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Vulnerabilities/CVE-2019-12900Public Intelligence Dossier
Source: bzip · Limited verification•Last verified: •Collection Degraded
CVE-2019-12900Unknown / EvaluatingCRITICAL (raw)CVSS 9.8CWE-787

BZ2_decompress in decompress.c in bzip2 through 1.0.6 has an out-of-bounds write when there are many selectors.

Published: 20 Jun 2019•Last updated: 14 Oct 2026, 12:46 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
9.8CRITICAL (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metric sourcenvd@nist.gov
EPSS probability
8%0.080
Percentile95th
Weakness type
CWE-787
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

BZ2_decompress in decompress.c in bzip2 through 1.0.6 has an out-of-bounds write when there are many selectors.

SOC priority

High Severity / Review

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; CRITICAL severity; Critical CVSS without confirmed KEV exploitation

Affected Products & Remediation

6 source-backed products
Affected products and versions (source)
  • bzip bzip2 · <= 1.0.6 · NVD CPE · Source
  • debian debian linux · 8.0 · NVD CPE · Source
  • opensuse leap · 15.0; 15.1 · NVD CPE · Source
  • canonical ubuntu linux · 12.04; 14.04; 16.04; 18.04; 19.04 · NVD CPE · Source
  • freebsd freebsd · 11.2; 11.3; 12.0 · NVD CPE · Source
  • python python · >= 3.7.0 < 3.7.13; >= 3.8.0 < 3.8.13; >= 3.9.0 < 3.9.11; >= 3.10.0 < 3.10.3 · 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
cve@mitre.org
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:bzip:bzip2:*:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*, cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*, cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*, 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:19.04:*:*:*:*:*:*:*, cpe:2.3:o:freebsd:freebsd:11.2:-:*:*:*:*:*:*

Evidence & Provenance

3 public sources
gitlab.comSource recordnvd.nist.govSource 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-2019-12900
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2019-12900
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2019-12900"| 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.