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CVE-2023-6193

17
FAUCET Score

CVE-2023-6193 affects Cloudflare's quiche library versions 0.15.0 through 0.19.0, stemming from an unbounded queuing of path validation messages. An unauthenticated remote attacker can exploit this by sending PATH_CHALLENGE frames faster than the peer can respond, leading to excessive resource consumption and a denial-of-service condition. Rated Medium (CVSS 5.3), the attack is network-based with low complexity and no user interaction required. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.15.0, <= 0.19.0CPE match
cpe:2.3:a:cloudflare:quiche:*:-:*:*:*:rust:*:*
>= 0.15.0, <= 0.19.0CPE matchmatch criteria
cpe:2.3:a:cloudflare:quiche:*:*:*:*:*:*:*:*

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
0.76%
Probability of exploitation in next 30 days
EPSS Percentile
51.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0076 is in the 32nd percentile among its peer group of 23,723 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: quicheFixed in: 0.19.1
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

rustGHSA-w3vp-jw9m-f9pmmedium

Unbounded queuing of path validation messages in cloudflare-quiche

Dec 13, 2023

References

datatracker.ietf.org / doc/html/rfc9000
Technical Description
github.com / cloudflare/quiche/security/advisories/GHSA-w3vp-jw9m-f9pm
Vendor Advisory