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CVE-2023-22477

19
FAUCET Score

CVE-2023-22477 is a denial-of-service vulnerability affecting Mercurius, a GraphQL adapter for Fastify, in versions prior to 10.5.0. An unauthenticated attacker can trigger this by sending a malformed WebSocket packet to the /graphql endpoint. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network with low complexity, leading to a complete denial of service. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.13.2CPE matchmatch criteria
cpe:2.3:a:mercurius_project:mercurius:*:*:*:*:*:node.js:*:*
>= 9.0.0, < 11.5.0CPE matchmatch criteria
cpe:2.3:a:mercurius_project:mercurius:*:*:*:*:*:node.js:*:*

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
1.06%
Probability of exploitation in next 30 days
EPSS Percentile
60.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0106 is in the 38th percentile among its peer group of 51,506 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: mercuriusFixed in: 11.5.0
npmpatch availablevia ghsa
Product: mercuriusFixed in: 8.13.2

Vendor Advisories (1)

npmGHSA-cm8h-q92v-xcfcmedium

mercurius has Uncaught Exception when using subscriptions

Jan 9, 2023

References

github.com / mercurius-js/mercurius/issues/939
ExploitIssue TrackingThird Party Advisory
github.com / mercurius-js/mercurius/pull/940
PatchThird Party Advisory
github.com / mercurius-js/mercurius/security/advisories/GHSA-cm8h-q92v-xcfc
PatchThird Party Advisory