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High

Security advisory

Type: advisorySources: OSVCVE: CVE-2020-27153

In BlueZ before 5.55, a double free was found in the gatttool disconnect_cb() routine from shared/att.c. A remote attacker could potentially cause a denial of service or code execution, during service discovery, due to a redundant disconnect MGMT event.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2020-27153
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 12:37 UTC · Revision 1

Source evidence

CVE-2020-27153

core-osv · Original source

Published 15 Oct 2020, 03:15 UTC

In BlueZ before 5.55, a double free was found in the gatttool disconnect_cb() routine from shared/att.c. A remote attacker could potentially cause a denial of service or code execution, during service discovery, due to a redundant disconnect MGMT event.

osv:CVE-2020-27153
Complete source record
{
  "id": "89a30239ecd7feca07065f7e3791fd0212c4dc83fc9780530bd7e7f3c09f9b65",
  "url": "https://osv.dev/vulnerability/CVE-2020-27153",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-27153",
    "summary": "In BlueZ before 5.55, a double free was found in the gatttool disconnect_cb() routine from shared/att.c. A remote attacker could potentially cause a denial of service or code execution, during service discovery, due to a redundant disconnect MGMT event.",
    "evidence": "osv:CVE-2020-27153",
    "products": [],
    "severity": "high",
    "structured": {
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      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"
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      ],
      "affected": [
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          ],
          "database_specific": {
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                "source": "https://github.com/bluez/bluez/commit/1cd644db8c23a2f530ddb93cebed7dacc5f5721a",
                "target": {
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                  "function": "bt_att_cancel"
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                "source": "https://github.com/bluez/bluez/commit/1cd644db8c23a2f530ddb93cebed7dacc5f5721a",
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                  "function": "disconnect_cb"
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      "modified": "2026-10-20T14:05:19.944623434Z",
      "provider": "osv",
      "references": [
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        "https://security.gentoo.org/glsa/202011-01",
        "https://www.debian.org/security/2021/dsa-4951",
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            "vendor_product": "debian:debian_linux",
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                "source": "CPE_STRING"
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    "related_cves": [
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        "value": "CVE-2020-27153",
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  "source_id": "core-osv",
  "document_id": 388553,
  "published_at": "2020-10-15T03:15:12.12+00:00"
}