CVE-2013-4211

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because EPSS predicts 88% probability of exploitation within the next 30 days (top 0.5% of all CVEs). NVD baseline CVSS 9.8 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Weaponized
9.8
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 76%
CISA-KEV: Not listedEPSS: 76%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

CVSS v3
9.8
EG Score
9.8(high)
EPSS
99.5%
KEV
Not listed

Published

February 14, 2020

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Jun 10, 2026
No patch confirmed yet.
generic

Packet Storm

https://packetstormsecurity.com/files/cve/CVE-2013-4211
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/86259
generic
http://www.securityfocus.com/bid/61650
generic

oss-security - Re: OpenX Ad Server Backdoor CVE?

http://www.openwall.com/lists/oss-security/2013/08/07/2

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 1× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-09 19:05 UTCEPSS rescore
  2. 2026-07-04 06:27 UTCEPSS rescore
  3. 2026-07-01 15:02 UTCEPSS rescore
  4. 2026-06-30 23:19 UTCEPSS rescore
  5. 2026-06-30 23:19 UTCEPSS rescore
  6. 2026-06-29 14:02 UTCEPSS rescore
  7. 2026-06-28 04:53 UTCEPSS rescore
  8. 2026-06-28 04:53 UTCEPSS rescore
  9. 2026-06-25 13:46 UTCEPSS rescore
  10. 2026-06-24 14:02 UTCEPSS rescore
  11. 2026-06-24 14:02 UTCEPSS rescore
  12. 2026-06-23 21:30 UTCEPSS rescore
  13. 2026-06-21 01:57 UTCEPSS rescore
  14. 2026-06-21 01:56 UTCEPSS rescore
  15. 2026-06-18 17:49 UTCEPSS rescore
  16. 2026-06-18 17:49 UTCEPSS rescore
  17. 2026-06-16 17:49 UTCEPSS rescore
  18. 2026-06-16 17:49 UTCEPSS rescore
  19. 2026-06-15 17:44 UTCEPSS rescore
  20. 2026-06-13 22:57 UTCEPSS rescore
  21. 2026-06-12 23:08 UTCEPSS rescore
  22. 2026-06-10 13:18 UTCEPSS rescore
  23. 2026-06-08 14:14 UTCEPSS rescore
  24. 2026-06-07 15:22 UTCEPSS rescore
  25. 2026-06-05 22:44 UTCEPSS rescore
Show 10 more
  1. 2026-06-05 22:44 UTCEPSS rescore
  2. 2026-05-29 13:41 UTCEPSS rescore
  3. 2026-05-29 13:41 UTCEPSS rescore
  4. 2026-05-28 13:42 UTCEPSS rescore
  5. 2026-05-28 13:42 UTCEPSS rescore
  6. 2026-05-28 13:42 UTCEPSS rescore
  7. 2026-05-27 07:38 UTCEG score recompute
  8. 2026-05-27 07:38 UTCGHSA enrichment
  9. 2026-05-26 07:16 UTCEPSS rescore
  10. 2026-05-26 07:16 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-27529✓ verified
    First seen Aug 12, 2013

    OpenX - Backdoor PHP Code Execution (Metasploit)

    Open source ↗
  • Metasploitexploit/multi/http/openx_backdoor_php✓ verified
    First seen Aug 7, 2013

    OpenX Backdoor PHP Code Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2013-4211?
CVE-2013-4211 is a critical vulnerability published on February 14, 2020. 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
When was CVE-2013-4211 disclosed?
CVE-2013-4211 was first published in the National Vulnerability Database on February 14, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-4211 actively exploited?
CVE-2013-4211 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2013-4211?
CVE-2013-4211 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2013-4211?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-4211, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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