mod_cluster, as used in Red Hat JBoss Web Server 2.1, allows remote attackers to cause a denial of service (Apache http server crash) via an MCMP message containing a series of = (equals) characters after a legitimate element.
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This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 3.2%, top 13% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
mod_cluster, as used in Red Hat JBoss Web Server 2.1, allows remote attackers to cause a denial of service (Apache http server crash) via an MCMP message containing a series of = (equals) characters after a legitimate element.
September 26, 2016
May 6, 2026
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | tomcat-native-0:1.1.34-5.redhat_1.ep6.el7 | 2016-10-12 | redhat |
| redhat | mod_cluster | 2016-10-12 | redhat |
| redhat | tomcat-native-0:1.1.34-5.redhat_1.ep6.el6 | 2016-10-12 | redhat |
| redhat | patch | 2016-08-22 | redhat |
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.
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| org.jboss.mod_cluster:mod_cluster-parent | 1.2.0.Beta1 ... 1.3.2.Final (28 versions) | 1.3.3.Final | — |
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.
RHSA-2016:1648 — Moderate
RHSA-2016:1649 — Moderate
RHSA-2016:1650 — Moderate
RHSA-2016:2054 — Moderate
RHSA-2016:2055 — Moderate
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
See which npm, PyPI, Go, and Maven packages are affected by CVE-2016-3110
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