CVE-2026-5057Network attack vector

Unauthenticated denial of service via RpcProvider access

Published Jul 29, 2026 · Updated Jul 29, 2026

Missing authentication in RpcProvider in ATEN Unizon 2.6.253.001 allows remote attackers to interrupt service via network requests. The RpcProvider class exposes functionality without verifying a caller's identity, permitting unauthenticated invocation that makes the system unavailable. No account or user interaction is required; published details identify a denial-of-service condition but do not distinguish a hang, crash, or restart.

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

Missing authentication in RpcProvider in ATEN Unizon 2.6.253.001 allows remote attackers to interrupt service via network requests. The RpcProvider class exposes functionality without verifying a caller's identity, permitting unauthenticated invocation that makes the system unavailable. No account or user interaction is required; published details identify a denial-of-service condition but do not distinguish a hang, crash, or restart.

The record

CVE
CVE-2026-5057
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
ATEN
Product
ATEN Unizon
Classifications
CWE-306, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 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?

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  1. Affected versionversion=2.6.253.001

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ATEN · ATEN Unizonversion=2.6.253.001

Published CVSS scores

7.5Zero Day InitiativeCVSS:3.0/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-306Missing Authentication for Critical Function
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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