HighFix available

bash — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2012-6711

A heap-based buffer overflow exists in GNU Bash before 4.3 when wide characters, not supported by the current locale set in the LC_CTYPE environment variable, are printed through the echo built-in function. A local attacker, who can provide data to print through the "echo -e" built-in function, may use this flaw to crash a script or execute code with the privileges of the bash process. This occurs because ansicstr() in lib/sh/strtrans.c mishandles u32cconv().

Products: bash
Affected versions: Not specified
Fixed versions: 4.3-1
CVEs: CVE-2012-6711
Confirmed fixed CVEs: Not specified
Updated in this feed: 1 Nov 2026, 00:02 UTC · Revision 1

Source evidence

DEBIAN-CVE-2012-6711

core-osv · Original source

Published 18 Jun 2019, 18:15 UTC

osv:DEBIAN-CVE-2012-6711

bash

Fixed versions: 4.3-1

bash

Fixed versions: 4.3-1

bash

Fixed versions: 4.3-1

Complete source record

{
  "id": "61c0d7314d763ba7df3447e94d098cd7849f71c81954aeeb2a64eed1506f5429",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2012-6711",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2012-6711",
    "summary": "A heap-based buffer overflow exists in GNU Bash before 4.3 when wide characters, not supported by the current locale set in the LC_CTYPE environment variable, are printed through the echo built-in function. A local attacker, who can provide data to print through the \"echo -e\" built-in function, may use this flaw to crash a script or execute code with the privileges of the bash process. This occurs because ansicstr() in lib/sh/strtrans.c mishandles u32cconv().",
    "evidence": "osv:DEBIAN-CVE-2012-6711",
    "products": [
      {
        "name": {
          "value": "bash",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.3-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "bash",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.3-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "bash",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.3-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2012-6711",
      "aliases": [
        "DEBIAN-CVE-2012-6711"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.3-1"
                }
              ]
            }
          ],
          "package": {
            "name": "bash",
            "purl": "pkg:deb/debian/bash?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2012-6711.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.3-1"
                }
              ]
            }
          ],
          "package": {
            "name": "bash",
            "purl": "pkg:deb/debian/bash?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2012-6711.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4.3-1"
                }
              ]
            }
          ],
          "package": {
            "name": "bash",
            "purl": "pkg:deb/debian/bash?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2012-6711.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-23T18:02:55.019123786Z",
      "provider": "osv",
      "upstream": [
        "CVE-2012-6711"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2012-6711"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2012-6711",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 419793,
  "published_at": "2019-06-18T18:15:09.247+00:00"
}