CVE-2023-38551Network attack vector

Browser script execution via CRLF injection

Published May 31, 2024 · Updated Mar 27, 2025

CRLF injection in Ivanti Connect Secure before 9.1R18.6, 22.5R2.2, or 22.7R2 allows remote authenticated users to cause browser XSS. Ivanti has not published the affected parameter or response-building operation that accepts unneutralized CRLF sequences. High-privileged administrative access is required, and successful injection runs attacker-controlled script in a victim’s browser.

CVSS severity8.2
High
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CRLF injection in Ivanti Connect Secure before 9.1R18.6, 22.5R2.2, or 22.7R2 allows remote authenticated users to cause browser XSS. Ivanti has not published the affected parameter or response-building operation that accepts unneutralized CRLF sequences. High-privileged administrative access is required, and successful injection runs attacker-controlled script in a victim’s browser.

The record

CVE
CVE-2023-38551
Published
May 31, 2024
Updated
Mar 27, 2025
Vendor
Ivanti
Product
Connect Secure
Classifications
CWE-93, T1189
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=22.5R2.2 <22.5R2.2
  2. Affected versionversion=22.7R2 <22.7R2
  3. Affected versionversion=9.1R18.6 <9.1R18.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Ivanti · Connect Secureversion=22.5R2.2 <22.5R2.2; version=22.7R2 <22.7R2; version=9.1R18.6 <9.1R18.6

Published CVSS scores

8.2HackerOne CNACVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
T1189Drive-by Compromise

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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