How severe is CVE-2023-42805?

CVE-2023-42805 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-2023-42805 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-42805?

CVE-2023-42805 affects Quinn Project Quinn. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-42805?

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-2023-42805 published?

CVE-2023-42805 was published on 2023-09-21 and last updated on 2026-06-17.

CVE-2023-42805

CVE-2023-42805 is a high-severity vulnerability in Quinn Project Quinn with a CVSS 3.x base score of 7.5. 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Quinn Project Quinn
Published: 2023-09-21
Last modified: 2026-06-17

Description

quinn-proto is a state machine for the QUIC transport protocol. Prior to versions 0.9.5 and 0.10.5, receiving unknown QUIC frames in a QUIC packet could result in a panic. The problem has been fixed in 0.9.5 and 0.10.5 maintenance releases.

Frequently asked questions

What is CVE-2023-42805?: quinn-proto is a state machine for the QUIC transport protocol. Prior to versions 0.9.5 and 0.10.5, receiving unknown QUIC frames in a QUIC packet could result in a panic. The problem has been fixed in 0.9.5 and 0.10.5 maintenance releases.
How severe is CVE-2023-42805?: CVE-2023-42805 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-2023-42805 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-42805?: CVE-2023-42805 affects Quinn Project Quinn. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-42805?: 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-2023-42805 published?: CVE-2023-42805 was published on 2023-09-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:quinn_project:quinn:*:*:*:*:*:rust:*:*

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