CVE-2008-4771: Stack-based buffer overflow in VATDecoder.VatCtrl.1 ActiveX control in (1) 4xem VatCtrl Class (VATDecoder.dll

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HIGH 9.3DOWNGRADEDOWNGRADEDOWNGRADE

CVE-2008-4771 is a high-severity flaw (CVSS 9.3) affecting vatctrl class, mpeg4 shm audio control, rtsp mpeg4 sp control. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow in VATDecoder.VatCtrl.1 ActiveX control in (1) 4xem VatCtrl Class (VATDecoder.dll 1.0.0.27 and 1.0.0.51), (2) D-Link MPEG4 SHM Audio Control (VAPGDecoder.dll 1.7.0.5), (3) Vivotek RTSP MPEG4 SP Control (RtspVapgDecoderNew.dll 2.0.0.39), and possibly other products, allows remote attackers to execute arbitrary code via a long Url property. NOTE: some of these details are obtained from third party information.

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	7.1% (top 6%)
CISA exploited list	No
Weakness	CWE-119
Published	2008-10-28
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: 4xem · d-link · vivotek

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

Am I affected?

Timeline

2008-10-28 19:20 UTCPublished CVE record published
2026-06-16 22:58 UTCUpdated Record last modified

4xem vatctrl class DOWNGRADE

Affected: 1.0.0.27 · 1.0.0.51

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0.27

1. Check installed version

apt-cache policy vatctrl-class || rpm -q vatctrl-class || vatctrl-class --version

2. No fixed release: DOWNGRADE to a release before 1.0.0.27 (Debian / Ubuntu)

apt-cache madison vatctrl-class sudo apt install vatctrl-class=<VERSION_BEFORE_1.0.0.27> sudo apt-mark hold vatctrl-class

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

dnf --showduplicates list vatctrl-class sudo dnf downgrade vatctrl-class-<VERSION_BEFORE_1.0.0.27> sudo dnf versionlock add vatctrl-class

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.

d-link mpeg4 shm audio control DOWNGRADE

Affected: 1.7.0.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.0.5

1. Check installed version

apt-cache policy mpeg4-shm-audio-control || rpm -q mpeg4-shm-audio-control || mpeg4-shm-audio-control --version

2. No fixed release: DOWNGRADE to a release before 1.7.0.5 (Debian / Ubuntu)

apt-cache madison mpeg4-shm-audio-control sudo apt install mpeg4-shm-audio-control=<VERSION_BEFORE_1.7.0.5> sudo apt-mark hold mpeg4-shm-audio-control

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

dnf --showduplicates list mpeg4-shm-audio-control sudo dnf downgrade mpeg4-shm-audio-control-<VERSION_BEFORE_1.7.0.5> sudo dnf versionlock add mpeg4-shm-audio-control

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.

vivotek rtsp mpeg4 sp control DOWNGRADE

Affected: 2.0.0.39

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0.39

1. Check installed version

apt-cache policy rtsp-mpeg4-sp-control || rpm -q rtsp-mpeg4-sp-control || rtsp-mpeg4-sp-control --version

2. No fixed release: DOWNGRADE to a release before 2.0.0.39 (Debian / Ubuntu)

apt-cache madison rtsp-mpeg4-sp-control sudo apt install rtsp-mpeg4-sp-control=<VERSION_BEFORE_2.0.0.39> sudo apt-mark hold rtsp-mpeg4-sp-control

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

dnf --showduplicates list rtsp-mpeg4-sp-control sudo dnf downgrade rtsp-mpeg4-sp-control-<VERSION_BEFORE_2.0.0.39> sudo dnf versionlock add rtsp-mpeg4-sp-control

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: D-Link MPEG4 SHM Audio Control - 'VAPGDecoder.dll 1.7.0.5' 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-2008-4771?

vatctrl class: downgrade or apply the listed mitigation; mpeg4 shm audio control: downgrade or apply the listed mitigation; rtsp mpeg4 sp control: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2008-4771 being exploited?

CVE-2008-4771 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-2008-4771 affect?

CVE-2008-4771 affects vatctrl class, mpeg4 shm audio control, rtsp mpeg4 sp control. Severity is high (CVSS 9.3). Stack-based buffer overflow in VATDecoder.VatCtrl.1 ActiveX control in (1) 4xem VatCtrl Class (VATDecoder.dll 1.0.0.27 and 1.0.0.51), (2) D-Link MPEG4 SHM Audio Control (VAPGDecoder.dll 1.7.0.5), (3) Vivotek RTSP MPEG4 SP Control (RtspVapgD

How urgent is CVE-2008-4771?

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

Software pages

D-Link vulnerabilities

References

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