CVE-2009-0543

MEDIUMCVSS v2 · 6.86.8—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 6.8 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:M/Au:N/C:P/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 18.7% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Trending — 3 sources updated this weekWeaponized
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 19%CVSS v2: 6.8Exploit: Exploit-DB (verified) · epss top5pct · public exploitExposed: 0

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

ProFTPD Server 1.3.1, with NLS support enabled, allows remote attackers to bypass SQL injection protection mechanisms via invalid, encoded multibyte characters, which are not properly handled in (1) mod_sql_mysql and (2) mod_sql_postgres.

CVSS v2.0 (legacy)
6.8MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
6.8(low)
EG Risk
61(Track)
EG Risk 61/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity68% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
19%
EPSS %ILE
97%
KEV
Not listed

Published

February 12, 2009

Last Modified

April 23, 2026

References (14)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 35× 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.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-07-26 13:37 UTCEG score recompute▲ 6.80
  2. 2026-07-25 14:12 UTCEPSS rescore
  3. 2026-07-25 01:41 UTCOSV refresh
  4. 2026-07-24 14:12 UTCEPSS rescore
  5. 2026-07-23 14:14 UTCEPSS rescore
  6. 2026-07-23 00:58 UTCEG score recompute
  7. 2026-07-23 00:36 UTCEG score recompute
  8. 2026-07-23 00:03 UTCEG score recompute
  9. 2026-07-22 21:42 UTCEG score recompute
  10. 2026-07-22 14:03 UTCEPSS rescore
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  24. 2026-07-07 20:41 UTCOSV refresh
  25. 2026-07-06 16:23 UTCEPSS rescore
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  1. 2026-07-05 02:26 UTCEPSS rescore
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  23. 2026-06-19 08:25 UTCOSV refresh
  24. 2026-06-18 17:49 UTCEPSS rescore
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  53. 2026-05-31 22:28 UTCEPSS rescore
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  55. 2026-05-31 00:13 UTCEPSS rescore
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  57. 2026-05-30 18:15 UTCEG score recompute
  58. 2026-05-30 18:15 UTCGHSA enrichment
  59. 2026-05-29 13:40 UTCEPSS rescore
  60. 2026-05-28 20:06 UTCOSV refresh
  61. 2026-05-28 13:42 UTCEPSS rescore
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  75. 2026-05-20 11:21 UTCEPSS rescore

Publicly available exploits

(1 reference)

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

  • Exploit-DBEDB-8037✓ verified
    First seen Feb 10, 2009

    ProFTPd - 'mod_mysql' Authentication Bypass

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2009-0543?
CVE-2009-0543 is a medium vulnerability published on February 12, 2009. ProFTPD Server 1.3.1, with NLS support enabled, allows remote attackers to bypass SQL injection protection mechanisms via invalid, encoded multibyte characters, which are not properly handled in (1) modsqlmysql and (2) modsqlpostgres.
When was CVE-2009-0543 disclosed?
CVE-2009-0543 was first published in the National Vulnerability Database on February 12, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-0543 actively exploited?
CVE-2009-0543 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19% probability of exploitation in the next 30 days, which ranks it in the top 3.0% of all scored CVEs.
How do I remediate CVE-2009-0543?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-0543, 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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