE The updateuser servlet in Neon WebMail for Java before 5.08 does not validate the in_id parameter, which allow
CVE-2006-4953 HIGH 7.5 DOWNGRADE Multiple SQL injection vulnerabilities in Neon WebMail for Java before 5.08 allow remote attackers to execute
CVE-2006-4952 HIGH 7.5 DOWNGRADE The updatemail servlet in Neon WebMail for Java before 5.08 allows remote attackers to move e-mail messages of

References

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