How severe is CVE-2023-22477?

CVE-2023-22477 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2023-22477 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-22477?

CVE-2023-22477 affects Mercurius Project Mercurius. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-22477?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-22477 published?

CVE-2023-22477 was published on 2023-01-09 and last updated on 2026-06-17.

CVE-2023-22477

CVE-2023-22477 is a medium-severity vulnerability in Mercurius Project Mercurius with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-248.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-248
Affected product: Mercurius Project Mercurius
Published: 2023-01-09
Last modified: 2026-06-17

Description

Mercurius is a GraphQL adapter for Fastify. Any users of Mercurius until version 10.5.0 are subjected to a denial of service attack by sending a malformed packet over WebSocket to `/graphql`. This issue was patched in #940. As a workaround, users can disable subscriptions.

Frequently asked questions

What is CVE-2023-22477?: Mercurius is a GraphQL adapter for Fastify. Any users of Mercurius until version 10.5.0 are subjected to a denial of service attack by sending a malformed packet over WebSocket to `/graphql`. This issue was patched in #940. As a workaround, users can disable subscriptions.
How severe is CVE-2023-22477?: CVE-2023-22477 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2023-22477 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-22477?: CVE-2023-22477 affects Mercurius Project Mercurius. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-22477?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-22477 published?: CVE-2023-22477 was published on 2023-01-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mercurius_project:mercurius:*:*:*:*:*:node.js:*:*

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