CVE-2025-12977
Quick assessment
Affected
FluentBit Fluent Bit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Fluent Bit是Fluent开源的一款使用C语言编写的开源日志处理和分析系统。 Fluent Bit存在安全漏洞，该漏洞源于未清理tag_key输入，可能导致换行注入、路径遍历或日志误路由。
Possible ATT&CK Techniques 2 AI
T1048 · Exfiltration Over Alternative Protocol T1078 · Valid Accounts
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I. Basic Information for CVE-2025-12977
Vulnerability Information
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Vulnerability Title
CVE-2025-12977
Source: CVE Program / CVE List V5
Vulnerability Description
Fluent Bit in_http, in_splunk, and in_elasticsearch input plugins fail to sanitize tag_key inputs. An attacker with network access or the ability to write records into Splunk or Elasticsearch can supply tag_key values containing special characters such as newlines or ../ that are treated as valid tags. Because tags influence routing and some outputs derive filenames or contents from tags, this can allow newline injection, path traversal, forged record injection, or log misrouting, impacting data integrity and log routing.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Fluent Bit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fluent Bit是Fluent开源的一款使用C语言编写的开源日志处理和分析系统。 Fluent Bit存在安全漏洞，该漏洞源于未清理tag_key输入，可能导致换行注入、路径遍历或日志误路由。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| FluentBit | Fluent Bit | 0 ~ 4.0.12 | - |
|
II. Public POCs for CVE-2025-12977
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Security Blog Posts for CVE-2025-12977 (2)
Same Patch Batch · FluentBit · 2025-11-24 · 5 CVEs total
| CVE-2025-12978 | CVE-2025-12978 | |
| CVE-2025-12972 | CVE-2025-12972 | |
| CVE-2025-12969 | CVE-2025-12969 | |
| CVE-2025-12970 | CVE-2025-12970 |
IV. Related Vulnerabilities
V. Comments for CVE-2025-12977
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