CVE-2025-29785Network attack vector

Unauthenticated crash via stale path-probe tracking

Published Jun 2, 2025 · Updated Jun 2, 2025

Denial of service in quic-go 0.50.0 allows remote attackers to crash QUIC server processes with crafted path-probe ACK sequences. The sent-packet handler removes a lost path probe from one history but leaves it in normal packet history, then appends a nil probe when its ACK arrives. Exploitation requires valid packets from multiple source addresses to start path validation, followed by ACKs after probe loss; the nil dereference panics the hosting process.

CVSS severity7.5
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in quic-go 0.50.0 allows remote attackers to crash QUIC server processes with crafted path-probe ACK sequences. The sent-packet handler removes a lost path probe from one history but leaves it in normal packet history, then appends a nil probe when its ACK arrives. Exploitation requires valid packets from multiple source addresses to start path validation, followed by ACKs after probe loss; the nil dereference panics the hosting process.

The record

CVE
CVE-2025-29785
Published
Jun 2, 2025
Updated
Jun 2, 2025
Vendor
quic-go
Product
quic-go
Classifications
CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2025Record 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== 0.50.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

quic-go · quic-goversion== 0.50.0

Published CVSS scores

7.5GitHubCVSS: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.

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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-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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