CVE-2007-1578: Multiple integer signedness errors in the NTLM implementation in Atrium MERCUR IMAPD (mcrimap4.exe) 5.00.14, w

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HIGH 10.0DOWNGRADE

CVE-2007-1578 is a high-severity flaw (CVSS 10.0) affecting mercur imapd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple integer signedness errors in the NTLM implementation in Atrium MERCUR IMAPD (mcrimap4.exe) 5.00.14, with SP4, allow remote attackers to execute arbitrary code via a long NTLMSSP argument that triggers a stack-based buffer overflow.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	16.4% (top 3%)
CISA exploited list	No
Published	2007-03-21
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: atrium software

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

Am I affected?

Timeline

2007-03-21 23:19 UTCPublished CVE record published
2026-06-16 22:37 UTCUpdated Record last modified

atrium software mercur imapd DOWNGRADE

Affected: 5.00.14 sp4

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.00.14

1. Check installed version

apt-cache policy mercur-imapd || rpm -q mercur-imapd || mercur-imapd --version

2. No fixed release: DOWNGRADE to a release before 5.00.14 (Debian / Ubuntu)

apt-cache madison mercur-imapd sudo apt install mercur-imapd=<VERSION_BEFORE_5.00.14> sudo apt-mark hold mercur-imapd

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

dnf --showduplicates list mercur-imapd sudo dnf downgrade mercur-imapd-<VERSION_BEFORE_5.00.14> sudo dnf versionlock add mercur-imapd

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: Mercur IMAPD 5.00.14 (Windows x86) - Remote 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-2007-1578?

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

Is CVE-2007-1578 being exploited?

CVE-2007-1578 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-2007-1578 affect?

CVE-2007-1578 affects mercur imapd. Severity is high (CVSS 10.0). Multiple integer signedness errors in the NTLM implementation in Atrium MERCUR IMAPD (mcrimap4.exe) 5.00.14, with SP4, allow remote attackers to execute arbitrary code via a long NTLMSSP argument that triggers a stack-based buffer overflow.

How urgent is CVE-2007-1578?

Priority 64/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2007-1579 HIGH 10.0 MITIGATE DOWNGRADE Stack-based buffer overflow in Atrium MERCUR IMAPD allows remote attackers to have an unknown impact via a cer

References

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