CVE-2009-0033

MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — 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:L/Au:N/C:N/I:N/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 10.1% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: epss, nvd_v2
Elevated
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 10%CVSS v2: 5.0Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18, when the Java AJP connector and mod_jk load balancing are used, allows remote attackers to cause a denial of service (application outage) via a crafted request with invalid headers, related to temporary blocking of connectors that have encountered errors, as demonstrated by an error involving a malformed HTTP Host header.

CVSS v2.0 (legacy)
5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.0MEDIUMlow confidence
EG Risk
43
EG Risk 43/100CISA SSVC

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
Severity50% × 45%
Exploitation40% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track or Track* at medium and Track* or Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
10%
EPSS %ILE
95th
KEV
Not listed

CISA SSVCTrack at low, Track or Track* at medium and Track* or Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

June 5, 2009

Last Modified

April 23, 2026

References (94)

Vendor Advisories for CVE-2009-0033(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(9)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntutomcat6-examples (6.0.18-0ubuntu6.1) @ jaunty2026-05-30ubuntu
redhatxml-commons-0:1.3.02-2jpp_1rh2010-08-04redhat
redhattomcat5-0:5.5.23-0jpp_18rh2009-11-30redhat
redhattomcat5-0:5.0.30-0jpp_16rh2009-11-30redhat
redhattomcat5-0:5.5.23-0jpp_4rh.162009-11-09redhat
redhattomcat6-0:6.0.18-12.0.ep5.el52009-10-14redhat
redhattomcat5-0:5.5.23-0jpp.9.6.ep5.el52009-09-21redhat
redhattomcat5-0:5.5.23-0jpp.7.el5_3.22009-07-21redhat
mavenorg.apache.tomcat:tomcat—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
Debian:5.0(1)
PackageVulnerable rangeFix by version rangeDependents
tomcat5.55.5.26-5
  • every version up to 5.5.26-5lenny2: fixed in 5.5.26-5lenny2
—
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.apache.tomcat:tomcat—
  • 4.1.0 through 4.1.39: no fix on record
  • 5.5.0 through 5.5.27: no fix on record
  • 6.0.0 through 6.0.18: no fix on record
—

Weakness Classification(2)

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

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 15× 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 125 total refreshes for this CVE.

  1. 2026-10-09 20:00 UTCEPSS rescore
  2. 2026-10-08 16:33 UTCEPSS rescore
  3. 2026-10-07 23:37 UTCEPSS rescore
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  8. 2026-09-29 07:56 UTCEG score recompute
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  1. 2026-08-06 13:41 UTCEPSS rescore
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  3. 2026-07-30 16:22 UTCEPSS rescore
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  5. 2026-07-26 13:37 UTCEG score recompute▲ 5.00
  6. 2026-07-25 14:12 UTCEPSS rescore
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  8. 2026-07-23 14:14 UTCEPSS rescore
  9. 2026-07-23 00:58 UTCEG score recompute
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  13. 2026-07-22 14:03 UTCEPSS rescore
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  25. 2026-07-09 19:04 UTCEPSS rescore
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Frequently asked(4)

What is CVE-2009-0033?
CVE-2009-0033 is a medium vulnerability published on June 5, 2009. Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18, when the Java AJP connector and mod_jk load balancing are used, allows remote attackers to cause a denial of service (application outage) via a crafted request with invalid headers, related to temporary blocking of…
When was CVE-2009-0033 disclosed?
CVE-2009-0033 was first published on June 5, 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-2009-0033 actively exploited?
CVE-2009-0033 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10% probability of exploitation in the next 30 days (95th percentile of EPSS-scored CVEs).
How do I remediate CVE-2009-0033?
A fix for CVE-2009-0033 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2009-0033 are linked in the Vendor Advisories panel on this page.

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