CVE-2007-2526: Heap-based buffer overflow in the ConnectAsyncEx function in VNC Viewer ActiveX control (scvncctrl.dll) in the

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HIGH 9.3DOWNGRADE

CVE-2007-2526 is a high-severity flaw (CVSS 9.3) affecting vnc manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in the ConnectAsyncEx function in VNC Viewer ActiveX control (scvncctrl.dll) in the SmartCode VNC Manager 3.6 allows remote attackers to execute arbitrary code via a long argument.

Why this priority

Critical severity
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	9.3 (High)
EPSS exploit chance	7.0% (top 6%)
CISA exploited list	No
Published	2007-05-08
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: smartcode

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

Am I affected?

Timeline

2007-05-08 23:19 UTCPublished CVE record published
2026-06-16 22:39 UTCUpdated Record last modified

smartcode vnc manager DOWNGRADE

Affected: 3.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.6

1. Check installed version

apt-cache policy vnc-manager || rpm -q vnc-manager || vnc-manager --version

2. No fixed release: DOWNGRADE to a release before 3.6 (Debian / Ubuntu)

apt-cache madison vnc-manager sudo apt install vnc-manager=<VERSION_BEFORE_3.6> sudo apt-mark hold vnc-manager

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

dnf --showduplicates list vnc-manager sudo dnf downgrade vnc-manager-<VERSION_BEFORE_3.6> sudo dnf versionlock add vnc-manager

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: SmartCode VNC Manager 3.6 - 'scvncctrl.dll' 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-2007-2526?

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

Is CVE-2007-2526 being exploited?

CVE-2007-2526 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-2007-2526 affect?

CVE-2007-2526 affects vnc manager. Severity is high (CVSS 9.3). Heap-based buffer overflow in the ConnectAsyncEx function in VNC Viewer ActiveX control (scvncctrl.dll) in the SmartCode VNC Manager 3.6 allows remote attackers to execute arbitrary code via a long argument.

How urgent is CVE-2007-2526?

Priority 61/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference

References

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