CVE-2009-0841

HIGHCVSS v2 · 10.010.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 10.0 — v2 rates that HIGH (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:L/Au:N/C:C/I:C/A:C. 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 5.3% 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 week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5%CVSS v2: 10.0Exploit: None knownExposed: 0

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

Directory traversal vulnerability in mapserv.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2, when running on Windows with Cygwin, allows remote attackers to create arbitrary files via a .. (dot dot) in the id parameter.

CVSS v2.0 (legacy)
10.0HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
10.0(low)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity100% × 45%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
5%
EPSS %ILE
92%
KEV
Not listed

Published

March 31, 2009

Last Modified

April 23, 2026

References (24)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 33× 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 101 total refreshes for this CVE.

  1. 2026-07-26 13:37 UTCEG score recompute▲ 10.00
  2. 2026-07-25 14:12 UTCEPSS rescore
  3. 2026-07-25 00:11 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
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  10. 2026-07-22 14:03 UTCEPSS rescore
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  24. 2026-07-07 19:12 UTCOSV refresh
  25. 2026-07-06 16:23 UTCEPSS rescore
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  22. 2026-06-19 06:55 UTCOSV refresh
  23. 2026-06-18 17:49 UTCEPSS rescore
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  54. 2026-05-31 00:13 UTCEPSS rescore
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  56. 2026-05-30 17:29 UTCEG score recompute
  57. 2026-05-30 17:29 UTCGHSA enrichment
  58. 2026-05-29 13:40 UTCEPSS rescore
  59. 2026-05-28 18:36 UTCOSV refresh
  60. 2026-05-28 13:42 UTCEPSS rescore
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Frequently asked(4)

What is CVE-2009-0841?
CVE-2009-0841 is a high vulnerability published on March 31, 2009. Directory traversal vulnerability in mapserv.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2, when running on Windows with Cygwin, allows remote attackers to create arbitrary files via a .. (dot dot) in the id parameter.
When was CVE-2009-0841 disclosed?
CVE-2009-0841 was first published in the National Vulnerability Database on March 31, 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-2009-0841 actively exploited?
CVE-2009-0841 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5% probability of exploitation in the next 30 days, which ranks it in the top 8.3% of all scored CVEs.
How do I remediate CVE-2009-0841?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-0841, 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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