CVE-2013-3947: Buffer overflow in MedCoreD.sys in AhnLab V3 Internet Security 8.0.7.5 (Build 1373) allows local users to gain

Routine

HIGH 7.8DOWNGRADE

CVE-2013-3947 is a high-severity flaw (CVSS 7.8) affecting v3 internet security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in MedCoreD.sys in AhnLab V3 Internet Security 8.0.7.5 (Build 1373) allows local users to gain privileges via a crafted 0xA3350014 IOCTL call.

Why this priority

High severity

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-119, CWE-264
Published	2018-04-24
Last modified	2026-06-16

Publisher (CNA): Flexera Software LLC · Vendor: ahnlab

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

Am I affected?

Timeline

2018-04-24 20:29 UTCPublished CVE record published
2026-06-16 23:56 UTCUpdated Record last modified

ahnlab v3 internet security DOWNGRADE

Affected: 8.0.7.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0.7.5

1. Check installed version

apt-cache policy v3-internet-security || rpm -q v3-internet-security || v3-internet-security --version

2. No fixed release: DOWNGRADE to a release before 8.0.7.5 (Debian / Ubuntu)

apt-cache madison v3-internet-security sudo apt install v3-internet-security=<VERSION_BEFORE_8.0.7.5> sudo apt-mark hold v3-internet-security

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

dnf --showduplicates list v3-internet-security sudo dnf downgrade v3-internet-security-<VERSION_BEFORE_8.0.7.5> sudo dnf versionlock add v3-internet-security

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.

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-2013-3947?

v3 internet security: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-3947 being exploited?

CVE-2013-3947 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-2013-3947 affect?

CVE-2013-3947 affects v3 internet security. Severity is high (CVSS 7.8). Buffer overflow in MedCoreD.sys in AhnLab V3 Internet Security 8.0.7.5 (Build 1373) allows local users to gain privileges via a crafted 0xA3350014 IOCTL call.

How urgent is CVE-2013-3947?

Priority 37/100. High severity

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References

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