CVE-2021-43396 (GCVE-0-2021-43396)

Vulnerability from cvelistv5 – Published: 2021-11-04 19:52 – Updated: 2026-10-14 11:53 Disputed
VLAI
Summary
In iconvdata/iso-2022-jp-3.c in the GNU C Library (aka glibc) 2.34, remote attackers can force iconv() to emit a spurious '\0' character via crafted ISO-2022-JP-3 data that is accompanied by an internal state reset. This may affect data integrity in certain iconv() use cases. NOTE: the vendor states "the bug cannot be invoked through user input and requires iconv to be invoked with a NULL inbuf, which ought to require a separate application bug to do so unintentionally. Hence there's no security impact to the bug.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
  • n/a
Assigner
mitre CNA under the mitre root
CNA scorecard E 29/100 over 2362 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Show details on NVD website
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                    "vulnerable": true
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                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [
          {
            "sourceIdentifier": "cve@mitre.org",
            "tags": [
              "disputed"
            ]
          }
        ],
        "descriptions": [
          {
            "lang": "en",
            "value": "In iconvdata/iso-2022-jp-3.c in the GNU C Library (aka glibc) 2.34, remote attackers can force iconv() to emit a spurious \u0027\\0\u0027 character via crafted ISO-2022-JP-3 data that is accompanied by an internal state reset. This may affect data integrity in certain iconv() use cases. NOTE: the vendor states \"the bug cannot be invoked through user input and requires iconv to be invoked with a NULL inbuf, which ought to require a separate application bug to do so unintentionally. Hence there\u0027s no security impact to the bug."
          },
          {
            "lang": "es",
            "value": "** EN DISPUTA ** En el archivo iconvdata/iso-2022-jp-3.c de la Biblioteca C de GNU (tambi\u00e9n conocida como glibc) 2.34, los atacantes remotos pueden forzar a iconv() a emitir un car\u00e1cter espurio \u0027\\0\u0027 a trav\u00e9s de datos ISO-2022-JP-3 manipulados que van acompa\u00f1ados de un reinicio de estado interno. Esto puede afectar a la integridad de los datos en ciertos casos de uso de iconv(). NOTA: el proveedor afirma que \"el fallo no puede ser invocado a trav\u00e9s de la entrada del usuario y requiere que iconv sea invocado con un inbuf NULL, lo que deber\u00eda requerir un fallo de aplicaci\u00f3n separado para hacerlo involuntariamente. Por lo tanto, el fallo no tiene impacto en la seguridad\"."
          }
        ],
        "id": "CVE-2021-43396",
        "lastModified": "2026-10-14T12:17:16.160",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
              "cvssData": {
                "accessComplexity": "LOW",
                "accessVector": "NETWORK",
                "authentication": "NONE",
                "availabilityImpact": "NONE",
                "baseScore": 5.0,
                "confidentialityImpact": "NONE",
                "integrityImpact": "PARTIAL",
                "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
                "version": "2.0"
              },
              "exploitabilityScore": 10.0,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
              "type": "Primary",
              "userInteractionRequired": false
            }
          ],
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2021-11-04T20:15:09.223",
        "references": [
          {
            "source": "cve@mitre.org",
            "tags": [
              "Exploit",
              "Third Party Advisory"
            ],
            "url": "https://blog.tuxcare.com/vulnerability/vulnerability-in-iconv-identified-by-tuxcare-team-cve-2021-43396"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Exploit",
              "Issue Tracking",
              "Third Party Advisory"
            ],
            "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=28524"
          },
          {
            "source": "cve@mitre.org",
            "url": "https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=ff012870b2c02a62598c04daa1e54632e020fd7d"
          },
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              "Third Party Advisory"
            ],
            "url": "https://www.oracle.com/security-alerts/cpujul2022.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Exploit",
              "Third Party Advisory"
            ],
            "url": "https://blog.tuxcare.com/vulnerability/vulnerability-in-iconv-identified-by-tuxcare-team-cve-2021-43396"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
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              "Issue Tracking",
              "Third Party Advisory"
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            "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=28524"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=ff012870b2c02a62598c04daa1e54632e020fd7d"
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          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"
          }
        ],
        "sourceIdentifier": "cve@mitre.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2025-11-21T15:46:13+00:00",
      "cve": "CVE-2021-43396",
      "id": "CVE-2021-43396",
      "initial_release_date": "2021-11-01T00:00:00+00:00",
      "product_status:known_not_affected": "451",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "glibc: conversion from ISO-2022-JP-3 with iconv may emit spurious NUL character on state reset",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-43396.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-17T01:34:11Z",
      "cve": "CVE-2021-43396",
      "id": "CVE-2021-43396",
      "initial_release_date": "2023-02-15T03:36:59Z",
      "product_status:known_affected": "0",
      "product_status:known_not_affected": "219",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-43396",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2023/cve-2021-43396.json",
      "version": "29"
    }
  }
}



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