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Collection Degraded30 / 46 Sources HealthyPublic Intel Only
Vulnerabilities/CVE-2021-3326Public Intelligence Dossier
Source: gnu · Limited verification•Last verified: •Collection Degraded
CVE-2021-3326Unknown / EvaluatingHIGH (raw)CVSS 7.5CWE-617

The iconv function in the GNU C Library (aka glibc or libc6) 2.32 and earlier, when processing invalid input sequences in the ISO-2022-JP-3 encoding, fails an assertion in the code path and aborts the program, potentially resulting in a denial of service.

Published: 28 Jan 2021•Last updated: 14 Oct 2026, 03:47 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
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
3.8%0.038
Percentile90th
Weakness type
CWE-617
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

The iconv function in the GNU C Library (aka glibc or libc6) 2.32 and earlier, when processing invalid input sequences in the ISO-2022-JP-3 encoding, fails an assertion in the code path and aborts the program, potentially resulting in a denial of service.

SOC priority

High

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: Microsoft or Microsoft-managed product relevance; HIGH severity; No confirmed exploitation signal in current enrichment

Affected Products & Remediation

11 source-backed products
Affected products and versions (source)
  • gnu glibc · <= 2.32.0 · NVD CPE · Source
  • netapp e-series santricity os controller · >= 11.0 <= 11.60.3 · NVD CPE · Source
  • netapp ontap select deploy administration utility · version range not provided by source · NVD CPE · Source
  • oracle communications cloud native core security edge protection proxy · 1.5.0 · NVD CPE · Source
  • fujitsu m10-1 firmware · < xcp2410; < xcp3110 · NVD CPE · Source
  • fujitsu m10-4 firmware · < xcp2410; < xcp3110 · NVD CPE · Source
  • fujitsu m10-4s firmware · < xcp2410; < xcp3110 · NVD CPE · Source
  • fujitsu m12-1 firmware · < xcp2410; < xcp3110 · NVD CPE · Source
  • fujitsu m12-2 firmware · < xcp2410; < xcp3110 · NVD CPE · Source
  • fujitsu m12-2s firmware · < xcp2410; < xcp3110 · NVD CPE · Source
  • debian debian linux · 10.0 · NVD CPE · Source
NVD applicability prerequisites: cpe:2.3:h:fujitsu:m10-1:-:*:*:*:*:*:*:*, cpe:2.3:h:fujitsu:m10-4:-:*:*:*:*:*:*:*, cpe:2.3:h:fujitsu:m10-4s:-:*:*:*:*:*:*:*, cpe:2.3:h:fujitsu:m12-1:-:*:*:*:*:*:*:*, cpe:2.3:h:fujitsu:m12-2:-:*:*:*:*:*:*:*, cpe:2.3:h:fujitsu:m12-2s:-:*:*:*:*:*:*:*. 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:gnu:glibc:*:*:*:*:*:*:*:*, cpe:2.3:a:netapp:e-series_santricity_os_controller:*:*:*:*:*:*:*:*, cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*, cpe:2.3:a:oracle:communications_cloud_native_core_security_edge_protection_proxy:1.5.0:*:*:*:*:*:*:*, cpe:2.3:o:fujitsu:m10-1_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:fujitsu:m10-1:-:*:*:*:*:*:*:*, cpe:2.3:o:fujitsu:m10-4_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:fujitsu:m10-4:-:*:*:*:*:*:*:*, cpe:2.3:o:fujitsu:m10-4s_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:fujitsu:m10-4s:-:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
oracle.comSource recordnvd.nist.govSource recordlists.debian.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-2021-3326
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2021-3326
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2021-3326"| 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.