CVE-2023-46221Network attack vector

Remote code execution via unchecked stack-buffer copy

Published Dec 19, 2023 · Updated Aug 2, 2024

Stack-based buffer overflow in Ivanti Avalanche 6.x before 6.4.2 allows remote attackers to execute code through the Mobile Device Server. WLAvalancheService copies user-supplied packet data into a stack buffer without first validating its length. No authentication or user interaction is required, and successful exploitation runs arbitrary code as SYSTEM or crashes the service.

CVSS severity9.8
Critical
EPSS probability6.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Ivanti Avalanche 6.x before 6.4.2 allows remote attackers to execute code through the Mobile Device Server. WLAvalancheService copies user-supplied packet data into a stack buffer without first validating its length. No authentication or user interaction is required, and successful exploitation runs arbitrary code as SYSTEM or crashes the service.

The record

CVE
CVE-2023-46221
Published
Dec 19, 2023
Updated
Aug 2, 2024
Vendor
Ivanti
Product
Avalanche
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ivanti · AvalancheAffected versions are unavailable in this record.

Published CVSS scores

9.8HackerOne CNACVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-787Out-of-bounds Write
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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