CVE-2013-4211: A Code Execution Vulnerability exists in OpenX Ad Server 2.8.10 due to a backdoor in flowplayer-3.1.1.min.js l

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2013-4211 is a critical-severity flaw (CVSS 9.8) affecting openx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Code Execution Vulnerability exists in OpenX Ad Server 2.8.10 due to a backdoor in flowplayer-3.1.1.min.js library, which could let a remote malicious user execute arbitrary PHP code

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	70.7% (top 1%)
CISA exploited list	No
Weakness	CWE-94
Published	2020-02-14
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: openx

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

Am I affected?

Timeline

2020-02-14 20:15 UTCPublished CVE record published
2026-06-16 23:56 UTCUpdated Record last modified

openx openx DOWNGRADE

Affected: 2.8.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.8.10

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.8.10 (Debian / Ubuntu)

apt-cache madison openx sudo apt install openx=<VERSION_BEFORE_2.8.10> sudo apt-mark hold openx

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

dnf --showduplicates list openx sudo dnf downgrade openx-<VERSION_BEFORE_2.8.10> sudo dnf versionlock add openx

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: OpenX - Backdoor PHP Code Execution (Metasploit)
Metasploit: OpenX Backdoor PHP Code Execution

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-2013-4211?

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

Is CVE-2013-4211 being exploited?

CVE-2013-4211 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-2013-4211 affect?

CVE-2013-4211 affects openx. Severity is critical (CVSS 9.8). A Code Execution Vulnerability exists in OpenX Ad Server 2.8.10 due to a backdoor in flowplayer-3.1.1.min.js library, which could let a remote malicious user execute arbitrary PHP code

How urgent is CVE-2013-4211?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

References

← Back to latest CVEs