PatchTheCVECVE-2014-8104: OpenVPN 2.x before 2.0.11, 2.1.x, 2.2.x before 2.2.3, and 2.3.x before 2.3.6 allows remote authenticated users
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MEDIUM 6.8WATCHLISTMITIGATEMITIGATEMITIGATE
CVE-2014-8104 is a medium-severity flaw (CVSS 6.8) affecting mageia, debian linux, opensuse. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
OpenVPN 2.x before 2.0.11, 2.1.x, 2.2.x before 2.2.3, and 2.3.x before 2.3.6 allows remote authenticated users to cause a denial of service (server crash) via a small control channel packet.
Why this priority
- On your watchlist
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 6.8 (Medium) |
| EPSS exploit chance | 3.5% (top 11%) |
| CISA exploited list | No |
| Weakness | CWE-399 |
| Published | 2014-12-03 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
mageia mageia MITIGATE
Affected: 4.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 4.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
debian debian linux MITIGATE
Affected: 7.0 · 8.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
opensuse opensuse MITIGATE
Affected: 12.3 · 13.1 · 13.2
Fixed in: no fixed release known
Safe to downgrade to: a release before 12.3
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
openvpn openvpn DOWNGRADE
Affected: 2.0.1_rc1 · 2.0.1_rc2 · 2.0.1_rc3 · 2.0.1_rc4 · 2.0.1_rc5 · 2.0.1_rc6 · 2.0.1_rc7 · 2.0.2_rc1
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.0.1_rc1
1. Check installed version
apt-cache policy openvpn || rpm -q openvpn || openvpn --version
2. No fixed release: DOWNGRADE to a release before 2.0.1_rc1 (Debian / Ubuntu)
apt-cache madison openvpn
sudo apt install openvpn=<VERSION_BEFORE_2.0.1_rc1>
sudo apt-mark hold openvpn
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list openvpn
sudo dnf downgrade openvpn-<VERSION_BEFORE_2.0.1_rc1>
sudo dnf versionlock add openvpn
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.
openvpn openvpn access server DOWNGRADE
Affected: 2.0.0 · 2.0.1 · 2.0.2 · 2.0.3 · 2.0.5 · 2.0.6 · 2.0.7 · 2.0.8
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.0.0
1. Check installed version
apt-cache policy openvpn-access-server || rpm -q openvpn-access-server || openvpn-access-server --version
2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)
apt-cache madison openvpn-access-server
sudo apt install openvpn-access-server=<VERSION_BEFORE_2.0.0>
sudo apt-mark hold openvpn-access-server
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list openvpn-access-server
sudo dnf downgrade openvpn-access-server-<VERSION_BEFORE_2.0.0>
sudo dnf versionlock add openvpn-access-server
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.
canonical ubuntu linux MITIGATE
Affected: 12.04 · 14.04 · 14.10
Fixed in: no fixed release known
Safe to downgrade to: a release before 12.04
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
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.
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-2014-8104?
mageia: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation; opensuse: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2014-8104 being exploited?
CVE-2014-8104 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-2014-8104 affect?
CVE-2014-8104 affects mageia, debian linux, opensuse. Severity is medium (CVSS 6.8). OpenVPN 2.x before 2.0.11, 2.1.x, 2.2.x before 2.2.3, and 2.3.x before 2.3.6 allows remote authenticated users to cause a denial of service (server crash) via a small control channel packet.
How urgent is CVE-2014-8104?
Priority 51/100. On your watchlist
Software pages
Ubuntu vulnerabilities · Debian vulnerabilities · OpenVPN vulnerabilities
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