CVE-2026-73564Public exploitNetwork attack vector

Unauthenticated service crash via wrapped exec length

Published Aug 13, 2026 · Updated Aug 13, 2026

Integer overflow in frp's optional SSH Tunnel Gateway in versions 0.53.0 through 0.70.0 allows remote attackers to crash the frps process. TunnelServer.handleNewChannel adds four to an untrusted uint32 exec-command length, lets 0xFFFFFFFF wrap to three, and slices payload[4:3], causing an unrecovered panic. The gateway must be enabled; without an authorized-keys file, the request is processed before token validation and drops every active tunnel when frps exits.

CVSS severityUnavailable
Unscored
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in frp's optional SSH Tunnel Gateway in versions 0.53.0 through 0.70.0 allows remote attackers to crash the frps process. TunnelServer.handleNewChannel adds four to an untrusted uint32 exec-command length, lets 0xFFFFFFFF wrap to three, and slices payload[4:3], causing an unrecovered panic. The gateway must be enabled; without an authorized-keys file, the request is processed before token validation and drops every active tunnel when frps exits.

The record

CVE
CVE-2026-73564
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
fatedier
Product
frp
Classifications
CWE-190, CWE-129, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record 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=>= 0.53.0, < 0.70.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

fatedier · frpversion=>= 0.53.0, < 0.70.1

Published CVSS scores

No CVSS assessment is available in this record.

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 exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CWE-129Improper Validation of Array Index
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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