Vulnerability Details : CVE-2021-46879
Potential exploit
An issue was discovered in Treasure Data Fluent Bit 1.7.1, a wrong variable is used to get the msgpack data resulting in a heap overflow in flb_msgpack_gelf_value_ext. An attacker can craft a malicious file and tick the victim to open the file with the software, triggering a heap overflow and execute arbitrary code on the target system.
Vulnerability category: Execute code
Products affected by CVE-2021-46879
- cpe:2.3:a:treasuredata:fluent_bit:1.7.1:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-46879
0.02%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 3 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-46879
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
134c704f-9b21-4f2e-91b3-4a467353bcc0 | 2025-02-11 |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2021-46879
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by:
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
- nvd@nist.gov (Primary)
References for CVE-2021-46879
-
https://github.com/fluent/fluent-bit/pull/3100
pack-gelf: fix OSS-Fuzz issue 5076752961110016 by DavidKorczynski · Pull Request #3100 · fluent/fluent-bit · GitHubPatch
-
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26851
26851 - fluent-bit:flb-it-fuzz-msgpack_to_gelf_fuzzer_OSSFUZZ: Heap-buffer-overflow in flb_msgpack_gelf_value_ext - oss-fuzzExploit;Issue Tracking;Patch;Third Party Advisory
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