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Vulnerabilities/CVE-2019-19906Public Intelligence Dossier
Source: cyrusimap · Limited verification•Last verified: •Collection Degraded
CVE-2019-19906Unknown / EvaluatingHIGH (raw)CVSS 7.5CWE-193

cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet

Published: 19 Dec 2019•Last updated: 14 Oct 2026, 01:46 PM IST•Source identifier: cve@mitre.org
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
7.5HIGH (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Metric sourcenvd@nist.gov
EPSS probability
8%0.080
Percentile95th
Weakness type
CWE-193
CWE-787
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.

SOC priority

High

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; HIGH severity; No confirmed exploitation signal in current enrichment

Affected Products & Remediation

19 source-backed products
Affected products and versions (source)
  • cyrusimap cyrus-sasl · < 2.1.28 · NVD CPE · Source
  • debian debian linux · 8.0; 9.0; 10.0 · NVD CPE · Source
  • canonical ubuntu linux · 12.04; 14.04; 16.04; 18.04; 19.10 · NVD CPE · Source
  • fedoraproject fedora · 31; 32 · NVD CPE · Source
  • redhat jboss enterprise web server · 2.0.0 · NVD CPE · Source
  • apple mac os x · 10.14.6; < 10.13.6; >= 10.13.0 < 10.13.6; >= 10.15.0 < 10.15.6; 10.13.6 · NVD CPE · Source
  • redhat enterprise linux · 5.0; 6.0; 7.0; 8.0; eus 8.4; for ibm z systems 8.0; for ibm z systems eus 8.4; for power little endian 8.0; for power little endian eus 8.4; server aus 8.4; server for power little endian update services for sap solutions 8.4; server tus 8.4; server update services for sap solutions 8.4 · NVD CPE · Source
  • redhat enterprise linux eus · 8.4 · NVD CPE · Source
  • redhat enterprise linux for ibm z systems · 8.0; eus 8.4 · NVD CPE · Source
  • redhat enterprise linux for ibm z systems eus · 8.4 · NVD CPE · Source
  • redhat enterprise linux for power little endian · 8.0; eus 8.4 · NVD CPE · Source
  • redhat enterprise linux for power little endian eus · 8.4 · NVD CPE · Source
  • redhat enterprise linux server aus · 8.4 · NVD CPE · Source
  • redhat enterprise linux server for power little endian update services for sap solutions · 8.4 · NVD CPE · Source
  • redhat enterprise linux server tus · 8.4 · NVD CPE · Source
  • redhat enterprise linux server update services for sap solutions · 8.4 · NVD CPE · Source
  • apple ipados · 13.6 · NVD CPE · Source
  • apple iphone os · 13.6 · NVD CPE · Source
  • apache bookkeeper · 4.12.1 · NVD CPE · Source
NVD applicability prerequisites: cpe:2.3:o:centos:centos:7.0:*:*:*:*:*:*:*. These are conditions, not proof that an environment is exposed or unaffected.
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
cve@mitre.org
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:cyrusimap:cyrus-sasl:*:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*, cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*, cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*, cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*, cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*, cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
nvd.nist.govSource recordgithub.comSource recordlists.apache.orgSource 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-2019-19906
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2019-19906
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2019-19906"| 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

Correlated briefings

— No published briefing references this CVE

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.