How severe is CVE-2023-30591?

CVE-2023-30591 has a CVSS 3.x base score of 7.5, rated high 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 high.

Is CVE-2023-30591 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 54% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-30591?

CVE-2023-30591 affects Nodebb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-30591?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-30591 published?

CVE-2023-30591 was published on 2023-09-29 and last updated on 2026-06-17.

CVE-2023-30591

CVE-2023-30591 is a high-severity vulnerability in Nodebb with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 54% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-754.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 54% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-754
Affected product: Nodebb
Published: 2023-09-29
Last modified: 2026-06-17

Description

Denial-of-service in NodeBB <= v2.8.10 allows unauthenticated attackers to trigger a crash, when invoking `eventName.startsWith()` or `eventName.toString()`, while processing Socket.IO messages via crafted Socket.IO messages containing array or object type for the event name respectively.

Frequently asked questions

What is CVE-2023-30591?: Denial-of-service in NodeBB <= v2.8.10 allows unauthenticated attackers to trigger a crash, when invoking `eventName.startsWith()` or `eventName.toString()`, while processing Socket.IO messages via crafted Socket.IO messages containing array or object type for the event name respectively.
How severe is CVE-2023-30591?: CVE-2023-30591 has a CVSS 3.x base score of 7.5, rated high 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 high.
Is CVE-2023-30591 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 54% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-30591?: CVE-2023-30591 affects Nodebb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-30591?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-30591 published?: CVE-2023-30591 was published on 2023-09-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nodebb:nodebb:*:*:*:*:*:*:*:*

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