CVE-2021-27186

HIGH
Published Feb 10, 20215y ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Feb 10, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

Description

Fluent Bit 1.6.10 has a NULL pointer dereference when an flb_malloc return value is not validated by flb_avro.c or http_server/api/v1/metrics.c.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 1

VendorProductVersionRange
treasuredatafluent_bit1.6.10any

References 3

  • github.com https://github.com/fluent/fluent-bit/issues/3044
    ExploitThird Party Advisory
  • github.com https://github.com/fluent/fluent-bit/pull/3045
    ExploitPatchThird Party Advisory
  • github.com https://github.com/fluent/fluent-bit/pull/3047
    PatchThird Party Advisory

Remediation

  • github.com https://github.com/fluent/fluent-bit/pull/3045
    ExploitPatchThird Party Advisory
  • github.com https://github.com/fluent/fluent-bit/pull/3047
    PatchThird Party Advisory