CVE-2024-22023Network attack vector

Temporary denial of service via XML expansion

Published Apr 4, 2024 · Updated Oct 3, 2024

XML entity expansion in Ivanti Connect Secure 9.x and 22.x and Policy Secure SAML allows remote attackers to cause a service interrupt. The SAML XML parser recursively expands entity references from a crafted request until CPU or memory resources are exhausted. No authentication or user interaction is required; the resulting denial of service is temporary and limited to availability.

CVSS severity5.3
Medium
EPSS probability3.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XML entity expansion in Ivanti Connect Secure 9.x and 22.x and Policy Secure SAML allows remote attackers to cause a service interrupt. The SAML XML parser recursively expands entity references from a crafted request until CPU or memory resources are exhausted. No authentication or user interaction is required; the resulting denial of service is temporary and limited to availability.

The record

CVE
CVE-2024-22023
Published
Apr 4, 2024
Updated
Oct 3, 2024
Vendor
Ivanti
Product
Connect Secure
Classifications
CWE-476, CWE-703, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 2024Record 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=22.1R6.2
  2. Affected versionversion=22.1R6.2 <22.1R6.2
  3. Affected versionversion=22.2R3
  4. Affected versionversion=22.2R4.2
  5. Affected versionversion=22.2R4.2 <22.2R4.2
  6. Affected versionversion=22.3R1.2
  7. Affected versionversion=22.3R1.2 <22.3R1.2
  8. Affected versionversion=22.4R1.2
  9. Affected versionversion=22.4R1.2 <22.4R1.2
  10. Affected versionversion=22.4R2.4
  11. Affected versionversion=22.4R2.4 <22.4R2.4
  12. Affected versionversion=22.5R1.3
  13. Affected versionversion=22.5R1.3 <22.5R1.3
  14. Affected versionversion=22.5R2.4
  15. Affected versionversion=22.5R2.4 <22.5R2.4
  16. Affected versionversion=22.6R1.2
  17. Affected versionversion=22.6R2.3
  18. Affected versionversion=22.6R2.3 <22.6R2.3
  19. Affected versionversion=9.1R14.6
  20. Affected versionversion=9.1R14.6 <9.1R14.6
  21. Affected versionversion=9.1R15.4
  22. Affected versionversion=9.1R15.4 <9.1R15.4
  23. Affected versionversion=9.1R16.4 <9.1R16.4
  24. Affected versionversion=9.1R17.4
  25. Affected versionversion=9.1R17.4 <9.1R17.4
  26. Affected versionversion=9.1R18.5
  27. Affected versionversion=9.1R18.5 <9.1R18.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ivanti · Connect Secureversion=22.1R6.2; version=22.1R6.2 <22.1R6.2; version=22.2R3; version=22.2R4.2; version=22.2R4.2 <22.2R4.2; version=22.3R1.2; version=22.3R1.2 <22.3R1.2; version=22.4R1.2; version=22.4R1.2 <22.4R1.2; version=22.4R2.4; version=22.4R2.4 <22.4R2.4; version=22.5R1.3; version=22.5R1.3 <22.5R1.3; version=22.5R2.4; version=22.5R2.4 <22.5R2.4; version=22.6R1.2; version=22.6R2.3; version=22.6R2.3 <22.6R2.3; version=9.1R14.6; version=9.1R14.6 <9.1R14.6; version=9.1R15.4; version=9.1R15.4 <9.1R15.4; version=9.1R16.4 <9.1R16.4; version=9.1R17.4; version=9.1R17.4 <9.1R17.4; version=9.1R18.5; version=9.1R18.5 <9.1R18.5
Ivanti · Policy Secureversion=22.4R1.2; version=22.4R1.2 <22.4R1.2; version=22.5R1.3; version=22.5R1.3 <22.5R1.3; version=22.6R1.2; version=22.6R1.2 <22.6R1.2; version=9.1R16.4; version=9.1R16.4 <9.1R16.4; version=9.1R17.4; version=9.1R17.4 <9.1R17.4; version=9.1R18.5; version=9.1R18.5 <9.1R18.5

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3HackerOneCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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-476NULL Pointer Dereference
CWE-703Improper Check or Handling of Exceptional Conditions
T1499.004Application or System Exploitation

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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