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CVE-2023-6180

16
FAUCET Score

CVE-2023-6180 is a memory leak vulnerability in version 4.0.0 of the tokio-boring library, specifically impacting products like Cloudflare Boring. The flaw, rated Medium severity (CVSS 5.3), stems from the set_ex_data function failing to deallocate memory after TLS connections, leading to resource exhaustion and potential Denial of Service. While the attack vector is network-based and low complexity, it only impacts availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
4.0.0CPE matchmatch criteria
cpe:2.3:a:cloudflare:boring:4.0.0:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.62%
Probability of exploitation in next 30 days
EPSS Percentile
46.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0062 is in the 29th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (2)

rustpatch availablevia ghsa
Product: tokio-boringFixed in: 4.1.0
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

rustGHSA-pjrj-h4fg-6gm4medium

tokio-boring vulnerable to resource exhaustion via memory leak

Dec 5, 2023

References

github.com / cloudflare/boring/security/advisories/GHSA-pjrj-h4fg-6gm4
Vendor Advisory