CVE-2024-45311: Quinn is a pure-Rust, async-compatible implementation of the IETF QUIC transport protocol

This month

HIGH 7.5REMOTEUPGRADE

CVE-2024-45311 is a high-severity flaw (CVSS 7.5) affecting quinn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Quinn is a pure-Rust, async-compatible implementation of the IETF QUIC transport protocol. As of quinn-proto 0.11, it is possible for a server to `accept()`, `retry()`, `refuse()`, or `ignore()` an `Incoming` connection. However, calling `retry()` on an unvalidated connection exposes the server to a likely panic in the following situations: 1. Calling `refuse` or `ignore` on the resulting validated connection, if a duplicate initial packet is re

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-670
Published	2024-09-02
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: quinn project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-09-02 18:15 UTCPublished CVE record published
2026-06-17 07:54 UTCUpdated Record last modified

quinn project quinn UPGRADE

Affected: >= 0.11.0 and < 0.11.4

Fixed in: 0.11.4

Safe to downgrade to: a release before 0.11.0

1. Check installed version

apt-cache policy quinn || rpm -q quinn || quinn --version

2. UPGRADE to 0.11.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade quinn

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade quinn

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.11.0 (Debian / Ubuntu)

apt-cache madison quinn sudo apt install quinn=<VERSION_BEFORE_0.11.0> sudo apt-mark hold quinn

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list quinn sudo dnf downgrade quinn-<VERSION_BEFORE_0.11.0> sudo dnf versionlock add quinn

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-45311?

quinn: upgrade to 0.11.4. Exact commands for each OS are on this page.

Is CVE-2024-45311 being exploited?

CVE-2024-45311 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-45311 affect?

CVE-2024-45311 affects quinn. Severity is high (CVSS 7.5). Quinn is a pure-Rust, async-compatible implementation of the IETF QUIC transport protocol. As of quinn-proto 0.11, it is possible for a server to `accept()`, `retry()`, `refuse()`, or `ignore()` an `Incoming` connection. However, calling `r

How urgent is CVE-2024-45311?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-42805 HIGH 7.5 UPGRADE quinn-proto is a state machine for the QUIC transport protocol

References

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