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Vulnerabilities/CVE-2006-4339Public Intelligence Dossier
Source: openssl · Limited verification•Last verified: •Collection Degraded
CVE-2006-4339Unknown / EvaluatingCRITICAL (raw)CVSS 9.1CWE-347

A flaw was found in OpenSSL

Published: 05 Sept 2006•Last updated: 30 Oct 2026, 10:47 PM IST•Source identifier: secalert@redhat.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
9.1CRITICAL (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Metric sourcesecalert@redhat.com
EPSS probability
3.9%0.039
Percentile90th
Weakness type
CWE-347
CWE-310
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

A flaw was found in OpenSSL. When configured to use an RSA key with exponent 3, OpenSSL improperly removes PKCS-1 padding before generating a hash. This allows remote attackers to forge PKCS #1 v1.5 signatures. Consequently, OpenSSL may incorrectly verify X.509 and other certificates, leading to a bypass of trust and authentication mechanisms.

SOC priority

High Severity / Review

Actively exploited (source statement)

Unknown

Publicly disclosed

Unknown

Risk basis: Microsoft or Microsoft-managed product relevance; CRITICAL severity; Critical source severity without confirmed exploitation

Affected Products & Remediation

1 source-backed product
Affected products and versions (source)
  • openssl openssl · <= 0.9.7; 0.9.1c; 0.9.2b; 0.9.3; 0.9.3a; 0.9.4; 0.9.5; 0.9.5a; 0.9.6; 0.9.6a; 0.9.6b; 0.9.6c; 0.9.6d; 0.9.6e; 0.9.6f; 0.9.6g; 0.9.6h; 0.9.6i; 0.9.6j; 0.9.6k; 0.9.6l; 0.9.6m; 0.9.7a; 0.9.7b; 0.9.7c; 0.9.7d; 0.9.7e; 0.9.7f; 0.9.7g; 0.9.7h; 0.9.7i; 0.9.7j; 0.9.8; 0.9.8a; 0.9.8b · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated update is installed and the CVE is no longer reported.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule network-unauthenticated

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
secalert@redhat.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*, cpe:2.3:a:openssl:openssl:0.9.1c:*:*:*:*:*:*:*, cpe:2.3:a:openssl:openssl:0.9.2b:*:*:*:*:*:*:*, cpe:2.3:a:openssl:openssl:0.9.3:*:*:*:*:*:*:*, cpe:2.3:a:openssl:openssl:0.9.3a:*:*:*:*:*:*:*, cpe:2.3:a:openssl:openssl:0.9.4:*:*:*:*:*:*:*, cpe:2.3:a:openssl:openssl:0.9.5:*:*:*:*:*:*:*, cpe:2.3:a:openssl:openssl:0.9.5:beta1:*:*:*:*:*:*, cpe:2.3:a:openssl:openssl:0.9.5:beta2:*:*:*:*:*:*, cpe:2.3:a:openssl:openssl:0.9.5a:*:*:*:*:*:*:*

Evidence & Provenance

1 public source
nvd.nist.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2006-4339
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2006-4339
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2006-4339"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.