CVE-2006-0537: Buffer overflow in the POP3 server in Kinesphere Corporation eXchange before 5.0.060125 allows remote attacker

This week

HIGH 7.5DOWNGRADE

CVE-2006-0537 is a high-severity flaw (CVSS 7.5) affecting exchange pop3. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the POP3 server in Kinesphere Corporation eXchange before 5.0.060125 allows remote attackers to execute arbitrary code via a long RCPT TO argument.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	41.5% (top 1%)
CISA exploited list	No
Published	2006-02-04
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: kinesphere corporation

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

Am I affected?

Timeline

2006-02-04 00:06 UTCPublished CVE record published
2026-06-16 22:20 UTCUpdated Record last modified

kinesphere corporation exchange pop3 DOWNGRADE

Affected: 5.0_build_050203

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0_build_050203

1. Check installed version

apt-cache policy exchange-pop3 || rpm -q exchange-pop3 || exchange-pop3 --version

2. No fixed release: DOWNGRADE to a release before 5.0_build_050203 (Debian / Ubuntu)

apt-cache madison exchange-pop3 sudo apt install exchange-pop3=<VERSION_BEFORE_5.0_build_050203> sudo apt-mark hold exchange-pop3

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

dnf --showduplicates list exchange-pop3 sudo dnf downgrade exchange-pop3-<VERSION_BEFORE_5.0_build_050203> sudo dnf versionlock add exchange-pop3

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: eXchange POP3 5.0.050203 - RPCT TO Remote Buffer Overflow

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-2006-0537?

exchange pop3: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-0537 being exploited?

CVE-2006-0537 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-2006-0537 affect?

CVE-2006-0537 affects exchange pop3. Severity is high (CVSS 7.5). Buffer overflow in the POP3 server in Kinesphere Corporation eXchange before 5.0.060125 allows remote attackers to execute arbitrary code via a long RCPT TO argument.

How urgent is CVE-2006-0537?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2004-1945 HIGH 7.5 DOWNGRADE Buffer overflow in Kinesphere eXchange POP3 allows remote attackers to execute arbitrary code via a long MAIL

References

← Back to latest CVEs