CVE-2020-35963
HIGH
7.8
CVSS Score
Published: January 3, 2021 at 06:15 PM UTC
Updated: June 17, 2026 at 03:14 AM UTC
1 product affected across 1 vendorFluent Bit· also runs on 1 platform
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Severity
HIGH7.8
Exploit prediction
EPSS 1%
Description
flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 1.6.4
Affected range stops below 1.6.4, so it looks safe — our inference, not a vendor statement
linux-linux-kernel (environment)
Runs on — not affected
The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (3)
x_refsource_MISCExploitIssue TrackingThird Party Advisory
Source: [email protected]
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27261x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://fluentbit.io/announcements/v1.6.4/x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/fluent/fluent-bit/commit/cadff53c093210404aed01c4cf586adb8caa07afCVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-787
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