CVE-2023-42805Network attack vector

Unauthenticated server crash via unknown frame parsing

Published Sep 21, 2023 · Updated Sep 24, 2024

Improper input validation in quinn-proto in Quinn before 0.9.5 and 0.10.0 through 0.10.4 allows remote attackers to crash server processes. The frame iterator converted a decoding error into Frame::Invalid by unconditionally unwrapping last_ty, which is absent for an unknown frame type. A crafted unauthenticated QUIC packet reaches this path over the network, panicking the hosting server process without affecting confidentiality or integrity.

CVSS severity7.5
High
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in quinn-proto in Quinn before 0.9.5 and 0.10.0 through 0.10.4 allows remote attackers to crash server processes. The frame iterator converted a decoding error into Frame::Invalid by unconditionally unwrapping last_ty, which is absent for an unknown frame type. A crafted unauthenticated QUIC packet reaches this path over the network, panicking the hosting server process without affecting confidentiality or integrity.

The record

CVE
CVE-2023-42805
Published
Sep 21, 2023
Updated
Sep 24, 2024
Vendor
Quinn Project
Product
Quinn
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.9.5
  2. Affected versionversion=>= 0.10.0, < 0.10.5
  3. Affected versionversion=0.10.0 <0.10.5
  4. Affected versionversion=< 0.9.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Quinn Project · Quinnversion=0 <0.9.5; version=>= 0.10.0, < 0.10.5; version=0.10.0 <0.10.5; version=< 0.9.5

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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