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GHSA-vr26-jcq5-fjj8

HighCVSS 7.5 / 10
Published Sep 3, 2024·Last modified Feb 4, 2026
Affected Components(0)

No affected components available

Description

Summary

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:

  • Calling refuse or ignore on the resulting validated connection, if a duplicate initial packet is received
    • This issue can go undetected until a server's refuse()/ignore() code path is exercised, such as to stop a denial of service attack.
  • Accepting when the initial packet for the resulting validated connection fails to decrypt or exhausts connection IDs, if a similar initial packet that successfully decrypts and doesn't exhaust connection IDs is received.
    • This issue can go undetected if clients are well-behaved.

The former situation was observed in a real application, while the latter is only theoretical.

Details

Location of panic: https://github.com/quinn-rs/quinn/blob/bb02a12a8435a7732a1d762783eeacbb7e50418e/quinn-proto/src/endpoint.rs#L213

Impact

Denial of service for internet-facing server

Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.57%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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