CVE-2021-36088

CRITICAL
Published Jul 1, 20215y ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Jul 1, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

Description

Fluent Bit (aka fluent-bit) 1.7.0 through 1.7.4 has a double free in flb_free (called from flb_parser_json_do and flb_parser_do).

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
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-415

Affected Products 1

VendorProductVersionRange
treasuredatafluent_bit*≥1.7.0  –  ≤1.7.4

References 4

  • bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750
    ExploitPatchThird Party Advisory
  • github.com https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54
    PatchThird Party Advisory
  • github.com https://github.com/fluent/fluent-bit/pull/3453
    PatchThird Party Advisory
  • github.com https://github.com/google/oss-fuzz-vulns/blob/main/vulns/fluent-bit/OSV-2021-702.yaml
    Third Party Advisory

Remediation

  • bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33750
    ExploitPatchThird Party Advisory
  • github.com https://github.com/fluent/fluent-bit/commit/22346a74c07ceb90296be872be2d53eb92252a54
    PatchThird Party Advisory
  • github.com https://github.com/fluent/fluent-bit/pull/3453
    PatchThird Party Advisory