What’s Vulnerable › Vulnerabilities

CVE-2021-27186

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-10 · updated 2026-06-17
• Weakness: CWE-476

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.

Affected products

• FluentBit Fluent Bit: 1.6.10

References

• https://github.com/fluent/fluent-bit/issues/3044
• https://github.com/fluent/fluent-bit/pull/3045
• https://github.com/fluent/fluent-bit/pull/3047
• https://github.com/fluent/fluent-bit/issues/3044
• https://github.com/fluent/fluent-bit/pull/3045
• https://github.com/fluent/fluent-bit/pull/3047

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