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Vulnerabilities/CVE-2020-10531Public Intelligence Dossier
Source: icu-project · Limited verification•Last verified: •Collection Degraded
CVE-2020-10531Unknown / EvaluatingHIGH (raw)CVSS 8.8CWE-190

An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1

Published: 13 Mar 2020•Last updated: 14 Oct 2026, 02:47 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
8.8HIGH (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Metric sourcenvd@nist.gov
EPSS probability
2.7%0.027
Percentile86th
Weakness type
CWE-190
CWE-787
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.

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

11 source-backed products
Affected products and versions (source)
  • icu-project international components for unicode · <= 66.1 · NVD CPE · Source
  • redhat enterprise linux desktop · 6.0 · NVD CPE · Source
  • redhat enterprise linux server · 6.0 · NVD CPE · Source
  • redhat enterprise linux workstation · 6.0 · NVD CPE · Source
  • google chrome · < 80.0.3987.122 · NVD CPE · Source
  • fedoraproject fedora · 30; 31; 33 · 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
  • opensuse leap · 15.1 · NVD CPE · Source
  • oracle banking extensibility workbench · 14.3.0; 14.4.0 · NVD CPE · Source
  • nodejs node.js · >= 10.0.0 <= 10.12.0; >= 10.13.0 < 10.21.0 · 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 user-interaction-client (CVSS AV:N, CVSS UI:R)

Exposure

  1. Identify endpoints reporting this CVE, especially those used for email and web browsing.Telemetry: DeviceTvmSoftwareVulnerabilities · A network vector that needs user interaction points at user-facing client software. · Rule user-interaction-client

Exploitation evidence

  1. Review unusual child processes started by the affected client application on affected endpoints.Telemetry: DeviceProcessEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule user-interaction-client

Response

  1. Confirm the source-stated update on affected endpoints.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule user-interaction-client

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:icu-project:international_components_for_unicode:*:*:*:*:*:c\/c\+\+:*:*, cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*, cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*, cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*, cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
chromium.googlesource.comSource recordnvd.nist.govSource recordaccess.redhat.comSource 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-2020-10531
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2020-10531
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2020-10531"| 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.