CVE-2021-46878

HIGH EPSS 26.9%
Published Apr 11, 20233y ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Apr 11, 2023 3y ago
Last Modified Jun 17, 2026 2w ago

Description

An issue was discovered in Treasure Data Fluent Bit 1.7.1, erroneous parsing in flb_pack_msgpack_to_json_format leads to type confusion bug that interprets whatever is on the stack as msgpack maps and arrays, leading to use-after-free. This can be used by an attacker to craft a specially craft file and trick the victim opening it using the affect software, triggering use-after-free and execute arbitrary code on the target system.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
26.9% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-843

Affected Products 1

VendorProductVersionRange
treasuredatafluent_bit1.7.1any

References 2

  • bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27742
    ExploitIssue TrackingPatchThird Party Advisory
  • github.com https://github.com/fluent/fluent-bit/pull/3115
    Patch

Remediation

  • bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27742
    ExploitIssue TrackingPatchThird Party Advisory
  • github.com https://github.com/fluent/fluent-bit/pull/3115
    Patch