CVE-2021-27186
HIGHCVSS 7.5/10EPSS 1.99%
Last modified
CVE-2021-27186 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.99% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Treasuredata | Fluent Bit | 1.6.10 |
References
- https://github.com/fluent/fluent-bit/issues/3044Exploit, Third Party Advisory
- https://github.com/fluent/fluent-bit/pull/3045Exploit, Patch, Third Party Advisory
- https://github.com/fluent/fluent-bit/pull/3047Patch, Third Party Advisory
- https://github.com/fluent/fluent-bit/issues/3044Exploit, Third Party Advisory
- https://github.com/fluent/fluent-bit/pull/3045Exploit, Patch, Third Party Advisory
- https://github.com/fluent/fluent-bit/pull/3047Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27186?
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.
How severe is CVE-2021-27186?
CVE-2021-27186 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.99% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27186?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-27180An issue was discovered in MDaemon before 20.0.4. There is R…6.1
- CVE-2021-27181An issue was discovered in MDaemon before 20.0.4. Remote Adm…8.8
- CVE-2021-27182An issue was discovered in MDaemon before 20.0.4. There is a…8.8
- CVE-2021-27183An issue was discovered in MDaemon before 20.0.4. Administra…7.2
- CVE-2021-27184Pelco Digital Sentry Server 7.18.72.11464 has an XML Externa…7.5
- CVE-2021-27185The samba-client package before 4.0.0 for Node.js allows com…9.8
- CVE-2021-27187The Sovremennye Delovye Tekhnologii FX Aggregator terminal c…7.5
- CVE-2021-27188The Sovremennye Delovye Tekhnologii FX Aggregator terminal c…7.5
- CVE-2021-27189The CIRA Canadian Shield app before 4.0.13 for iOS lacks SSL…5.9
- CVE-2021-27190A Stored Cross Site Scripting(XSS) Vulnerability was discove…5.4
- CVE-2021-27191The get-ip-range package before 4.0.0 for Node.js is vulnera…7.5
- CVE-2021-27192Local privilege escalation vulnerability in Windows clients …7.8
Are you affected by CVE-2021-27186?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST