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CVE-2020-35963

24
FAUCET Score

CVE-2020-35963 is an out-of-bounds write vulnerability in Fluent Bit versions prior to 1.6.4, specifically within the flb_gzip_compress function, due to incorrect calculation of gzip data-size expansion. This flaw affects Fluent Bit on both Linux and Treasure Data platforms. With a CVSS score of 7.8 (High), successful exploitation, requiring user interaction, could lead to high impact on confidentiality, integrity, and availability. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.6.4CPE matchmatch criteria
cpe:2.3:a:treasuredata:fluent_bit:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.31%
Probability of exploitation in next 30 days
EPSS Percentile
67.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0131 is in the 65th percentile among its peer group of 11,621 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2020-35963Moderate

fluent-bit: Out of bounds write in flb_gzip_compress in flb_gzip.c

Apr 29, 2021

References

bugs.chromium.org / p/oss-fuzz/issues/detail
ExploitIssue TrackingThird Party Advisory
fluentbit.io / announcements/v1.6.4
Release NotesVendor Advisory
github.com / fluent/fluent-bit/commit/cadff53c093210404aed01c4cf586adb8caa07af
PatchThird Party Advisory