CVE-2024-36136Public exploitNetwork attack vector

Unauthenticated service crash via off-by-one payload parsing

Published Aug 14, 2024 · Updated Aug 14, 2024

Off-by-one parsing in WLInfoRailService in Ivanti Avalanche 6.4.3.0 and earlier allows remote attackers to crash the service. The NameValue payload parser strips leading spaces while accepting a pointer equal to the byte beyond the buffer, so an all-space payload triggers an invalid memory read. Unauthenticated network access to TCP port 7225 is sufficient; exploitation terminates WLInfoRailService and interrupts interserver and database messaging.

CVSS severity7.5
High
EPSS probability2.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Off-by-one parsing in WLInfoRailService in Ivanti Avalanche 6.4.3.0 and earlier allows remote attackers to crash the service. The NameValue payload parser strips leading spaces while accepting a pointer equal to the byte beyond the buffer, so an all-space payload triggers an invalid memory read. Unauthenticated network access to TCP port 7225 is sufficient; exploitation terminates WLInfoRailService and interrupts interserver and database messaging.

The record

CVE
CVE-2024-36136
Published
Aug 14, 2024
Updated
Aug 14, 2024
Vendor
Ivanti
Product
Avalanche
Classifications
CWE-193, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.3.1 <6.4.4
  2. Affected versionversion=6.4.4 <6.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ivanti · Avalancheversion=6.3.1 <6.4.4; version=6.4.4 <6.4.4

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5HackerOneCVSS: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.

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 exploitPublished

Weakness, pattern, technique

CWE-193Off-by-one Error
T1499.004Application 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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