CVE-2023-28126Network attack vector

Authentication bypass via exposed GetSettings method

Published May 9, 2023 · Updated Jan 29, 2025

Authentication bypass in Ivanti Avalanche 6.3.x and earlier allows remote attackers to gain EnterpriseServer access through crafted messages. The GetSettings class exposes the SetUser method to unprivileged callers, while improper synchronization permits a race in authentication-message handling. The race is reachable without prior privileges, while the exposed-method route requires a low-privileged session; disclosed impact is unauthorized access.

CVSS severity5.9
Medium
EPSS probability66.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Ivanti Avalanche 6.3.x and earlier allows remote attackers to gain EnterpriseServer access through crafted messages. The GetSettings class exposes the SetUser method to unprivileged callers, while improper synchronization permits a race in authentication-message handling. The race is reachable without prior privileges, while the exposed-method route requires a low-privileged session; disclosed impact is unauthorized access.

The record

CVE
CVE-2023-28126
Published
May 9, 2023
Updated
Jan 29, 2025
Vendor
Ivanti
Product
Avalanche
Classifications
CWE-305, CWE-362, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 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=Avalanche versions 6.3.x and below

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ivanti · Avalancheversion=Avalanche versions 6.3.x and below

Published CVSS scores

8.8Trend Micro Zero Day InitiativeCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-305Authentication Bypass by Primary Weakness
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1190Exploit Public-Facing Application

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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