CVE-2013-6886: RealVNC VNC 5.0.6 on Mac OS X, Linux, and UNIX allows local users to gain privileges via a crafted argument to

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HIGH 7.2WATCHLISTDOWNGRADE

CVE-2013-6886 is a high-severity flaw (CVSS 7.2) affecting realvnc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

RealVNC VNC 5.0.6 on Mac OS X, Linux, and UNIX allows local users to gain privileges via a crafted argument to the (1) vncserver, (2) vncserver-x11, or (3) Xvnc helper.

Why this priority

High severity
On your watchlist

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

Risk facts

CVSS score	7.2 (High)
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-264
Published	2013-12-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: realvnc

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2013-12-28 04:53 UTCPublished CVE record published
2026-06-17 00:01 UTCUpdated Record last modified

realvnc realvnc DOWNGRADE

Affected: 5.0.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0.6

1. Check installed version

apt-cache policy realvnc || rpm -q realvnc || realvnc --version

2. No fixed release: DOWNGRADE to a release before 5.0.6 (Debian / Ubuntu)

apt-cache madison realvnc sudo apt install realvnc=<VERSION_BEFORE_5.0.6> sudo apt-mark hold realvnc

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

dnf --showduplicates list realvnc sudo dnf downgrade realvnc-<VERSION_BEFORE_5.0.6> sudo dnf versionlock add realvnc

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-2013-6886?

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

Is CVE-2013-6886 being exploited?

CVE-2013-6886 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-2013-6886 affect?

CVE-2013-6886 affects realvnc. Severity is high (CVSS 7.2). RealVNC VNC 5.0.6 on Mac OS X, Linux, and UNIX allows local users to gain privileges via a crafted argument to the (1) vncserver, (2) vncserver-x11, or (3) Xvnc helper.

How urgent is CVE-2013-6886?

Priority 40/100. High severity; On your watchlist

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References

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