CVE-2023-46220Network attack vector

Unauthenticated SYSTEM code execution via stack buffer copy

Published Dec 19, 2023 · Updated Aug 2, 2024

Stack-based buffer overflow in Ivanti Avalanche before 6.4.2 allows remote attackers to execute arbitrary code via crafted packets. WLAvalancheService copies user-supplied data into a stack-based buffer without validating its length, corrupting memory. No authentication or user interaction is required, and successful exploitation runs code as SYSTEM or crashes the service.

CVSS severity9.8
Critical
EPSS probability11.34%
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 before 6.4.2 allows remote attackers to execute arbitrary code via crafted packets. WLAvalancheService copies user-supplied data into a stack-based buffer without validating its length, corrupting memory. No authentication or user interaction is required, and successful exploitation runs code as SYSTEM or crashes the service.

The record

CVE
CVE-2023-46220
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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8HackerOneCVSS: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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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