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CVE-2021-3326 (GCVE-0-2021-3326)

Vulnerability from cvelistv5 – Published: 2021-01-27 00:00 – Updated: 2025-06-09 15:18
VLAI
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-09 15:17 UTC
CWE
  • n/a
  • CWE-617 - Reachable Assertion
Assigner
References
Show details on NVD website
To clipboard 

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      "initial_release_date": "2021-01-02T00:00:00.000Z",
      "product_status:fixed": "14",
      "product_status:known_affected": "14",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "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.",
      "url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-3326.json",
      "version": "1"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-03-21T01:17:05+00:00",
      "cve": "CVE-2021-3326",
      "id": "CVE-2021-3326",
      "initial_release_date": "2021-01-27T00:00:00+00:00",
      "product_status:fixed": "2598",
      "product_status:known_affected": "10",
      "product_status:known_not_affected": "226",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "glibc: Assertion failure in ISO-2022-JP-3 gconv module related to combining characters",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-3326.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T02:12:10Z",
      "cve": "CVE-2021-3326",
      "id": "CVE-2021-3326",
      "initial_release_date": "2023-02-15T03:49:39Z",
      "product_status:known_affected": "330",
      "product_status:known_not_affected": "285",
      "product_status:recommended": "1348",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-3326",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-3326.json",
      "version": "60"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2021-3326\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-06-09T15:18:04.653Z\", \"dateReserved\": \"2021-01-27T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2021-01-27T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.