CVE-2006-5559: The Execute method in the ADODB.Connection 2.7 and 2.8 ActiveX control objects (ADODB.Connection.2.7 and ADODB

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HIGH 9.3WATCHLISTDOWNGRADE

CVE-2006-5559 is a high-severity flaw (CVSS 9.3) affecting data access components. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Execute method in the ADODB.Connection 2.7 and 2.8 ActiveX control objects (ADODB.Connection.2.7 and ADODB.Connection.2.8) in the Microsoft Data Access Components (MDAC) 2.5 SP3, 2.7 SP1, 2.8, and 2.8 SP1 does not properly track freed memory when the second argument is a BSTR, which allows remote attackers to cause a denial of service (Internet Explorer crash) and possibly execute arbitrary code via certain strings in the second and third arg

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
On your watchlist

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

Risk facts

CVSS score	9.3 (High)
EPSS exploit chance	43.6% (top 1%)
CISA exploited list	No
Weakness	CWE-20
Published	2006-10-27
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: microsoft

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

Am I affected?

Timeline

2006-10-27 16:07 UTCPublished CVE record published
2026-06-16 22:31 UTCUpdated Record last modified

microsoft data access components DOWNGRADE

Affected: 2.5 sp3 · 2.8 sp1 · 2.8 · 2.7 sp1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.5

1. Check installed version

apt-cache policy data-access-components || rpm -q data-access-components || data-access-components --version

2. No fixed release: DOWNGRADE to a release before 2.5 (Debian / Ubuntu)

apt-cache madison data-access-components sudo apt install data-access-components=<VERSION_BEFORE_2.5> sudo apt-mark hold data-access-components

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

dnf --showduplicates list data-access-components sudo dnf downgrade data-access-components-<VERSION_BEFORE_2.5> sudo dnf versionlock add data-access-components

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: Microsoft Internet Explorer - ADODB Execute Denial of Service (PoC)

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-2006-5559?

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

Is CVE-2006-5559 being exploited?

CVE-2006-5559 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-2006-5559 affect?

CVE-2006-5559 affects data access components. Severity is high (CVSS 9.3). The Execute method in the ADODB.Connection 2.7 and 2.8 ActiveX control objects (ADODB.Connection.2.7 and ADODB.Connection.2.8) in the Microsoft Data Access Components (MDAC) 2.5 SP3, 2.7 SP1, 2.8, and 2.8 SP1 does not properly track freed m

How urgent is CVE-2006-5559?

Priority 67/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

Internet Explorer vulnerabilities

Related CVEs

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CVE-2006-0003 MEDIUM 5.1 DOWNGRADE Unspecified vulnerability in the RDS.Dataspace ActiveX control, which is contained in ActiveX Data Objects (AD
CVE-2003-0903 HIGH 10.0 DOWNGRADE Buffer overflow in a component of Microsoft Data Access Components (MDAC) 2.5 through 2.8 allows remote attack

References

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